Home

- Siemens

1. 37 B 5 3 Time Overcurrent Calculations 38 List of Tables and Figures Table 1 Available Characteristics 5 Table 2 Controls and Indicators 7 Table 3 Configuration Mode Display Sequence 11 Table 4 List of Devices 12 Table 5 The Data Mode Display Sequence 14 Table C 1 Specifications sssenm 41 Figure 1 Relay Construction 1 0 2 Figure 2 Style Number Identification 4 Figure 3 Controls and Indicators 6 Figure 4 Outline Dimensions 18 Figure 5 Panel Drilling and Cutout Dimensions For Semi Flush 18 Figure 6 Relay Connections 19 Figure 7 Control Circuits 2 2 22 19 Figure 8 Single Phase Current Sensing 21 Figure 9 Three Phase Current Sensing 21 Figure 10 Three Phase with Residually Connected Ground Current Sensing Connections 22 Figure 11 Three Phase with Independent Ground Current Sensing Connections 41 22 B 5 4 High Low Range
2. nt AP Mode selection window Indicates the present Address of the relay Selected bAUd rate Phase time dial setting Ground time dial setting Phase tAP calibrate Ground tAP calibrate Phase instantaneous 1 Phase instantaneous 2 Ground instantaneous 1 Ground instantaneous 2 0001 to 0254 See text 0000 to 0099 0000 to 0099 0000 to 0099 0000 to 0099 00 75 to 020 0 00 75 to 020 0 00 75 to 020 0 00 75 to 020 0 Phase time overcurrent curve type b1 through c8 Ground time overcurrent curve type b1 through c8 Phase CT Primary Amps 5 through 5000 Phase CT SEcondary Amps 5 always Ground CT Primary Amps 5 through 5000 Ground CT SEcondary Amps 5 always Phase rAnge Ground rAnge demand Period HI or LO HI or LO 1 to 30 round trip Enable YES or no If 20 is YES the following options are provided Ground instantaneous trip 50 g YES or no Ground time trip 51 g YES or no If the relay includes the auxiliary output relay 20C is provided output relay to be tripped by the ground function in2 or tin1 breaker Failure enable YES or no Wraps to the top i e to the Mode selection window 20 permits option 1 2 to be configured as a dedicated ground trip output relay see Page 3 If this is desired select in2 if not select tinl 3 Operation by Front Panel Register 19 Demand Period Length dPrd Registers 14 and 16 the phase and ground secondaries are always 5 R
3. 38 B 5 5 Watchdog Circuitry eee 39 Bo UtDUES c n ei i RP EI prr peti ings ear ne PRA 39 6 1 General ec io ii 39 B 6 2 Relay Disabled 39 B 6 3 Instantaneous and Command Close 39 B 7 Target Indicators nette tenis 39 B 8 Communications Option 39 B 8 1 Local RS 232 40 B 8 2 Local or Remote with Siemens Power Monitor 40 B 8 3 Local or Remote by Owner s Computer 40 Appendix C Specifications 41 Figure 12 Two Phase with Residually Connected Ground Current Sensing Connections 23 Figure A 1 Timing Type b1 Short Inverse Time 28 Figure A 2 Timing Type b2 Long Inverse Time 28 Figure Timing Type b3 Definite Time 29 Figure A 4 Timing b4 Moderately Inverse 29 Figure A 5 Timing Type b5 Inverse Time 30 Figure A 6 Timing Type b6 Very Inverse Time 30 Figure A 7 Timing Type b7 Extremely Inverse 31 Figure 8 Timing Type b8 31 Figure A 9 Timing Type c1 with Limit 1 32 Figure A 10 Timing Type c2 with Limit 2 32 Figure A 11
4. b COMMAND ACTUATED CLOSE This selection is only available if the SCOR relay is equipped with a communica tions card Option 2 C This is used to permit remote closing of the circuit breaker A remote close signal may be transmitted over the communications link to initiate closure of this output relay if the breaker is open The relay contact must be wired into the circuit breaker close circuit in this application C Separate GROUND TRIP It is necessary in some tions to trip a separate lockout relay for ground faults This can be achieved by selecting Option 1 2 and configuring the relay to cause tripping through this separate relay contact for ground faults The ground tripping can be for operation of both the time and instantaneous elements but either can be configured to be disabled if desired Page 3 1 9 Communications Option 1 9 1 The Ports The communications interface a plug in board Option 2 C supports an RS 232 porton the front panel and an RS 485 port on the back of the relay s case These are also known by the designations 232 and EIA 485 Both ports have equal access to the relay s registers When connection is made to the RS 232 port the RS 485 port is disabled The RS 232 port is for relatively short range communication under 50 feet Its intended purposes are for initial configuration local testing and maintenance when the relay is not connected to a Power Monitor unit RS
5. and be mounted medium voltage or low voltage switch gear serving all circuit breakers within a substation or control room or it may be located remotely at a central maintenance control area The Power Monitor unit works intimately with SCOR relays to provide comprehensive displays monitoring and logging of all the data from all devices on the bus It is a dedicated computer which constantly monitors each device on the communications bus Every data item available from the front of the relay is also available atthe Power Monitor unit The Power Monitor unit also provides information not available on the SCOR display such as Page 40 system diagrams with real time amperes and circuit breaker position detailed data for all phases and ground simultaneously which changes to a trip log with time stamped currents at the time of trip relay target operation plus watchdog status a MIN MAX log and an event log with a time stamped chronological listing of events of all devices on the bus The event log is a powerful tool for operating and maintenance personnel Configuration ofthe S COR relay is read and stored by the Power Monitor unit and the relay can be configured or changed remotely from the Power Monitor unit except for the tap switches which must be set manually on the front panel Configuration and changes from the Power Monitor unit is password protected For complete operation of the SCOR relay with a Power Monitor
6. relay panel circuit breaker or control the relay is shipped in a sturdy carton to prevent damage during transit Immediately upon receipt of a relay check the style number against the requisition and packing list to see that they agree Visually inspect the relay for damage that may have occurred during shipment If there is evident damage immediately file a claim with the carrier and notify the Siemens Sales Office or contact Electrical Apparatus Division Customer Service In the event the relay is not to be installed immediately store the relay in its original shipping carton in a moisture and dust free environment When the relay is to be placed in service it is recommended that the verification tests given later in this section be performed prior to installation 4 2 Relay Operating Precautions Before installation or operation of the relay note the following precautions 1 Aminimum of 0 2 A in the output circuit is required to ensure operation of the FUNCTION targets 2 Always reset targets by means of the target reset switch 3 The relay is a solid state device and has been tested in accordance with the requirements defined below under DIELECTRIC TEST If a wiring insulation test is required on the panel assembly where this relay is to be installed it is suggested that the connecting plugs or paddles of the relay be removed and the cradle withdrawn from the case so as not to produce false readings during the wiring
7. unit see the Siemens Power Monitor Display and Monitoring Unit Manual No SG 4018 01 B 8 3 Local or Remote by Owner s Computer Installations which do not have a Power Monitor unit can use a computer equipped with Siemens Power Monitor PC program connected through a Siemens Isolated Multidrop RS 485 RS 232 converter If the SCOR relays and other devices are interconnected by the communication bus described above the computer can access all devices and display the same data as described for the Power Monitor unit This can be helpful when initially configuring a system which has multiple devices and for periodic downloading of event and MIN MAX data For information about operation with the Power Monitor PC referto the Siemens Power Monitor PC User s Guide Manual No 506 4028 Appendix Specifications Page 41 The SCOR relay is available in single phase three phase two phase with ground and three phase with ground configura tions and with the features and capabilities described in Table 1 Current Sensing Inputs Current Sensing Burden Frequency nominal Time Overcurrent Pickup Ranges Pickup Adjustment Pickup Setting Accuracy Pickup Repeatability Dropout Ratio Instantaneous Overcurrent Pickup Range Pickup Setting Accuracy Dropout Ratio Table C 1 Specifications The unit is designed to operate from the secondary of a standard current transformer rated at 5 A The maximum conti
8. 1 General Once installed and with its operating parameters established in internal memory the relay functions automatically to protect the system from overcurrent conditions Front panel operation of the relay permits configuring the registers that define the relay s automatic operation These parameters are entered into the relay s memory by using the controls and indicators that were introduced in the Controls and Indicators section and are further explained below The memory registers accessible from the front panel fall into two basic categories read only registers which are accessible when the relay is in the DATA mode the normal or working mode and the read write registers which may be accessed only when the relay is in the CONFiguration mode Note that allthe registers accessible atthe front panel plus many others that aren t are also accessible by remote computer and by local terminal For more information on controlling the SCOR relay from a remote computer see Section B 8 in Appendix B For information about controlling the S COR relay from a Siemens Power Monitor unit see the Siemens Power Monitor Display and Monitoring Unit Manual No SG 4018 01 3 2 The Configuration Mode 3 2 1 Defined Configuring the relay means loading the operating parameters into the relay s internal registers and setting the PHASE TAP and GROUND TAP switches The CONFiguration registers are ac cessible and alterable whenever the rela
9. Installation and Testing 17 1 9 2 5 44 4 40944 8 3 A T Genera hiat tiia e dh n it 17 1 10 Breaker Failure seem 4 4 2 Relay Operating Precautions 17 1 11 Style Number Figure 2 4 4 3 Dielectric 17 1 12 Time Overcurrent Characteristic Curves 5 At MORE a abaco 17 1 13 Instantaneous Overcurrent 4 5 5 17 Sone MEN MM 4 6 Verification Testing 20 2 Controls and Indicators 6 4 6 1 General etes sten 20 2 1 General decet cani a en erre 6 S c EE 20 3 Operation by Front Panel 10 AT Operational Test cc e eina nean ap CU nm 20 UR ENTE 10 4 7 1 Equipment Required 20 3 2 The Configuration 10 4 7 2 Preliminary Steps 40040 49 21 3 2 Defined 10 4 7 3 Time Overcurrent Pickup 21 3 2 2 Entering the Configuration Mode 10 4 7 4 Timing Test 23 3 2 3 Stepping Through the Read Write Registers 10 4 7 5 Instantaneous Overcurrent Pickup Test 24 3 2 4 Loading the Read Write Registers 10 4 7 6 Testing of Option 1 2 Comm
