S1-1052 - BiddleMegger.com
Contents
1. and 10m Pressing the Q 1 button toggles the display to show the insulation resistances insulation currents DAR and PI ratios and capacitance The resistances and currents will be displayed under the TI T2 Im and 10m segment headings the ratios under the DAR and PI segment headings The capacitance reading is indicated by its units of either nF or uF Refer to section Q I button Breakdown mode burn mode The insulation resistance IR test operates in either the Burn or Breakdown mode of operation The default mode is breakdown To change mode press and hold the function button then press and release the mode button repeatedly until the desired mode is indicated by the flashing symbol on the display Release the function button to select it In the breakdown mode the Breakdown Indicator will be illuminated refer to page 6 In this mode the test will automatically terminate should the insulation break down to prevent damage to the insulation under test In the burn mode the Burn Indicator is illuminated refer page 6 The burn mode disables the normal breakdown detection and enables the insulation test voltage to continue even after breakdown of the insulation This will enable the location of the failure to be seen and heard Due to the potential damage that could occur the unit produces two long beeps when starting a test with burn2. V When testing the voltage displayed is the voltage present at the test terminals of the instrument If the test voltage is changed by pressing either of the test voltage A and W buttons during a test the new test voltage is displayed momentarily After testing the voltage displayed is the voltage present on the terminals To see what the voltage was immediately prior to the end on the test press either test voltage A or V buttons Timer indicator The timer shows minutes and seconds At the start of a test the timer will start from zero and at the end of a test it will stop The duration of the last test remains on the display until another test is started Digital display The digital display shows the resistance or current being measured during a test The Q I button toggles between the two After a test the display 13 shows the last measurement made until the timer or voltage test settings Pre Test During test Key action table are changed or the test start stop button is pressed Key action Fn Key action a n 9 VA VV Increase Increase Increase Increase feel for how a measurement is progressing The analogue display shows decrease the decrease ithe decrease the decrease the resistance only test voltage in test voltage in test voltage in test voltage in major steps major steps minor steps minor steps IR only CIR only Button press During test Analogue display This simulates
3. button when pressed allows other keys to perform another function This is summarized in the table below VA and VW represent the 10 test voltage buttons TA and TY represent the timer buttons Button Press Function Comment Fn VA Increment in 10 V steps Voltage range between 50 and 1000 V Fn VV Decrement in 10 V steps Voltage range between 50 and 1000 V Fn VA Increment in 25 V steps Voltage range between 1000 and 10000 V Fn VY Decrement in 25 V steps Voltage range between 1000 and 10000 V Fn TA or TV Cycle through timers Select main timer T1 or T2 Fn Mode Cycle through IR modes Select breakdown burn or alarm limit for IR test Fn Q_Q Download mode See Downloading results Fn Q_Q Clear stored data The record button is Mode button pressed twice Press down on the MODE button to cycle through and select the test mode Modes of test to be chosen from include an insulation resistance IR test a polarization index PI test a step voltage SV test and a dielectric discharge DD test The insulation resistance IR test operates in either burn or breakdown mode with an option of setting a resistance threshold alarm limit These modes can be cycled through and selected by holding down the Fn button and pressing the Mode button Timer A and Y buttons The main timer can be set up to 99mins 59secs The TA button increments the
4. during testing A high level of internal isolation allows the instrument to be used while the unit is supplied from the mains An internal battery management system switches the instrument off after ten minutes of inactivity If the battery approaches a very low state of charge the instrument turns itself off and mains power must be applied before the instrument can be used again Recorded test results and settings will not be lost when the instrument is switched off A comprehensive LCD display shows resistance current capacitance time constant voltage timer measurements and figure of merit measurements such as polarisation index Features m Continuous resistance or current measurement on main display m Optional resistance current or figure of merit measurements on secondary display m Standard test voltages 250 V 500 V 1 kV 2 5 KV 5 kV 10 kV m Non standard test voltages selectable between 50 V and 1 kV in 10 V steps and selectable between 1 kV and 10 kV in 25 V steps m Test modes include insulation resistance polarisation index step voltage and dielectric discharge m The dielectric absorption ratio is automatically calculated if the corresponding timers are set a Either burn or breakdown selectable in insulation resistance mode m Insulation Alarm Limit available in insulation resistance mode m Programmable timers include a main test duration timer plus T1 and T2 timers for time resistance method