10. LED extinguishes should be between the pickup point from the table and 90 times the pickup point 5 Repeatsteps and 4 with the PHASE TAP switch set to B H and J successively LEGEND 51 OVERCURRENT RELAY 52 POWER CIRCUIT BREAKER Figure 10 Three Phase with Residually Connected Ground Current Sensing Connections If this is a single phase relay this completes the Time Overcurrent Pickup Test If this is a three phase relay perform steps 6 7 8 and 9 below If two phase with ground relay perform steps 6 7 10 and 11 below If three phase with ground perform all of the following steps 6 Disconnect the input current source from terminals 7 and 8 Phase A and connect it to terminals 14 and 15 Phase B 7 Repeat steps 2 through 5 above for Phase 8 Disconnectthe input current source from terminals 14 and 15 Phase B and connect it to terminals 17 and 18 Phase C 9 Repeat steps 2 through 5 above for Phase C 10 Disconnect the input current source from terminals 17 and 18 Phase C and connect it to terminals 13 and 16 Ground LEGEND 51 OVERCURRENT RELAY 11 Repeat steps 2 through 5 above for ground current 52 POWER CIRCUIT BREAKER Figure 11 Three Phase with Independent Ground Current Sensing Connections 4 Installation and Testing 4 7 4 Timing Test The timing characteristics available by programming the relay are
11. Power Monitor unit or a local terminal The tenth character ofthe style number is 0 ifthe control power for the power supply is DC However if 120 volt AC control power is to be used then this character must be 1 The last character is always S These relays are always supplied in a draw out case for semi flush mounting 1 12 Time Overcurrent Characteristic Curves Table 1 lists the types of Time Overcurrent Characteristic Curves available and the Number entered into the appropriate register during configuration The curves are presented in Figure A 1 through A 16 in Appendix A 1 13 Instantaneous Overcurrent Characteristic Curves The characteristic curves for the instantaneous relay functions are also presented in Appendix A Figure A 17 shows the curve for the Phase Instantaneous function and Figure A 18 shows the curve for the Ground Instantaneous function Table 1 Available Characteristics Time Overcurrent Characteristic Figure Short Inverse Time 1 Long Inverse Time A 2 Definite Time Moderately Inverse Time AA Inverse Time 5 Very Inverse Time A 6 Extremely Inverse Time A 7 8 FT wi 9 wi 10 wi A 11 FT wi A 12 PT wi A 13 PT wi A 14 wi A 15 A 16 33 PT wi 2 Controls and Indicators Page 6 2 1 General Figure 3 shows the front panel of the SCOR relay with the amperes The Time Target and Element B Target are shaded op
12. The second character of the style number determines the range for overcurrent pickup For example Sensing Input Tap Range 1 would provide a range of 2 0 to 11 0 A for each phase and a range of 0 5 to 5 0 A for ground current Normally open NO output contacts for tripping the breaker are standard so output Option E is the third character The fourth and fifth characters are Timing Option Z5 which is standard on the SCOR relay This feature allows the timing to be selected from any of the sixteen overcurrent timing functions illustrated in Figures A 1 through A 16 The sixth character represents the voltage of the source of operating power for the relay If J the internal power for the relay is derived from an external source of a nominal 125 VDC or 120 VAC Since only one target configuration is offered the seventh character is B Note that all ofthe FUNCTION targets are current operated Current operated targets are advantageous because they confirm that a current flowed in the output circuit as the result of a trip Since the ELEMENT targets are not associated with any output contacts they are internally operated If one instantaneous overcurrent element is needed the eighth character ofthe style numberis 1 If any one ofthe three features provided by Option 1 2 is desired the eighth character of the style number is 2 The ninth character must be C to specify the communications board option This would allow communica tion with a
13. a qualified person is one who is familiar with the installation construction or operation of the equipment and the hazards involved In addition he has the following qualifications is trained and authorized to de energize clear ground and tag circuits and equipment in accordance with established safety practices is trained in the proper care and use of protective equipment such as rubber gloves hard hat safety glasses or face shields flash clothing etc in accordance with established safety practices is trained in rendering first aid SUMMARY These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation operation or maintenance Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to the local sales office The contents of this instruction manual shall not become part of or modify any prior or existing agreement commitment or relationship The sales contract contains the entire obligation of Siemens Energy amp Automation Inc The warranty contained in the contract between the parties is the sole warranty of Siemens Energy amp Automation Inc Any statements contained herein do not create new warranties or modify the existing warranty Table of Contents 1 111111111114 1 3 2 11 Sel
14. are shown in Figure 6 and Figure 7 Incorrect wiring may result in damage to the relay Be sure to check the model and style number of the relay with the Style Number Identification Chart Figure 2 before connecting and energizing the relay The terminals along the top and bottom of the back ofthe case are suitable for use with wiring terminals and wire sizes of 14 AWG or larger The RS 485 port terminals A B and C back of case center require a shielded twisted pair Be sure the relay case is hard wired to earth ground with no smaller than 12 AWG copper wire A ground terminal on the rear ofthe case is provided forthis purpose Ideally each relay should have a separate ground wire to the ground bus If this is not practical the number of relays sharing a ground wire should be kept to a minimum The connections to the current transformers are shown in Figures 8through 12 Diagrams are presented for single phase two phase and three phase operation 4 Installation and Testing Page 18 Screws O FRONT VIEW 10 32 Screws Mounting Panel SIDE VIEW 3 03 770 6 06 ov yY 6 35 DIA 4 PLACES 154 0 MOUNT RELAY USING 4 10 SCREWS DIMENSIONS IN INCHES AND CENTIMETERS Figure 5 Panel Drilling and Cutout Dimensions F
15. axes without structural damage or degradation of performance In standard tests the relay has withstood 2 g in each of three mutually perpendicular axes swept over the range of 10 to 500 Hz for a total of six sweeps 15 minutes each sweep without structural damage or degradation of performance 1500 VAC at 60 Hz for one minute in accordance with IEC 255 5 and ANSI IEEE C37 90 1989 Dielectric Test Qualified to ANSI IEEE C37 90 1 1989 Standard Surge Withstand Capability Test and Fast Transient Test and IEC 255 5 Impulse Test and Dielectric Test Maintains proper operation when tested in accordance with ANSI IEEE C37 90 2 1987 40 to 70 C 40 to 158 65 to 100 C 85 to 212 F 14 8 pounds net 51 Dimensions are given in Figure 4 UL ra go gt 7 gt Table 2 Power Supplies Nominal Input Input Voltage Voltage Range 48 VDC 24 to 60 VDC 125 VDC 62 to 150 VDC 120 VAC 90 to 132 VAC Specifications Table C 3 Current Sensing Burden R and L R in milliohms L in microhenries RANGE 1 x TAP LOW 12 37 2 46 11 86 2 36 11 53 2 30 11 33 2 25 10 94 5 54 10 71 5 41 10 88 5 52 10 87 5 49 10 84 5 49 10 83 5 49 HIGH 5 78 1 14 5 70 1 14 5 66 1 14 5 69 1 14 5 68 1 14 5 59 1 11 5 60 1 11 5 61 1 11 5 61 1 11 5 63 1 11 Exceeds maximum continuous current 2 x TAP 11 6
16. connect itto terminals 17 and 18 Phase C 11 Repeat steps 2 through 7 above for phase C 12 Disconnectthe input current source from terminals 17 and 18 Phase C and connect it to terminals 13 and 16 Ground 13 Repeat steps 2 through 7 above for ground 4 7 6 Testing of Option 1 2 Command Close Function This function can only be used and tested if the Communica tions Option is present and a Power Monitor unit or Power Monitor PC unit is present 1 Close the 52b contact input on the relay terminals 3 and 9 which simulates the open breaker 2 Select the Command Close command in the Power Monitor For detailed instructions refer to the Siemens Power Monitor Display and Monitoring Unit Manual SG 4018 01 You should observe the closure of the programmable output contact terminals 5 and 6 4 Open the 52b contact input You should observe the programmable output contact open 5 Repeat step 2 Terminals 5 and 6 should not close 5 Maintenance Page 25 5 1 General Static devices require no preventive maintenance other than a periodic operational test see Page 20 If the relay fails to function properly contact Siemens Customer Service When returning the relay to the factory ship the entire relay cradle assembly preferably in its case 5 2 Storage This protective relay contains aluminum electrolytic capacitors which generally have a storage life expectancy in excess of ten years at storage
17. illustrated in Figures A 1 through A 16 Output trip should occur as shown for any given TIME DIAL setting to within 10 or 20 milliseconds whichever is greater Verification of timing accuracy can be limited to low current levels for convenience Verify timing accuracy as follows 1 After performing the Preliminary Steps Page 19 con nect the input current source to terminals 7 and 8 on the relay case Phase A Select the time overcurrent characteristic of choice by entering its identifying code number into the Phase curve Pcur register Reference Table 3 Similarly load the Ground curve register with the characteristic of choice if ground current monitoring is a relay option Set the PHASE TAP switch to position A Load 99 into the Time Dial register The Phase tAP calibrate register is still at the 00 setting given in Preliminary Steps Measure the timing from the application of input current to output contact closure for currents that are adjusted to the following multiples of TAP a 2 0 x TAP and b 5 0 x TAP Check the results against the graphed values Adjust the TIME DIAL to 20 and repeat step 4 If this is a single phase relay this concludes a minimal Timing Test Other TAP switch positions may be tried within the limitations of the current source If this is a three phase relay with ground perform the following steps 10 11 23 LEGEND 51 O
18. of the sequence described in Table 5 In the event of a malfunction the Error Code register can narrow the search for possible causes When this register is at0000 there is no error message If not at0000 advise the Siemens Customer Service representative of the reading The relay will probably require repair at the factory Table 5 The Data Mode Display Sequence Display Sequence Display Abbreviation dHEH h H h b Ph c bnd PhAJ Phbd 2 3 4 5 6 7 8 9 dHEH Register Register Function Range Mode selection window Phase A kiloamperes Phase b kiloamperes Phase c kiloamperes Ground kiloamperes Phase A demand kiloamperes Phase b demand kiloamperes Phase c demand kiloamperes Error code see text below Wraps to the top i e to the Mode selection window 3 Operation by Front Panel 3 4 Setting the Relay Example 3 4 1 Example Defined This hypothetical example has the following requirements Parameter For Phase For Ground Time overcurrent 1 6 pickup Pickup Range High Low Curve shape Very Inverse Inverse Time delay setting 0 38 sec 6 0 37 sec 6 pickup x pickup Instantaneous 14 4A 6 4A overcurrent pickup The following style number describes an appropriate relay for this hypothetical application Model SCOR Style H1E 75 B1NOS The second style digit indicates that HIGH range was chosen for phase monitoring and LOW range for ground cur
19. reset the timing process is terminated The TMG LED extinguishes at reset but remains on at trip as an indication of contact closure If a relay output is closed it is immediately reset when the monitored current drops below the pickup setting Targets however remain tripped until manually reset at the front panel Control power is required to reset the targets 1 4 RMS Sensing The SCOR protective relay uses RMS Sensing a technology first introduced by Siemens in 1985 to sample the current wave shape and quickly calculate the effective heating value of the current SCOR relays evaluate the impact of harmonics and provide accurate circuit protection The SCOR relay uses a sum of squares algorithm for both determining trip level and for calculating metered values of the relay current level The input waveform is sampled several times to determine instantaneous values These instantaneous values are processed to obtain the true RMS value of the input current 1 General Information Page 2 Figure 1 Relay Construction 1 5 The Instantaneous Overcurrent Function Option 1 1 One or two instantaneous overcurrent outputs are available Options 1 1 and 1 2 Normally one is selected The instanta neous pickup point is adjustable from 0 50 times to 20 times the time overcurrent tap setting When the sensed input current exceeds an instantaneous overcurrent pickup setting an in stantaneous output relay is energized Also a targe
20. temperatures less than 40 C Typically the life expectancy of the capacitor is cut in half for every 10 C rise in temperature Storage life can be extended if at one year intervals power is applied to the relay fora period of 30 minutes 5 3 Timekeeping The real time clock within the relay once set by the Power Monitor unit after power up maintains time to a resolution of 0 01 second however drift within the clock can be as much as 0 5 seconds per day In order to keep all of the clocks in the system in proper synchronization the Power Monitor periodically broad casts the correct time Note that changing the time within a relay by seconds or minutes can upset instrumentation functions such as demand calcula tions 6 References EIA Standard 485 Also known as the RS 485 Stan dard Published by Electronic Industries Association April 1983 Siemens Power Monitor Display and Monitoring Unit Manual No SG 4018 01 Siemens SCOR Protocol Siemens Isolated Multi Drop RS 232 to RS 485 Con verter Manual No SG 6048 Page 26 Siemens Power Monitor PC User s Guide Manual No 56 4028 Siemens SIEServe Electrical Distribution Communication Software User s Manual Manual No SG 6058 Siemens WinPM Power Monitoring and Control for Win dows User s Manual Manual No SG 6118 Siemens PC32F Power Monitor Data Sheet Bulletin No 56 3211 Appendix A Time Overcurrent Characteristic Curves
21. 485 port provides for intercommunication between the relay and a Siemens Power Monitor unit or a computer running the Power Monitor PC software WinPM power monitoring and control software or SIEServe software Communication is provided over a shielded twisted pair cable at distances of up to 4000 feet This feature allows configuration measurement and protection functions to be performed or reviewed from a remote location 1 9 2 Communications The data and configuration capability of the communications link includes Real time data for amperes each phase and ground and amperes demand each phase The monitored cur rent is expressed in primary kiloamperes CT ratio monitored relay Relay status normal timing tripped and breaker posi tion open closed Event record with amperes prior to trip time stamp element which caused trip and fault accumulation Trip log including status changes RMS current and time stamp The last 20 events are stored in the relay s nonvola tile memory 1 General Information Page 4 Style Number Identification Chart for Siemens SCOR Relay ae SENSING INPUT TYPE OUTPUT POWER SUPPLY OPTION 1 OPTION 3 K Single Phase Current 2 G Three Phase Current 2 E Contacts 48 Vdc J 125 Vdc 120 Vac 0 None 1 Power Supply Ho
22. 6 2 33 11 29 Q 25 11 10 Q 20 10 82 5 46 10 69 5 41 10 86 5 49 10 70 5 41 10 70 5 41 10 69 5 41 10 69 5 41 5 50 2 79 5 57 1 11 5 49 1 09 5 50 1 09 5 52 1 11 5 54 1 11 5 56 1 11 5 56 1 11 5 x TAP 11 17 Q 22 10 97 Q 18 10 71 5 41 10 87 5 46 11 57 5 86 10 70 5 41 10 69 5 41 10 64 5 38 10 66 5 38 10 67 5 41 5 61 1 11 5 58 1 11 Page 44 SIEMENS Siemens Energy amp Automation Inc Switchgear and Motor Control Business P O Box 29503 Raleigh NC 27626 0503 Manual SG 9228 02 Replaces SG 9228 01 M 0195xx Printed in U S A 1995 Siemens Energy amp Automation Inc SIEMENS is a registered trademark of Siemens AG
23. Monitoring Unit Manual 56 4018 01 3 2 8 Setting the Time Dial There are two Time Dial registers one for the phases one for ground the 3rd and 4th registers respectively in the stepping sequence Some relays do not monitor the ground current Check the style number The Time Dial registers may contain any integer from 0 to 99 Each integer designates one of the hundred characteristic curves available for each overcurrent function as illustrated in Figures A 1 through A 16 3 2 9 Setting Tap Calibration The Tap Cal registers 5th and 6th of the sequence listed in Table 3 may hold any integer from 0 to 99 Each integer represents a one percent increment between adjacent taps Refer to the example at the end of this section to calculate the required integer 3 2 10 Setting Instantaneous Overcurrent Pickup The 1 and pin2 registers 7th and 8th ofthe CONFiguration sequence hold the phase trip values for the INST 1 and the INST 2 output contacts These instantaneous overcurrent registers may contain any number in the range 0 50 to 20 representing 0 50 to 20 times the phase TAP position Ground current instantaneous trip values are similarly entered as multiples of the GROUND TAP position into registers 1 and nin2 9th and 10th of the configuration sequence for the INST 1 and INST 2 contacts 3 2 11 Selecting the Time Overcurrent Characteristic The time overcurrent curve type registe
24. ONTACTS 52 TC BREAKER TRIP COIL TRIP BUS Figure 7 Control Circuits 4 Installation and Testing 4 6 Verification Testing 4 6 1 General The various test procedures which follow are intended to verify operation of the relay and to set the various controls for a specific application Each phase of a two or three phase relay may be tested as a single phase device using the procedures given Check the Style Number Identification Chart Figure 2 with the style number of the relay to identify the options included within the specific relay to be tested All LED and target indicators should be checked in the course of carrying out these test procedures Reminder The FUNC TION targets require at least 0 2 A in the output circuit to operate When test results do not fall within the specified tolerances the following should be evaluated 1 The tolerances of the test equipment 2 Cycle to cycle phase stability of the test equipment 3 Thetolerances of any external components used in the test setup 4 6 2 Scope A complete checkout of the relay or verification test confirms that the following are within the published specifications 1 Time overcurrent pickup 2 Instantaneous pickup 3 Time overcurrent timing 4 Communications option The testing procedure for this option is covered in Siemens Power Monitor Display and M
25. SIEMENS SCOR Overcurrent eee Operation rotective Relay Maintenance Hardware 3 11 Software 3 40 SIEMENS SCOR Style H1E Z5J B1COS Function Data 17 Li 11 2 Function Time Inst 1 Manual No SG 9228 02 A DANGER Electrical equipment contains hazardous voltages and high speed moving parts Will cause death serious personal injury or equipment damage Always de energize and ground the equipment before maintenance Maintenance should be performed only by qualified personnel The use of unauthorized parts in the repair of the equipment or tampering by unqualified personnel will result in dangerous conditions which will Cause severe personal injury or equipment damage Follow all safety instructions contained herein IMPORTANT The information contained herein is general in nature and not intended for specific application purposes It does not relieve the user of responsibility to use sound practices in application installation operation and mainte nance of the equipment purchased Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations Should a conflict arise between the general information contained in this publication and the contents of drawings or supplementary material or both the latter shall take prece dence QUALIFIED PERSON For the purpose of this manual
26. Timing Type c3 with Limit 3 33 Figure A 12 Timing Type c4 with Limit 4 33 Figure A 13 Timing Type c5 with Limit 5 34 Figure A 14 Timing Type with Limit 34 Figure A 15 Timing Type c7 with Limit 7 35 Figure A 16 Timing Type c8 with Limit 8 35 Figure A 17 SCOR Instantaneous Time Curve Phase TIMINGS 2 ure Car ens 36 Figure A 18 SCOR Instantaneous Time Curve Ground 5 36 Figure B 1 Functional Block Diagram 38 1 General Information Page 1 1 1 Description The Siemens Communicating Overcurrent Relay SCOR is a microprocessor based time overcurrent relay designed for easy incorporation into a computer monitored power system It is available in a number of styles to supply single phase two phase with ground three phase and three phase with ground protection for 60 Hz power systems The relay provides for the incorporation of an optional plug in communications board to interface with the Siemens Power Monitor display and monitoring unit and the Siemens AC CESS system The communications interface when fully implemented allows remote monitoring of real time system and circuit breaker information and the transmission of event and historical data as well as remote configuration of operating parameters 1 2 Ap