5. example there may be surface leakage paths across the insulation between the bare cable and the external sheathing due to the presence of moisture or dirt Where it is required to remove the effect of this leakage particularly at high testing voltages a bare wire may be bound tightly around the insulation and connected via the third test lead to the guard terminal G Leakage Path ae pi it fi J i Baer ete To ve Terminal The guard terminal is at the same potential as the negative terminal Since the leakage resistance is effectively in parallel with the resistance to be measured the use of the guard causes the current flowing through surface leakage to be diverted from the measuring circuit The instrument therefore reads the leakage of the insulator ignoring leakage across its surface The display will show FUS if the internal guard terminal fuse is found to have blown The instrument must be switched off to clear the message before further testing is permitted The fuse should be replaced by an authorised repairer The instrument may be used in the mean time if the guard terminal not used Refer to notes regarding measurements above 100 GQ on page 17 RS232 USB connection Data can be transferred to a PC via an RS232 or USB port If using the RS232 port use the null modem cable supplied The RS232 settings are 38400 Baud 8 data bits 0 parity 1 stop bit no flow control handshake If using the U
6. mode activated Alarm limit mode The insulation resistance IR test has an option of setting an alarm limit If this mode is selected the instrument will beep should the resistance reading exceed a user selectable threshold To set the limit hold down the function button then press and release the mode button repeatedly until the A symbol is flashing on the display Use the timer A and Y buttons 15 to set the resistance threshold between the limits of 10 kQ and 35 TQ Release the function button to save the current limit Adjusting the alarm threshold level automatically activates the alarm limit mode This is indicated by the A f symbol turning solidly on To toggle the alarm limit mode on off hold down the function button then press and release the mode button repeatedly until the A t symbol is flashing on the display Release the function key to toggle Step voltage SV test This is a test based on the principle that an ideal insulator will produce identical readings at all voltages while an insulator which is being over stressed will show lower insulation values at higher voltages The main timer and test voltage settings can be adjusted if desired from their default values of 5 minutes and 1 kV respectively During the test the applied test voltage incrementally steps by one fifth of the test voltage setting final value every minute for 5 minutes taking successive measurements until the final voltage i
7. repair by suitably trained and qualified personnel The protection is likely to be impaired if for example it shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been subjected to severe transport stresses NEW INSTRUMENTS ARE GUARANTEED FOR 1 YEAR FROM THE DATE OF PURCHASE BY THE USER Note Any unauthorized prior repair or adjustment will automatically invalidate the Warranty CALIBRATION REPAIR AND SPARE PARTS For service requirements for Megger Instruments contact Megger Limited or Megger Archcliffe Road Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England U S A Valley Forge Corporate Centre Tel 44 0 1304 502 243 Tel 1 610 676 8579 Fax 44 0 1304 207 342 Fax 1 610 676 8625 Megger operate fully traceable calibration and repair facilities ensuring your instrument continues to provide the high standard of performance and workmanship you expect These facilities are complemented by a worldwide network of approved repair and calibration companies to offer excellent in service care for your Megger products Returning your product to Megger UK and USA service centres 1 When an instrument requires recalibration or in the event of a repair being necessary a Returns Authorisation RA number must first be obtained from one of the addresses shown above You will be asked to provide the following informati