27. VERCURRENT RELAY 52 POWER CIRCUIT BREAKER Figure 12 Two Phase with Residually Connected Ground Current Sensing Connections Disconnect the input current source from terminals 7 and 8 Phase A and connect it to terminals 14 and 15 Phase B Repeat steps 2 through 5 above for Phase B Disconnect the input current source from terminals 14 and 15 Phase B and connect it to terminals 17 and 18 Phase C Repeat steps 2 through 5 above for Phase C Disconnect the input current source from terminals 17 and 18 Phase C and connect it to terminals 13 and 16 Ground Repeat steps 2 through 5 above for ground current 4 Installation and Testing 4 7 5 Instantaneous Overcurrent Pickup Test The phase current pickup of the relay will be set at the factory to operate on one of the two available ranges HIGH or LOW If ground current is monitored it will also be set for one of the two ranges Determine which range your relay is set for by the indication of the tap range on the front panel One for phase and one for ground When testing the instantaneous element the thermal rating of the relay must not be exceeded The maxi mum continuous current rating for each input is five times tap or 20 A whichever is less The one second current rating for each input is 50 times tap or 500 A whichever is less For ratings at less than one second refer to formula on Page 41 Verify instantaneous overcurrent pickup as follows 1 A
28. XT switch repeatedly until ConF is displayed on the front panel display Then hold the switch up for approximately five seconds until the word dAtA appears At this time the STATUS LED will extinguish Releasing the MODE switch before five seconds has expired will return the display to the CONFiguration mode 3 3 3 Scrolling When the display is left at dAtA for 60 seconds the display will automatically step through all of the read only registers will scroll in the sequence of Table 5 then wrap around and repeat This scrolling process first presents the name ofthe next register of the sequence for 0 4 seconds then presents the data of that register for 0 4 seconds This process will repeat 3 Operation by Front Panel endlessly while the relay remains in the DATA mode unless deliberately halted as described below To stop the display ata particular register step the display to the desired read only register using the NEXT switch The registers will appear in the sequence of Table 5 Raising the MODE NEXT switch above center displays the name of the register arrived at and this register will be displayed until manually advanced except when dAtA is displayed Holding the MODE switch up for five seconds or more when the word dAtA is displayed puts the relay into the CONFiguration mode Leaving the display at dAtA for 60 seconds will cause it to scroll again 3 3 4 Instrumentation Displ
29. addressed all of the relay s storage registers may be read by the Power Monitor unit and many of them can be altered Password protected 1 10 Breaker Failure When the relay includes the Communications Option a Breaker Failure feature is provided This functions to signal if the circuit breaker does not open immediately after operation of a time and or instantaneous output relay The breaker failure function involves a 1 second timer When a trip occurs the timer starts At time out two checks are made one that the breaker properly changed state opened and two that the current is below approximately 10 of the tap value If the result of either check is not correct then it is assumed that the circuit breaker has failed to open and or failed to interrupt the current If a breaker failure is detected a time stamped message Breaker Failure is sent to the Power Monitor unit Event Log This feature may be disabled at Display Sequence 21 of the Configuration Menu see Page 11 1 11 Style Number Figure 2 The style number of the relay determines the features to be included or ordered for a particular application Each available option is represented by a character as shown in Figure 2 Style Number Identification Chart 1 General Information 5 For example if it is decided that three phase with ground monitoring is required for an application then the first character of the style number is H
30. and Close Function 24 3 2 5 Programming 10 5 Maintenance nnns 25 3 2 6 Programming the Address 12 5 1 General E ARA AEN 25 3 2 7 Setting the Baud Rate ciet 12 BOS tide ara nc do 25 3 2 8 Setting the Time Dial 13 5 3 Timekeeping tton 25 3 2 9 Setting Tap Calibration 13 6 0 26 3 2 10 Setting Instantaneous Overcurrent Pickup 13 Copyright 1995 Siemens Energy amp Automation Inc SIEMENS is a registered trademark of Siemens AG ACCESS SlEServe WinPM Power Monitor Power Monitor PC and Isolated Multi Drop are trademarks of Siemens Energy amp Automation Inc Table of Contents Appendix A Time Overcurrent Characteristic Curves 27 Appendix B Functional Description of Operation 37 B 1 General ect cte ee rd 37 B 2 Current 51 37 B 3 Power Supply 37 37 ie Malate 37 B 3 2 Loss of Power Sensing 37 B 4 37 B 5 Internal Microcomputer 37 B 5 1 Analog to Digital 37 B 5 2
31. ay The first seven registers of the Data Mode Display Sequence Table 5 comprise the instrumentation display The first four registers indicate the current at the CT primaries of each phase in kiloamperes Registers 5 6 and 7 of the sequence indicate the demand current at the primaries in kiloamperes The Demand Registers show average kiloampere demand for each monitored phase over a time period that is set into the Demand Period register The latter is not accessible from the front panel display The displayed average is recalculated each Page 14 minute for each phase by adding the Demand Period samplings which have accumulated for a given phase then dividing this sum by the Demand Period number to obtain the average demand value The latter is then displayed in the Demand Current register for the appropriate phase The demand current values may also be read over the data link Allofthe instrumentation registers registers 1 through 7 display their data in real time Note that if the amperes are over or under the operational scale of the ammeter the display will show a row of four dashes The position of these dashes high or low indicate which way the parameter is out of range If current is below the 10 of TAP level the row of dashes along the bottom of the display If currentis above 150 of TAP the row of dashes are along the top of the display 3 3 5 Error Code The error code display is the last register
32. ces be made with the information shown in Table 4 3 2 7 Setting the Baud Rate Using the procedures described above for entering the CONFiguration mode display bAUd by advancing to the second register Reference Table 3 The baud rate may now be adjusted by raising or depressing the UP DOWN switch as required Page 12 Table 4 List of Devices New Device Serial Circuit Address Location Address Type Number Name in Swgr Date SCOR 325 Main 1 223 Cell 1B 4700 2092 Main 1 323 Cell 1B SCOR 333 Feeder 1 224 Cell 2A 4700 2105 Feeder 1 324 Cell 2A Use key assignment A to change an address The baud rates available and their sequence are listed below Note that the displayed value requires a multiplier of 1000 to arrive at the actual rate Baud Rate Displayed Value 19 200 19 20 9 600 9 600 4 800 4 800 standard for Power Monitor 2 400 2 400 1 200 1 200 600 0 600 300 0 300 The next advance wraps to 19 20 The selected baud rate is loaded into the relay s nonvolatile memory with the return to DATA mode The message P EE will appear briefly on the display to indicate that the new data is stored in nonvolatile memory NOTE The Power Monitor System uses a baud rate of 4800 3 Operation by Front Panel IMPORTANT NOTE Ifthe installation is equipped with a Power Monitor unit the remaining registers can be more easily configured using the Power Monitor unit Referto Siemens Power Monitor Display and
33. d up Magnetically latched indicators that change from black to orange when tripping occurs to indicate the phase A B or C or ground N that caused the trip Depending on the relay s style number some of these targets may not be present Reset by Target Reset Switch M Defines the settings of the TAP switches locators A and G Magnetically latched indicators that change from black to orange when a relay output has tripped Note that the current through the associated output contact must exceed 0 2 A to actuate the target For reset see Depending upon the style number some of the illustrated targets may not be present Indicates that a trip was caused by a TIME overcurrent function INST 1 Indicates a trip initiated by the INSTantaneous 1 function Only provided if Option 1 2 is selected Indicates a trip initiated by the INSTantaneous 2 function or that a CLOSE contact output was initiated by an external computer controlled command or that a ground trip occurred Momentary pushbuttons that provide the means to test the functioning of the output contacts without having to apply current to the sensing inputs Buttons are depressed by inserting a 1 8 diameter non conducting rod through holes in the front panel Closes the INSTantaneous 2 or the CLOSE output contact depending upon the option present Closes the Instantaneous 1 output contact Closes the Timed Trip output contact 3 Operation by Front Panel 3
34. ecting the Time Overcurrent e Characteristic enn 13 LT Description oet 1 T 3 2 12 Selecting the CT Ratios 13 1 2 0 nnn 1 3213C 5 1 3 The Time Overcurrent 1 E ee R 3 2 14 Demand 13 1 33 PICKUP A 1 Am 3 3 The DATA 13 T32 1 4 3 3 2 Defined be 13 1 3 3 Trip and 1 3 3 2 Entering the DATA Mod 13 1 4 RMS Sensing 1 ae n gS B To The netantaneois Overcurrent F netisi 3 3 Scrolling RE e Option 1 1 i5 nie ec rim ented 2 3 3 4 Instrumentation 15 14 1 6 The Ground Time Overcurrent and 3 3 5 Error Code c eene 14 Instantaneous Functions 2 3 4 Setting the Relay Example 15 1 7 Ground Trip Selectivity 2 3 4 1 Example 15 1 8 Auxiliary Output Relay Option 1 2 3 3 4 2 Calculating the Settings 15 1 9 Communications Option serene 3 3 4 3 Entering the 05 00 222 4 0007 44 1 15 LSI The P ONS i e nee eee tative eei nre 3 4
35. egisters 17 and 18 the Tap Ranges are pre programmed based on the style number ordered Registers 7 8 9 and 10 the Instantaneous 1 and 2 Functions are options only supplied when ordered Thus you normally only need to program registers 3 through 12 in the field These are the protective settings The values are established by a time current coordination study You may also need to make the choices for registers 19 20 and 21 Values which have been entered can be viewed by entering the CONFiguration mode and scrolling through all items 3 2 6 Programming the Address Skip this item if the relay is not equipped with the communi cations option Enter the configuration mode described above and advance to the Addr register by depressing and releasing the NEXT switch The SCOR unit address is displayed This number which ranges from 1 to 254 is a unique address used for communicating to this SCOR via its RS 485 port on the back of the case The number must be selected such that it is unique among all devices connected on the same RS 485 loop multiple devices may be daisy chained together on a single communication bus When configuring the SCOR to communicate to a Si emens Power Monitor unit the address will be used to identify the particular SCOR Relays initially are configured with the address 222 If this has not been changed it must be done prior to accessing from the Power Monitor unit It is suggested that a list of devi
36. elay Disabled output contact closes as explained below under Outputs B 4 Multiplexer A multiplexer is utilized to select each current sensing input These inputs are then supplied to the sample and hold circuit and then to the level shifter The level of each input sample is strobed into the microprocessor where analog to digital con version is implemented B 5 Internal Microcomputer The onboard computer fulfills many of the logic and signal processing functions described in the following paragraphs and performs the time delay computations B 5 1 Analog to Digital Converter The voltage representing a component of the actual sensed current is presented to the analog to digital A D converter The A D converter supplies the equivalent binary value of the sensed current The accumulator stores a number of these squared samples and presents this sum to the trip computer The microcomputer then calculates the true RMS value ofthe current at each input B 5 2 RMS Sensing The SCOR protective relay uses RMS Sensing a technology first introduced by Siemens in 1985 to sample the current wave shape and quickly calculate the effective heating value of the current SCOR relays evaluate the impact of harmonics and provide accurate circuit protection The SCOR relay uses a sum Appendix Functional Description of Operation Page 38 of squares algorithm for both determining trip level and for calculating metered values of
37. erating power at terminals 3 and 4 Verify that the POWER LED is lit and that the relay disabled contact is open 4 Load 00 into the Phase Tap Cal register 5 Load 99 into the Time Dial register 4 7 3 Time Overcurrent Pickup Test The phase current pickup of the relay will be set at the factory to operate on one ofthe two available ranges HIGH or LOW If ground current is monitored it will also be set for one of the two ranges Determine which range applies by noting the indication of the tap range on the front panel One for phase and one for ground Page 21 LEGEND 51 OVERCURRENT RELAY 52 POWER CIRCUIT BREAKER Figure 8 Single Phase Current Sensing Connections LEGEND 51 OVERCURRENT RELAY 52 POWER CIRCUIT BREAKER Figure 9 Three Phase Current Sensing Connections 4 Installation and Testing Page 22 4 7 3 Time Overcurrent Pickup Test Continued Verify time overcurrent pickup as follows 1 After performing the above preliminary steps connect the input current source to terminals 7 and 8 on the relay case Phase A 2 Set the PHASE TAP switch to position A 3 Adjust the input current source to 110 of the value shown on the front panel table for TAP A HIGH or LOW range as indicated by the second digit of the style number Observe that the PHASE A TMG LED illuminates 4 Adjust the current source so that the PHASE A TMG LED goes dark The current applied when the
38. ercurrent Characteristic Curves page Figure A 11 Timing Type c3 w Limit 3 Figure A 12 Timing Type c4 T w Limit 4 Dwg No 18 752 294 011 Dwg No 18 752 294 012 Appendix Time Overcurrent Characteristic Curves page 34 Figure A 13 Timing Type c5 w Limit 5 Figure A 14 Timing Type w Limit 6 Dwg No 18 752 294 013 Dwg No 18 752 294 014 Appendix Time Overcurrent Characteristic Curves 35 Figure A 15 Timing Type c7 T w Limit 7 Figure A 16 Timing Type c8 T w Limit 8 Dwg No 18 752 294 015 Dwg No 18 752 294 016 Appendix A Time Overcurrent Characteristic Curves page SCOR INSTANTANEOUS TIME CURVE PHASE TIMINGS e a Q e zi gt gt lt gt 51 SCOR 0992 007 1 22 92 6 8 10 12 14 MULTIPLE TAP Figure A 17 SCOR Instantaneous Time Curve Phase Timings SCOR INSTANTANEOUS TIME CURVE GROUND TIMINGS 51 SCOR D992 007 1 22 92 6 8 10 12 14 MULTIPLE OF TAP Figure A 18 SCOR Instantaneous Time Curve Ground Timings Appendix Functional Description of Operation B 1 General The SCOR relay is a microprocessor based overcurrent
39. eset switch on the front of the relay or its extension bar that protrudes through the bottom ofthe cover The relay must be under power to reset a target NOTE Resetting the targets in this manner will not reset the alarm messages provided on the communication link B 8 Communications Option The SCOR relay includes provision for the future addition of the optional communication board as standard If the communica tions option 2 C is selected initially the relay is provided with an RS 232 portonthe front panel and an RS 485 portonthe back of the case Appendix Functional Description of Operation B 8 1 Local RS 232 Port A 9 RS 232 communication port is provided on the front of the relay for local data readout and programming when the communication option is installed Use of this port is restricted to Siemens field service and factory personnel and connection to this port automatically disables remote RS 485 communications B 8 2 Local or Remote with Siemens Power Monitor Unit The RS 485 port permits interconnecting multiple SCOR relays 4700 power meters Static Trip trip units and other compat ible devices via an industry standard shielded twisted pair EIA RS 485 communication bus to a Siemens Power Monitor display and monitoring unit A Power Monitor unit can accom modate up to 64 devices The bus length can be up to 4000 feet The Power Monitor unit is intended to be a factory floor tool
40. fter performing the Preliminary Steps Page 19 con nect the input current source to terminals 7 and 8 on the relay case Phase A 2 Load 50 into the Phase Instantaneous 1 register Ap pears as 1 in the display and in Table 3 on Page 11 3 Setthe PHASE TAP switch to position A 4 Starting from 0 A slowly increase the input current source until the INST 1 output contact closes This should occur at 0 5 the value shown on the front panel table for TAP A 5 Adjustthe current source so that the INST 1 relay opens The current applied should be above 71 2596 of the TAP value reference the front panel table 6 Repeat steps 3 through 5 above with the PHASE TAP switch set to B C D successively 7 If Option 1 2 is present and is used as Inst 2 follow the procedures of steps 2 through 6 for testing the Instanta neous 2 pickup and output Page 24 If this is a single phase relay this completes the Instantaneous Overcurrent Pickup Test If this is a three phase relay perform steps 8 through 12 below If a two phase with ground relay perform steps 8 9 12 and 13 If three phase with ground perform all of the following steps 8 Disconnect the input current source from terminals 7 and 8 Phase and connect it to terminals 14 and 15 Phase B 9 Repeat steps 2 through 7 above for Phase B 10 Disconnectthe input current source from terminals 14 and 15 Phase B and
41. function without human input B 6 Outputs B 6 1 General Although the output relays are controlled by the microcomputer the output interface contains the transistors that energize them With the exception of the Relay Disabled contact described below all of the output contacts are of the normally open type and have targets associated with them B 6 2 Relay Disabled Output The Relay Disabled output contactis of the normally closed type It is held open by the output relay s energized coil at all times after power up unless a malfunction is detected as noted below This arrangement provides for a fail safe output signal since the contact is able to close an external alarm circuit even in the absence of power The Relay Disabled output contact will close if 1 The power supply voltage falls below requirements or 2 The upper connecting plug paddle is removed Additionally the Relay Disabled output contact will momentarily close if the watchdog circuit detects abnormal operation of the computer Actually detection of abnormal operation leads to microcomputer reset in an effort to correct the problem and the reset operation causes the contact closure B 6 3 Instantaneous and Command Close Options One or two instantaneous outputs are available as options The trip points for these options are selected by a programming method described in Section 3 Operation by Front Panel When two instantaneous outpu
42. hrough 12 1 7 Ground Trip Selectivity This standard feature of the SCOR relay allows the ground element to be enabled or disabled on the timed and INST 1 output 1 General Information Some applications require that the instantaneous element be active for phase but not for ground and vice versa Other applications may require instantaneous tripping with no time overcurrent function When the time or instantaneous function is not desired this may be achieved by disabling either when configuring the relay at Display Sequence 20 of the Configura tion Menu see Page 11 For some applications the ground element may be present but not desired It may be disabled completely at Display Sequence 20 of the Configuration Menu see Page 11 Alternatively ground trip functions can be shifted to the auxiliary output relay if this option is installed This option is configured at Display Sequence 20 of the Configuration Menu see Page 11 1 8 Auxiliary Output Relay Option 1 2 This option includes an additional target identified as INST 2 CLOSE The option can be used in any one of three ways a INST 2 This provides a second instantaneous trip contact which can be set independently of INST 1 and the contact can be used in a different circuit This is for application in reclosing schemes to block reclosing for high magnitude faults It can also be used to block tripping of an interrupting device above its interrupting rating
43. insulation test 4 When the connecting plugs are removed the relay is disconnected from the operating circuit and will not provide system protection Always be sure that external operating monitored conditions are stable before removing a relay for inspection test or service Be sure that connecting plugs are in place before replacing the front cover 5 Be sure that the relay case is hard wired to earth ground using no smaller than 12 AWG copper wire to the ground terminal on the rear of the unit It is desirable to use a separate ground wire to the ground bus for each relay If this is not practical the number of relays sharing a ground wire should be kept to a minimum Page 17 4 3 Dielectric Test In accordance with ANSI IEEE C37 90 1989 and 255 5 one minute dielectric high potential tests may be performed up to 1500 VAC 45 65 Hz This applies to all terminals including the ports Note that this device employs decoupling capacitors to ground from terminals 3 4 9 A and B Accordingly a leakage current of 100 mA max is to be expected at these terminals 4 4 Mounting The SCOR relay is supplied in a standard S1 size drawout case Figure 4 provides the outline dimensions for this case The panel drilling and cutout dimensions for this case are provided in Figure 5 The relay does not have to be mounted vertically Any convenient mounting angle may be chosen 4 5 Connections The connections for the relay