8. selectors Present indicator Power on off Backlight Q selector on off Data record Function Mode Test start stop High voltage warning indicator Voltage at terminals Battery level Breakdown indicator High voltase warning _ indicator Dielectric Pan absorption ratio T1 timer Test modes Burn indicator Alarm Data recording OM te ey 10G 4 pa il 100k 1T v Je Analogue display GOTO Pe fat E i 1 warning indicator a BBs i Digital Polarisation Time Capacitance display index timer T2 constant display Power On Off button The instrument will only turn on if this button is pressed held and then released when the display responds The instrument will not turn on if the button is released before the display responds or if the button is held down for too long This is a safety feature to prevent the instrument being inadvertently turned on The instrument is turned off either by pressing the button again or if the instrument is running on the battery by timing out after 10 minutes of inactivity Upon switching the instrument on the display will first show Ini while it undergoes a self checking routine When Ini disappears the instrument is ready for use Test voltage A and V buttons Using these buttons one of six test voltages can be selected 250 V 500 V 1 kV 2 5 kV 5 kV and 10 kV The selected voltage is shown on the display Anon standard voltage bet
9. time and the TW button decrements the time in ten seconds steps An auto repeat facility allows the time to be set more quickly Setting a time of 00 00 disables the timer With the timer disabled a test has to be manually stopped To select timer Tmain T1 or T2 hold down the Fn button whilst repeatedly pressing the TA or TY buttons To set the selected timer release the Fn button and use the TA or TY buttons The minimum timer setting is 15 seconds for test voltages of 1000 V or more and 30 seconds below this Note T2 cannot exceed the time on main timer unless it is disabled 00 00 T1 cannot exceed the time on T2 Record button This button is used to start and stop recording Recording can only be activated before testing When data recording is enabled the record symbol flashes Data is stored in solid state memory and under normal circumstances will maintain its integrity for in excess of ten years but may rarely be corrupted or lost by external influences such as transients and static discharge Megger Limited cannot accept responsibility for any losses of data Regular downloading to a PC using software such as Download Manager will substantially reduce any such risk Recording to on board memory Press the record button to start and stop recording When data recording is enabled the record symbol will flash on and off repeatedly Recording can only be activated before testing commences Results are stored at 15 30
10. type tests m Load capacitance and time constant measurements displayed at end of test m LCD backlight m Data storage data retrieval and real time data output m USB or RS232 communications m Battery level charge level indicator Cleaning Disconnect the instrument and wipe it with a clean cloth slightly damped with soapy water or Isopropyl alcohol IPA POWER LEAD AND BATTERY CHARGING If the power lead supplied is not suitable for your mains connection do not use an adaptor Always use a power lead fitted with the correct plug The instrument is fitted with a two pin IEC60320 power inlet Most power leads are made with three core cable so the ground connection will not be used Power lead connection table Connection UK nternational USA Earth Ground Yellow Green Green Neutral Blue White Live Line Brown Black If using a fused plug ensure that it is fitted with a 3 Amp fuse The instrument can be powered from 85 265 Vrms a c at 50 60 Hz The battery will charge as long as the mains supply is connected except when a test is in progress The power On Off button has a green LED which illuminates when mains power is present For optimum battery life charge the battery after each use A completely exhausted battery will take 14 hours to recharge INSTRUMENT CONTROLS AND INDICATORS Line USB RS232 Measurement terminals input ve guard ve Time A and selectors Voltage A Line input Y
11. 01 F 1 214 331 7399 E ussales megger com Megger products are distributed in 146 countries worldwide This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No 1 1052_UG_en_V02 0806 Www megger com Megger Z A Du Buisson de la Couldre 23 rue Eug ne Henaff 78190 TRAPPES France T 33 0 1 30 16 08 90 F 33 0 1 34 61 23 77 E infos megger com Megger Pty Limited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com Megger Megger Limited 110 Milner Avenue Unit 1 Scarborough Ontario M1S 3R2 Canada T 1416 298 9688 Canada only T 1416 298 6770 F 1416 298 0848 E casales megger com