44. ion for 5 seconds when ConF is displayed selects the DATA mode and also loads data changes if any into memory When neither dAtA nor ConF is on the display holding the switch up in the MODE position identifies the register whose contents were on display immediately before the switch was operated Each time the switch is toggled to the NEXT position down the display advances to the next function in the sequence if the DATA mode was selected or to the next operating parameter if CONF was selected Active in the CONFiguration mode only Increments if raised or decrements if depressed the value of the displayed register Indicates the current tap range HIGH or LOW that applies to the relay s internal scaling of the ground current input Reference the front panel TAP value table locator O Note that the range is determined during manufacture by the style number of the relay The position of this plate serves only a documentary purpose 2 Controls and Indicators Locator Page 9 Table 2 Controls and Indicators continued Name POWER indicator TARGET RESET switch ELEMENT targets TAP scaling chart FUNCTION targets TIME INST 1 INST 2 CLOSE not illustrated PUSH TO ENERGIZE OUTPUT I2 CLS not illustrated TT Function Red LED that illuminates when relay power supply is functioning Raising this switch simultaneously resets all of the targets locators N and P if relay is powere
45. lay The selected operating current can then be switched to the relay s sensing inputs b The current source needs to be capable of delivering at least 20 A This is necessary to test the full capability of the instantaneous overcurrent element c Because the current levels used to verify operation of the instantaneous overcurrent element s may exceed the continuous current rating of the relay it is sug gested that the current source include a provision for automatic removal of the test current following a trip 2 A timer accurate to within 0 001 seconds 3 Two test plugs Siemens p n 00 871 854 001 Basler p n 10095 or GE p n XLA12A Replaces the paddles when testing an installed relay 4 For bench testing An appropriate AC or DC power source for relay operation 4 Installation and Testing Several proprietary test sets are marketed which combine the current source and timer and include other features to simplify setup 4 7 2 Preliminary Steps 1 With the connecting plugs removed connect the unit as shown in the following figure numbers 1st Digit of Figure Style Number Sensing Input Configuration Number K Single phase 8 G Three phase 9 H Three phase with ground 10 11 X Two phase with ground 12 2 Insertthe relay connecting plugs if bench testing If relay is installed insert test plugs instead Before applying power check thatthe Relay Fail contactis closed terminals 11 and 12 3 Apply op
46. ld up Circuit 0 None 1 One Inst Element 1 H Three Phase with Ground Current X Two Phase with Ground Current 2 Two Inst Elements 1 OR One Inst Element and one External 3 Program Controlled TARGET TIMING Z5 Switch Selectable B and C Timing B Function targets are current operated element targets are Contact Curves internally operated Contact OPTION 4 OR Separate Ground Trip S Semi Flush Mounting SENSING INPUT TAP RANGE 1 2 0 11 A for all phases NOTES 0 5 5 0 A for ground 2 0 5 5 0 A for all phases 2 0 11 A for ground 3 0 5 5 0 A for all inputs 4 2 0 11 A for all inputs 3 Option 2 must be C 1 Each element includes a relay which energizes for either a phase or a ground instantaneous trip 2 Sensing input range must be 3 or 4 OPTION 2 N None Communications Board Installed Figure 2 Style Number Identification Chart MIN MAX log which contains the minimum and maxi mum current and demand values which have occurred since last cleared Configuration data for all registers listed inTable 3 Page 11 including time overcurrent function and curve se lected pickup settings and current transformer ratios Whichever portis used allcommunications must be initiated by the Power Monitor unit or computer When
47. liseconds Specifications Page 42 Overcurrent Timing Characteristics Characteristic Time Dial Time Delay Accuracy Instrumentation Feature Communications Option Power Supply Target Indicators Single Phase Units Multi Phase Units Table C 1 Specifications continued The relay incorporates all of the time overcurrent characteristics shown in Figures A 1 through A 16 in Appendix A Selection of specific timing characteristic is accomplished by programmed instructions Separate selections can be made for phase current and for ground current Refer to Figures A 1 through A 16 in Appendix A which show 14 of the 100 available curves for each type The time overcurrent delay shall be within 5 or 20 milliseconds whichever is greater of the characteristic curves shown in Figures A 1 through A 16 in Appendix A for any combination of TIME DIAL and pickup setting at 25 C The time delay shall not vary more than 5 over the temperature range of 40 to 70 C 40 to 158 F Provision is made to monitor primary current on a realtime basis Accuracy is within 2 Range is from 1096 of at the low end to 15096 of at the high end Includes an RS 232 port on the front panel for local testing and configuration and an RS 485 port at rear of unit for operation by a Siemens Power Monitor unit at distances up to 4000 feet using baud rates up to 19 200 Power for the in
48. ne adjustment of the current pickup point is determined by the value 0 to 99 stored in the relay s Tap Cal registers again one setting for the phases one for ground When the Tap Cal register contains the value 0 the pickup setting of the relay is the indicated TAP setting The Tap Cal registers provide a means of adjusting the timed trip pickup between the selected position of the TAP switch and the next higher position For example when the TAP switch is setto position A the Tap Cal register provides an adjustment from 0 50 to 1 00 A forthe LOW range and from 2 00 to 3 00 A forthe HIGH range EXCEPTION At the highest TAP position the setting of the Tap Cal register is ignored Therefore the J values of 5 0 and 11 00 representthe upper limits ofthe LOW and HIGH ranges respectively Page 37 B 3 Power Supply B 3 1 General The solid state power supply is a low burden flyback switching design which delivers a nominal 5 and 12 VDC to the relay s internal circuits also an isolated 5 Vdc forthe communications circuits The inputterminals ofthe power supply are not polarity sensitive A red POWER LED illuminates to indicate that the power supply is functioning B 3 2 Loss of Power Sensing A loss of power circuit monitors the power supply If power is interrupted a Power Fail signal is delivered to the computer in time for it to store all vital information in non volatile registers Also at this time the R
49. nuous current rating for each input is five times tap or 20 A whichever is less The one second current rating for each input is 50 times tap or 500 A whichever is less Ratings at less than one second are calculated as VK T where 500 A or 50 times T Time that current flows in seconds Less than 0 025 ohms per phase at nominal 60 Hz see Table 3 60 Hz Two ranges are available HIGH 2 0 11 0 A and LOW 0 5 5 0 A Range is independently specified for phase and ground by the second digit of the Style Number The TAP range windows on the front panel indicate which range HIGH or LOW is specified Selection of the desired tap is made using the rotary selector switch s on the front panel Refer to the table on the front panel for the various tap ratings in secondary amps Incrementally adjustable over the selected range by a front panel TAP selector switch coarse and by numerical data entered into the Tap Cal register fine The accuracy of the pickup setting is 296 of the programmed setting over the full specified range of the relay at 60 Hz Within 296 Better than 8096 of the established pickup level within 50 milliseconds 0 5 to 20 times the value of the time overcurrent tap setting The accuracy of the instantaneous pickup setting is 296 of the programmed setting over the full specified range of the relay at 60 Hz Better than 8096 of the established pickup level within 50 mil
50. of the phase Instantaneous Overcurrent pickup to the phase Time Overcurrent Tap is calculated as follows Phase Instantaneous Overcurrent 14 4 Phase Time Overcurrent Tap 4 0 Ratio 14 4 4 0 3 6 Set 1 to 3 6 5 ratio of the ground Instantaneous Overcurrent pickup to the ground Time Overcurrent Tap is calculated as follows Ground Instantaneous Overcurrent Ground Time Overcurrent Tap Ratio 6 4 1 5 Set 1 to 4 27 6 4A 1 5A 4 27 6 From Curve b6 Figure A 6 find the phase TIME DIAL setting that corresponds to a delay of 0 38 seconds at 6 times the pickup setting Answer A TIME DIAL setting of 07 7 From Curve b5 Figure A 5 find the ground TIME DIAL setting that corresponds to a delay of 0 37 seconds at 6 times the pickup setting Answer A TIME DIAL setting of 05 3 4 3 Entering the Settings 1 Set PHASE TAP Switch Front Panel on C and GROUND TAP Switch Front Panel on C Operation by Front Panel Load b6 into the phase Curve Type register and b5 into the ground Curve Type register Enter 70 into the phase Tap Cal register and 20 into the ground Tap Cal register Enter 3 6 into the phase instantaneous 1 overcurrent register and 4 27 into the ground Instantaneous 1 Over current register Enter 07 into the phase TIME DIAL register and 05 into the ground TIME DIAL register Page 16 4 Installation and Testing 4 1 General When not shipped as part of switchgear
51. onitoring Unit Manual SG 4018 01 While every comprehensive test program should cover all ofthe above items the amount of testing within any category can vary over a great range The operational test defined below illustrates an appropriate lower limit for this range 4 7 Operational Test Confirmation of every parameter within the capability of this relay is usually not practical nor necessary except as an Page 20 acceptance procedure for a newly delivered relay Succeeding tests can be reduced in scope to conserve time and thereby permit more frequent tests Such an operational test may be accomplished by scaling down the verification tests of this subsection as follows 1 Byconcentrating on the parameters actually required in the assigned application 2 Byusing spottests that check for example only one or two multiples of applied TAP current at only one or two TAP positions Accordingly the procedures described below can serve as the basis for both verification and operational testing This procedure verifies the operation of the unit Check the Style Number Identification Chart Figure 2 with the style number of the relay to identify the options included within the specific relay to be tested 4 7 1 Equipment Required 1 The current source used in the following tests should have the following capabilities a Current output should be switchable so that the test current can be set before it is applied to the re
52. ons DC Interface Level AID Converter Conv Y 4 1 7 Stobe H H Input Select Overcurrent Comparator Display Phase Tap lt Sel Sw plexer Ground Current Scaling Ground Tap Switch Position FUNCIDATA Timing Outputs 5 Trip Comparator Target Time Overcurrent Functions Sel Sw POWER Operating SUPPLY Power Loss Of Power To Internal Circuitry Characteristic Output Curves Interface Power Fail HI LO Range Register Detector Watchdog Circuitry Figure B 1 Functional Block Diagram Appendix Functional Description of Operation Registers one register for the phases one for ground All current sensing and pickup data is weighted by the computer accordingly B 5 5 Watchdog Circuitry The watchdog circuit checks that the microcomputer is opera tional If some transient condition has disrupted its normal pattern of operation the watchdog will momentarily close the relay disabled output contact resetthe computer and reinitialize the program The computer is then restarted and the relay resumes its monitoring
53. or Semi Flush Mounting D492 003 4 16 90 4 Installation and Testing Page 19 BE1 51SCOR O 99G9 Overcurrent FOR SENSING INPUT TERMINALS SOLID STATE PROTECTIVE RELAY SEE PRECEDING PAGES J O RELAY DISABLED 9 5 485 PORT TIMED TRIP 0 OPTION 1 1 INST 1 DTR TX GND Es OPTION 1 2 INST 2 pt 6 A OR COMMAND CLOSE RI RS 232 PORT COM 9 7 MANUFACTURED FOR SIEMENS LoL eR FRE gt POWER SUPPLY INPUT L 52 2 9 9 9 0 0 OR GROUND TRIP gt amp 8 2 9 v REAR VIEW OF RELAY SHOWING ACTUAL DIODES AND RESISTOR ARE INTERNAL COMPONENTS OF POSITION OF TERMINALS THE RELAY THEY ARE SHOWN HERE INDICATE THE SOURCE OF DIRECT CURRENT FOR 52b SENSING POWER THE RS 232 PORT 15 FRONT PANEL ALL OTHER CONNECTIONS ARE AT REAR OF CASE Figure 6 Relay Connections TRIP BUS SCOR RELAY LEGEND 51 TIMED TRIP 50 1 INSTANTANEOUS OVERCURRENT 1 50 2 INSTANTANEOUS OVERCURRENT 2 RELAY DISABLED CONTACT 50 2 INSTANTANEOUS OVERCURRENT 2 REQUIRES OPTIONS 1 2 AND 2 C PLUS A PROGRAMMING CHANGE SEE PAGE 3 52 52b BREAKER AUXILIARY C
54. ored phases These families are graphi Cally illustrated in Figures A 1 through A 16 in Appendix A If ground current is monitored its timing characteristic is indepen dently selected from the 16 families Selection of the timing characteristics is made atthe front panel or via one ofthetwo communications links After a characteristic is selected it is adjusted to specific requirements by choosing the TIME DIAL number These are the numbers in a vertical row along the right hand margin ofFigures A 1 through A 16 This TIME DIAL number 0 to 99 selects one ofthe 100 characteristic curves available for each characteristic Only 14 of the 100 curves in the relay s memory are shown on each graph because of space limitations The selected TIME DIAL number is entered into the relay s memory again using either the front panel data entry controls or one of the two communications links The available charac teristic curves include one definite time six inverse time and nine curves Refer to Table 4 1 3 3 Trip and Reset When the monitored current exceeds the overcurrent pickup point the TMG LED illuminates as timing begins The timing process continues until the interval calculated by the selected time overcurrent characteristic is completed thereby tripping the associated output contact and target indicators or until the sensed overcurrent drops below the pickup setting which causes the timer to reset In either case or
55. page 27 Figure A 1 through Figure A 16 illustrate the characteristic curves that are programmed into the nonvolatile memory of this relay Refer to Table 1 on Page 5 for a listing of the 16 characteristic curves Note that a drawing number is given under each caption Use this number to order a full size 10 x 12 Characteristic Curve set The Phase and Ground Instantaneous Time Curves are pre sented in Figures A 17 and A 18 respectively Appendix A Time Overcurrent Characteristic Curves 2 Figure A 1 Timing Type b1 Short Inverse Time Figure A 2 Timing Type b2 Long Inverse Time Dwg No 18 752 294 001 Dwg No 18 752 294 002 Appendix Time Overcurrent Characteristic Curves page 29 Figure A 3 Timing Type b3 Definite Time Figure A 4 Timing Type b4 Moderately Inverse Dwg No 18 752 294 003 Dwg No 18 752 294 004 Appendix A Time Overcurrent Characteristic Curves page Figure A 5 Timing Type b5 Inverse Time Figure A 6 Timing Type b6 Very Inverse Time Dwg No 18 752 294 005 Dwg No 18 752 294 006 Appendix Time Overcurrent Characteristic Curves page Figure A 7 Timing Type b7 Extremely Inverse Figure A 8 Timing Type 08 Dwg No 18 752 294 007 Dwg No 18 752 294 008 Appendix Time Overcurrent Characteristic Curves page Figure A 9 Timing Type c1 w Limit 1 Figure A 10 Timing Type c2 T w Limit 2 Dwg No 18 752 294 009 Dwg No 18 752 294 010 Appendix Time Ov
56. plication The SCOR relay is utility grade and is provided in a draw out case with built in test facilities It is used for the protection of medium voltage electrical power systems It is designed to monitor the outputs of standard 5 A secondary current trans formers and when it operates to close an output contact that may be used to trip a circuit breaker The relay requires control power for its internal circuits A number of ac and dc voltage options are available for this purpose that match the usual ac or dc control power used for tripping the circuit breaker 1 3 The Time Overcurrent Function 1 3 1 Pickup A coarse incremental selection of overcurrent pickup tap is provided by front panel rotary switches One switch simulta neously sets the pickup tap for all the monitored phases If ground is also monitored a second rotary switch independently sets the ground overcurrent pickup tap A fine incremental adjustment that provides 99 intermediate pickup points between adjacent positions of the rotary switches is provided by entering data into the memory of the internal microcomputer tap calibration registers 1 3 2 Timing A time delay is initiated when a pickup point is exceeded When the current drops below pickup the timing circuit is reset immediately The amount of delay required before trip is a function of the overcurrent magnitude One of 16 families of time overcurrent characteristics may be selected for the monit
57. pose This four character seven segment LED display with a right hand decimal point for each digit has two modes of operation 1 the DATA mode which permits reading the information registers in primary kilo amperes and 2 the CONFiguration mode that permits reading and writing into those registers that control operation of the relay The instrumentation registers monitor the input current and the demand current in kilo amperes A row of dashes indicates an out of range condition Dashes along the bottom of the display indicate that the current is somewhere below 10 of TAP dashes along the top indicate a current above 150 of TAP When the relay is powered up the display will default to the DATA mode Crossing from one mode to the other and entering modifying the data is described briefly below locators J and in detail in Operation by Front Panel When the display exhibits the word dAtA for 60 seconds the display will begin scrolling through the instrumentation registers in a fixed sequence After stepping through all of the DATA registers the display wraps around to repeat the sequence until instructed otherwise This process is covered in detail beginning on Page 10 A front panel switch locator I can cause the display to exhibit a particular register of interest in either mode while the CONFiguration mode neither the UP DWN nor the MODE NEXT switches have been actuated for one minute the display will reve
58. relay that can optionally be equipped to communicate with a remote computer The following text is referenced to Figure B 1 which is a functional block diagram that illustrates the overall operation of a fully implemented version of the relay B 2 Current Sensing The SCOR relay can be provided for single phase two phase with ground three phase or three phase with ground current monitoring The illustrated relay is of the three phase with ground style The internal current sensing transformers are designed to receive their input from the 5 A nominal secondaries of standard current transformers CTs Note the dual primaries of the internal transformers One or the other is connected by the factory to obtain a LOW or a HIGH current sensing range 0 50 to 5 0 A or 2 00 to 11 00 A in accordance with the specified Style Number of the relay The outputs of the internal transformers are applied to scaling circuits one for each of the phases one for ground that convert each of the input currents to a voltage level that can be utilized within the relay A coarse incremental adjustment for the current pickup setting is provided by the TAP switches These are front panel rotary switches one for the phases and another for ground if ground current is monitored The current setting represented by each of the 10 switch positions is given for each range HIGH and LOW in the table printed on the front panel Reference Figure 3 The fi
59. rent monitor ing 3 4 2 Calculating the Settings 1 The time overcurrent characteristic must be selected such that it will coordinate with the other relays in the system to meet the protective needs of the application Assume that a Very Inverse function is suitable for phase protection and Inverse for ground protection From Table 1 we see that these two characteristics are designated b6 and b5 re spectively The table also provides the figure numbers that illustrate the desired curve sets 2 Note that the phase time overcurrent pickup 4 7 A falls between tap C and tap D of the HIGH range as shown on the panel chart illustrated in Figure 3 The phase Cal value which interpolates between TAP switch posi tions is then calculated as follows Given Pickup value 47 C HIGH 40 D HIGH 5 0A Page 15 Then Set Phase Tap Switch Front Panel on C Span D Tap 1 00 Difference Pickup value Tap 0 70 Tap Cal value phase Difference Span x 100 0 70 1 00 x 100 70 3 The ground time overcurrent pickup 1 6 A falls between tap C and tap D of the LOW range Figure 3 The ground Tap Cal value is Pickup value 1 6A Tap C LOW 1 5A Tap D LOW 2 0 Then Set Ground Tap Switch Front Panel Span D Tap 0 5 Difference Pickup value Tap 0 1 Tap Cal value ground Difference Span x 100 0 10 0 50 x 100 20 4 The ratio
60. rs 11th and 12th in the sequence of Table 3 may contain any of 16 codes b1 through b8 and cl through c8 representing the curve types listed in Table 1 Refer to Figures A 1 through A 16 in Appendix A for graphic representations of these curves Page 13 3 2 12 Selecting the CT Ratios Registers 13 through 16 provide a multiplier that allows the microprocessor to match the relay s response to the turns ratio of the external CTs The relative turns ratio of the CTs is expressed as a fraction whose denominator is 5 3 2 13 Current Sensing Range The 17th and 18th registers in the sequence display the current sensing range to which the relay is configured either HI or LO in accordance with the style chart This is a factory setting 3 2 14 Demand Period Register 19 Table 3 indicates the number of minutes in a demand period This figure is used to calculate the demand current For further information look under Instrumentation Display Page 14 3 3 The DATA Mode 3 3 1 Defined The DATA mode is the normal operating state of the relay When in this mode all the read only registers which are accessible from the front panel may be viewed by stepping the MODE switch or by automatic scrolling described later In DATA mode the STATUS LED is off 3 3 2 Entering the DATA Mode Ifthe STATUS LED is on the relay is in the CONFiguration mode To leave the CONFiguration mode and enter the DATA mode depress the MODE NE