12. 45 and 60 seconds After 60 seconds at minute intervals up to 10 minutes After 10 minutes results are recorded at 5 minute intervals until the test terminates At each interval the recorded data will contain selected voltage test time elapsed voltage applied leakage current and insulation resistance Downloading results Connect the instrument to the RS232 USB port of a PC running Download Manager Refer to section RS232 USB connection for set up details Start Download Manager on your PC select the 1 1052 driver and right click the icon Select Download Switch the instrument on and wait until initialisation is complete Press the function key along with the record key The instrument now displays dld to indicate download mode Press and hold down test button until download begins shown by analogue display lighting clockwise Results will not be erased during this operation and so may be downloaded repeatedly Deleting test results Switch the instrument on and wait until initialisation is complete Hold down the function key and press the record key twice The instrument now displays clr to indicate clear mode Press and hold down test button until clear process begins shown by analogue display lighting anti clockwise Press the MODE button to exit without deleting the results 11 Recording to a PC While carrying out a test the instrument will output the test voltage test current and resistance
13. AR capacitance time constant and DD values are also stored if available at the end of the test Megger Download Manager may be used to transfer this data to a PC Data output Real time serial data output once per second of the test voltage test current and resistance 19 ACCESSORIES Lead set Three flexible silicon insulated leads with compact clamp Safety Meets the requirements of EN61010 1 2001 CAT III 300V EMC Meets the requirements of EN61326 1 1998 for use in heavy industrial areas Operating temperature 10 C to 50 C Storage temperature 25 C to 65 C Ingress protection lid closed IP65 Humidity 90 RH non condensing at 40 C Dimensions 305 x 194 x 360 mm 12 x 7 6 x 14 2 inches Weight 7 1 kg 16lb approx 20 Included accessories 3m lead set User guide on CD ROM Optional accessories 3m lead set with straight jaw clamps 15m lead set 3 m screened lead set 10 kV 15 m screened lead set 10 kV 3 m lead set 10 kV large insulated clips 3 m lead set 6 kV medium insulated clips 3 m lead set 1 kV insulated clips Other lead types are available on request Order code 8101 181 6172 988 6220 797 8101 183 6220 834 6220 833 6220 811 6220 820 6220 822 REPAIR AND WARRANTY The instrument contains static sensitive devices and care must be taken in handling the printed circuit board If an instrument s protection has been impaired it should not be used but sent for
14. Figure 1 The result of an insulation resistance test IR Test settings T1 and T2 times set in order to measure the DAR Test conditions test runs for longer than 10 minutes as this is required for a PI reading me way iy a iu ou Gis tu a Press Q I TUF ic LJ LI Press Q I 1 T2 im 10m faa Fag 4a9 db QA a ame ro sJ 5 ie i co c Figure 2 The result of a polarity index test PI Test settings T1 and T2 times set in order to measure the DAR Test conditions timer defaults to 10 minutes as this is required for a PI reading a on oo ate t pad pa o 4668 448 4859 ag Press Q I Ltt a Lo DAR mn Liu TI lt EX Press Q I Press Q I N mom TJ co 5 A Lt pA Ti T2 1m 10m 1m in wi wn fu c Lit EE A mg EA Figure 3 The result of a dielectric discharge test DD Test settings T1 and T2 times set in order to measure the DAR Test condition test runs for longer than 10 minutes as this is required for a PI reading l A a p me Lo pr amy Lo O 1m 2m 3m 4m MoT oo moe mmr C44 T Fs 44 CLS Ls Press Q I Press Q I rir E a im 2 3m 4m 1m 1 tt mn un Lh hy 4 CLES oar Figs Figure 4 The result of a step voltage SV test Test condition timer defaults to 5 minutes and test voltage defaults to 1000 V button Pressing this button toggles the display backlight on and off Fn button The function
15. Megger S1 1052 10kV Digital Insulation Tester USER MANUAL Neier WARNINGS Safety Warning must be observed during use m The circuit under test must be switched off de energised isolated and checked to be safe before insulation test connections are made Make sure the circuit is not re energised whilst the instrument is connected m Circuit connections must not be touched during an insulation test m After completing a test capacitive circuits must be completely discharged before disconnecting the test leads Capacitive charges can be lethal m Tested items should be firmly shorted out with a shorting link after discharge until required for use This is to guard against any stored dielectric absorption charge subsequently being released thereby raising the voltage to potentially dangerous levels m The voltage indicator and automatic discharge features should be regarded as additional safety features and not a substitute for normal safe working practice m It is rare but in certain circumstances breakdown of the circuit under test may cause the instrument to terminate the test in an uncontrolled manner possibly causing a loss of display while the circuit remains energised In this event the unit must be turned off and the circuit discharged manually m Test leads including crocodile clips must be in good order clean and with no broken or cracked insulation m The instrument should not be used if any part of it is damaged m Wa
16. SB port ensure that the USB driver supplied on the accompanying product CD has been installed BEFORE connecting the instrument Installation instructions are also to be found on the CD Programmes such as Megger Download Manager may be used to download the results stored in memory Programmes such as Microsoft HyperTerminal may be used to record real time data Battery bar graph This is a battery symbol on the LCD display comprising 4 pairs of segments The battery is monitored continuously when the instrument is turned on The charge remaining in the battery is shown in the table ULL Tests cannot be started and the battery may fail at any time A xY L Symbol flashes when there is not enough charge for a test The MIE 7 below Fully charged battery 50 charged battery instrument then turns itself off When mains power is present the indicator shows the battery is being charged by animating the segments of the bar graph Voltage at terminals The test voltage will default to that selected in the previous test If the instrument has been switched off since the previous test the test voltage defaults to 250 V If there is an external voltage greater than 80 V present this will be displayed regardless of changes made to the test voltage In this case the instrument will not perform a test The high voltage warning indicators flash and the beepr sounds to warn of the hazard until the external voltage becomes less than 50
17. an analogue meter movement to give the user a better The display is also used to indicate how result download and deletion of results is progressing VA AND V Sets voltage Show set to 500V voltage Secondary display r p j Increase Display set time Select main Display time This part of the display shows the results of time resistance method tests ames pay decrease the on main timer timer T1 or T2 set for main time of the briefly timer T1 or TIDARIm T2PI m imTC3m 4m 10m i Za TA AND T Reset timer to Display set Reset selected Display set 058 2566 2586s BBErr a timer briefly timer briefly Select Test Cycle through Mode IR modes Cycle through Cycle through results display results display of last test of current completed active test Record Turn recording Select On Off download or clear stored data VA and VY represent the test voltage buttons TA and TV represent the timer buttons 14 TEST MODE SUMMARY Press the MODE button to cycle through and select the test mode Modes of test to be chosen from include an insulation resistance IR test a polarization index PI test a step voltage SV test and a dielectric discharge DD test If timers T1 and T2 are set the instrument will automatically calculate the dielectric absorption ratio DAR of the insulation PI DAR and IR values are automatically stored and displayed i
18. ctions following should Voltage at terminals 13 be followed under all circumstances Failure to follow these instructions Timer indicator 13 could result in damage to the instrument and or a hazard to the operator Digital display 13 Analogue display 14 The word should is used to indicate that the instructions indicate best Secondary display 14 practice Pre Test during test key action table 14 Test mode summary 15 Insulation resistance IR test 15 INTRODUCTION General Description The S1 1052 is a microprocessor controlled 10 kV insulation tester offering measurement capability of up to 35 TQ The instrument performs automatic tests and has data storage and data retrieval facilities Polarization index and dielectric discharge tests are performed automatically and test duration and voltages can be adjusted according to user preference for these tests A step voltage test can be performed automatically with a default voltage of 1 kV and test duration of 5 minutes It is possible for the user to set different voltages and test durations for the step voltage test The S1 1052 can be powered from the mains supply or by its own internal rechargeable battery which provides for at least 4 hours of continuous testing A battery level indicator on the LCD display indicates battery capacity Connecting power to the mains supply connector will automatically charge the battery whether the instrument is switched on or off except