61. rt to the DATA mode This protects the settings by requiring the deliberate action of loading to effect a change In the DATA mode however a specifically selected register can be displayed indefinitely Note that when in the CONFiguration mode the relay is inoperative 2 Controls and Indicators Page 8 Locator Table 2 Controls and Indicators continued Name RS232 PORT Supplied with the communications option TMG indicator ground GROUND TAP selector STATUS indicator MODE NEXT switch UP DOWN switch Tap range ground Function Provides interconnection for any RS 232 device that is to be used for reading and or changing data in the relay registers when the communication option is supplied An LED that illuminates when the preset ground overcurrent pickup point is exceeded to indicate that timing is underway A ten position switch that provides an incremental adjustment of the ground current pickup point The switch positions are defined for both HIGH and LOW range in a table printed on the front panel locator O Intermediate settings between the switch positions may be established by the Tap Cal register An LED that illuminates whenever the relay is in the CONFiguration mode Holding this switch in the MODE position up for approximately 5 seconds when the word dAtA is exhibited on the FUNCTION DATA display locator D selects the CONFiguration mode Holding the switch in the MODE posit
62. t indicator is set to show that an instantaneous output was tripped On multi phase relays an additional indicator denotes the phase or ground element which initiated the tripping If an instantaneous option is selected for a relay which includes both phase and ground sensing then an instantaneous output is supplied which operates for both phase protection and ground protection The instantaneous phase and ground pickup points are independent of each other The desired instantaneous overcurrent pickup values for phase and for ground are entered via the data entry controls atthe front panel This can also be done remotely by the data link if the communications option is present 1 6 The Ground Time Overcurrent and Instantaneous Functions When the sensing input type includes ground current sensing the relay is supplied with a separate and independent time overcurrent function for ground as previously described for the phases When instantaneous is selected it is supplied for both phase and ground The signal for the ground function can be obtained by connect ing the ground element in the residual circuit of three current transformers connected in the phases 51N or 50N 51N from a current transformer in series with the connection from the power transformer neutral to ground 51G or from a core balance current transformer encircling all phase conductors often called a zero sequence 5165 or 5065 5165 Refer to Figures 8 t
63. ternal circuitry may be derived from ac or dc external power sources as indicated in Table C 2 If ac control power is used a separate power supply hold up circuit is required Option 3 1 The targets are magnetically latched type Current operated targets are furnished for each of the tripping outputs included within the relay e g TIME and INSTantaneous overcurrent functions To trip a current operated target requires a minimum of 0 2 A in the output circuit of its associated output contact This confirms that current has flowed through the relay output contacts and the external trip circuit Includes the above plus an internally operated target for each phase element A B C and or ground which may initiate a trip Appendix Outputs Resistive Inductive Shock Vibration Isolation Surge Withstand Capability Radio Frequency Interference RFI Temperature Operating Temperature Storage Weight Case Size Certification Specifications Page 43 Table C 1 Specifications continued Output contacts are rated as follows 120 240 VAC Make 30 A for 0 2 seconds carry 7 A continuously break 7 A 250 VDC Make and carry 30 A for 0 2 seconds carry 7 A continuously break 0 3 A 500 VDC Make and carry 15A for 0 2 seconds carry 7 A continuously break 0 1 A 120 240 VAC 125 250 VDC Break 0 3 A L R 0 04 In standard tests the relay has withstood 15 g in each of three mutually perpendicular
64. the relay current level The input waveform is sampled several times to determine instantaneous values These instantaneous values are processed to obtain the true RMS value of the input current B 5 3 Time Overcurrent Calculations If the magnitude of the current exceeds the pickup setting the microprocessor calculates the required time delay by evaluat ing the magnitude of the overcurrent in the context of the desired time overcurrent response curve All of the time overcurrent functions that are graphically illustrated in Figures A 1 through A 16 are in the computer s memory The current inputs are continuously polled and the calculations updated once for every 60 Hz line cycle As long as the sensed current is above the pickup point the elapsed time is accumu lated toward trip However once the sensed current falls below pickup the relay is reset and all accumulated time is cancelled When the value of a sensed current exceeds the pickup setting the TIMING LED for that phase will light The LED will stay lit as long as the sensed current exceeds the selected pickup level B 5 4 High Low Range Register It was noted earlier in this section that the input transformers mustbe wired forone oftwo sensing ranges HIGH orLOW This information is recorded at the factory into the HI LO Range RS 485 Port MICRO Communi Scaling ne o Phase Current Sample COMPUTER cati
65. tions installed except Option 1 2 All of the front panel controls darker indicating that the relay caused an overcurrent timed trip and indicators are called out and assigned a locator letter Table due to a fault on Phase and the targets have not been reset 2 supplies a description for each Data is displayed in primary kilo SCOR Function Time Inst 1 Figure 3 Controls and Indicators 2 Controls and Indicators Locator A Name PHASE TAP selector Timing indicators phase Range plate phase FUNCTION DATA display7 Page 7 Table 2 Controls and Indicators Function A ten position switch that provides an incremental adjustment of the current pickup tap for all of the phases simultaneously The switch positions are defined for both HIGH and LOW range in a table printed on the front panel locator O of Figure 3 Intermediate settings between the switch positions may be established by the Tap Cal register LEDs that illuminate when the preset overcurrent pickup point for the corresponding phase is exceeded to indicate that timing is underway Indicates the current tap range that applies to the internal scaling of all the phase inputs of the relay The range is either HIGH or LOW Reference the TAP value table locator Note that the range is determined during manufacture by the style number of the relay The position of this plate serves only a documentary pur
66. to display the register abbreviation After the 22nd register is reached one more depression of the NEXT switch brings the display back full circle to the ConF position Atthis point you havethe option of stepping through the configuration registers again or returning to the DATA mode To effect the latter raise the MODE switch up and hold it there until the word dAtA appears in the display This requires about 5 seconds 3 2 4 Loading the Read Write Registers As the MODE switch is held raised in the procedure just described for returning to the DATA mode the display should become blank and then after about 5 seconds the message EE should appear This indicates that the data changes made while in the CONFiguration mode have now replaced the former contents of the registers in the nonvolatile memory After a brief interval the display changes again to read dAtA The relay is now retumed to its normal operating mode 3 2 5 Programming Note SCOR relays supplied on Siemens switchgear products are normally configured at the factory with the following settings Register 1 Address Addr Register 2 Baud Rate bAud 4800 Register 13 Phase CT Primary Amps PPri Register 15 Ground CT Secondary Amps nPri 3 Operation by Front Panel Page 11 Table 3 Configuration Mode Display Sequence Register Register Display Display Register Register Sequence Abbreviation Function Range LonF Addr b A Lu d
67. ts are selected one of them can be programmed to operate directly from the system computer Page 39 assuming thatthe Communications Option is also present The programming information is supplied in the Siemens Power Monitor Display and Monitoring Unit Manual SG 4018 01 The second output relay when controlled by the computer cannot simultaneously serve as an instantaneous output Optionally this extra output relay can be programmed as a dedicated ground trip contact B 7 Target Indicators Targets are provided for each function TIME INST 1 and INST 2 CLOSE or GROUND and for each phase and ground that is monitored on multiphase relays Each target indicator is visible on the front panel of the relay with the cover in place When operated the disk in the target changes from black to orange and is magnetically latched in this position The FUNCTION targets only operate when a minimum of 0 2 A flows through the associated relay s output circuit This is to provide confirmation that the contact actually did close and that a signal was delivered The ELEMENT targets i e phase and ground are internally operated To monitor output current the coil of a special reed relay is placed in series with the output contacts The reed relay signals the target The series impedance of the reed relay coil is less than 0 1 ohm To reset the target s after an abnormal system condition has been cleared manually raise the target r
68. y is in the configuration mode i e when the letters ConF appear in the front panel display and the STATUS LED is illuminated These registers may also be read or altered remotely by computer 3 22 Entering the Configuration Mode IMPORTANT NOTE It is recommended that the Circuit Breaker be in the open position while the SCOR relay is being configured from the front panel The SCOR relay is inoperative in the CONFiguration mode To leave the DATA mode and enter the CONFiguration mode depress the MODE NEXT switch repeatedly until the word dAtA is in view on the front panel display Then hold the switch up for approximately five seconds during which time the display Page 10 becomes blank Release the switch after ConF appears in the display Upon release of the MODE switch the STATUS LED will be lit and ConF will be in view on the FUNCTION DATA display Releasing the MODE switch before 5 seconds has expired returns the unit and display to the DATA mode 3 2 3 Stepping Through the Read Write Registers Starting with the display reading ConF you may step through the configuration registers by depressing and releasing the NEXT switch The registers will appear in the sequence given in Table 3 Alternately the register abbreviation will be displayed fol lowed by the value or choice for that register If you stop the value is displayed If you forget what register is being displayed lift up on the switch again

- Siemens

Contents

Download Pdf Manuals

Related Search

Related Contents