19. every second Refer to section RS232 USB connection for setup details Connect the instrument to the RS232 USB port of the PC The data may be captured with Microsoft HyperTerminal or another suitable programme High voltage warning LED This is a red LED next to the TEST button on the front panel The LED flashes when the voltage on the test inputs exceeds 50 V Line input present LED This is a green LED next to the power On Off button on the front panel It is illuminated whenever the mains power is connected Test terminals There are three test terminals marked and G These terminals are designed to accept only the test leads supplied Shutters across the terminals prevent accidental ingress of dirt and other objects Test lead plugs interlock with the shutters and are released by rotating the test lead plug a quarter turn The Guard terminal is explained below and is only used in cases where surface leakage currents need to be eliminated Most measurements use just the and terminals The instrument s internal voltage generator drives the terminal with respect to the terminal current being measured in the terminal Guard terminal For basic insulation tests and where there is little possibility of surface leakage affecting the measurement it is unnecessary to use the guard 12 terminal i e if the insulator is clean and there are unlikely to be any adverse current paths However in cable testing for
20. f the data is available irrespective of the selected test mode At the end of a test the instrument can be made to display either the insulation resistances insulation currents or ratios plus capacitance measurements by using the Q T toggle button See section Q I button for cycling through results and toggling units Insulation Resistance IR test This is the default mode in which the instrument powers up This test mode measures insulation resistance continuously at the selected voltage The test voltage may be varied during an IR test by pressing the test voltage A or W buttons The test duration can be set using the main timer The test will finish automatically after this time has elapsed On test completion insulation capacitance and the time constant associated with it is calculated and displayed Time Constant TC Rins X Cins If timers T1 and T2 are set the instrument will calculate and display the DAR value under the segment DAR On completion of the test the instrument will display the insulation resistance measured at these times under the segment symbols T1 and T2 If the test runs for longer than 10 minutes the instrument will calculate the polarisation index This value will be displayed under the display segment symbol PI On completion of the test the instrument will display the insulation resistance recorded at 1 minute and 10 minutes under the segment symbols 1m
21. g the Q I toggle button See section Q I button for cycling through results and toggling units Dielectric Absorption Ratio DAR Ry min Rr min Dielectric discharge DD test The DD test is a diagnostic insulation test that allows ageing deterioration and voids in the insulation to be assessed The result is dependent on the discharge characteristic so the internal condition of the insulation is tested largely independent of any surface contamination On discharge the capacitive component of the discharge current decays from a high value with a relatively short time constant of a few seconds The other current component comprising the released absorption current decays from a lower value with a relatively long time constant of up to several minutes If this component of the discharge current is large gt 7 500 V test voltage then the insulation condition is poor The main timer will default to 30 minutes which is normally sufficient time for full absorption to take place in an insulation material The default test voltage is set to 500 V The DD test requires the instrument to measure the discharge current 1 minute after the removal of the test voltage At this time the capacitive current should be insignificant compared with the released absorption current On completion of the test the instrument uses this measurement along with the test voltage and calculated capacitance to produce a figure of merit
22. indicating the quality of the insulation Dielectric Discharge DD J min VxC where I is the measured current expressed in milliamps mA V is the test voltage in Volts V and C is the measured capacitance in Farads F Measurements above 100 GQ Measurements up to 100 GQ can be made without any special precautions assuming that the test leads are reasonably clean and dry The guard lead can be used to remove the effects of surface leakage if necessary When measuring resistances above 100 GQ the test leads should not be allowed to touch each other or any other object since this will introduce leakage paths Sharp points at the test lead connections should also be avoided since this will encourage corona discharge The output is isolated and so will float relative to ground such that the positive terminal is at plus half of the test voltage and the negative terminal is at minus half of the test voltage with respect to ground Leakages therefore occur between the positive terminal and ground between the negative terminal and ground and directly between the positive and negative terminals These leakages have a significant effect and can occur through the air itself Test V E Test V 2 aare 2 a a en eet I a A a a a A a sl If the guard lead is connected to ground then since the negative terminal is at the same voltage as the guard terminal the leakage into the negative terminal will be considerably reduced Thi
23. ndicated with flashing high voltage warning indicators Testing is disabled if the external voltage exceeds 80 V Testing will stop if the test start stop button is pressed again the preset test time is reached or if the unit is not in burn mode insulation breakdown is detected When a test has finished the instrument will discharge the load which may take some time The operator must always check the load has been discharged before touching the test leads O I button Pressing this button toggles the digital and secondary displays The details available when scrolling the secondary display will depend upon the test mode selected whether timers T1 and T2 have been set and the duration of the test The digital display toggles between insulation resistance and current In the IR PI and DD modes the secondary display initially shows the PI polarity index DAR dielectric absorption ratio and on completion 1 of the test the TC time constant and capacitance measurements m Toggling the display shows insulation resistances and currents In the SV step voltage mode the secondary display toggles between ee m AA rn in m mn F insulation resistances and currents GLOLt GLL AJS LILIn Figures 1 to 4 illustrate the display status for sequential Q I key presses in a oe Press Q I the different modes Press Q I wae BBR SEB dh mga 440 EIE lm min a ee T T2 1m 10m Oe Di p2 oo EMM
24. on to enable the Service Department to prepare in advance for receipt of your instrument and to provide the best possible service to you m Model e g S1 1052 m Serial number to be found on the underside of the case or on the calibration certificate m Reason for return e g calibration required or repair m Details of the fault if the instrument is to be repaired 2 Make a note of the RA number A returns label can be emailed or faxed to you if you wish 3 Pack the instrument carefully to prevent damage in transit 4 Ensure the returns label is attached or that the RA number is clearly marked on the outside of the package and on any correspondence before sending the instrument freight paid to Megger Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs In the case of instruments requiring repair outside the warranty period an immediate quotation can be provided when obtaining the RA number 5 You may track the progress of your return on line at www megger com Approved Service Centres A list of Approved Service Centres may be obtained from the UK address above or from Megger s website at www megger com Megger Limited Archcliffe Road Dover Kent CT17 9EN England T 44 0 1 304 502101 F 44 0 1 304 207342 E uksales megger com Megger 4271 Bronze Way Dallas Texas 75237 1019 USA T 1 800 723 2861 USA ONLY T 1 214 333 32
25. s reached Readings for the first 4 recorded values are displayed under the consecutive segment headings 1m to 4m The 5 minute reading is displayed by the main display If the range of measured insulation between readings is too wide for the instrument to display then those readings too small compared to the final reading will be represented by Polarisation index PI test and dielectric absorption ratio DAR test The PI test is a particular example of a time resistance method which takes the ratio of the insulation measured at 1 minute and at 10 minutes Good insulation generally shows an increase in resistance over a 10 minute period Readings for contaminated insulation are fairly constant because 16 any absorption effects are masked by high leakage currents On completion of the test the polarisation index is displayed under the segment heading PI Polarisation Index PI Ryg min Ry min The Dielectric Absorption Ratio is the term applied to the polarisation index using other time intervals set by T1 and T2 If timers T1 and T2 are both set then the insulation resistance measured at these times is also recorded These are displayed together with the calculated dielectric absorption ratio under the T1 T2 and DAR segments respectively The instrument can be made to display either the insulation resistances insulation currents or ratios plus capacitance measurements by usin
26. s testing at 10 kV Test voltages 250 V 500 V 1 kV 2 5 kV 5 kV 10 kV ranges adjustable in 10 V steps from 50 V to 1 kV and 25 V steps from 1 kV to 10 kV Accuracy 23 C 10 kV 5 2 TQ 20 20 TQ Guard 2 error guarding 500 KQ leakage with 100 MQ load Display range Digital display 10 kQ to 35 TQ 3 digits Analogue display 100 kQ to 1 TQ Short circuit charge current 5mA 10 kV Capacitor charge time lt 3 seconds per uF at 5mA to 10 kV Capacitor discharge time lt 250 ms per uF to discharge from 10 kV to 50 V Capacitance measurement 500 V minimum test voltage 10 nF to 50 uF dependent on test voltage Capacitance measurement accuracy 23 C 5 5 nF Voltage output accuracy 0 C to 30 C 4 0 10 V of nominal test voltage at 1 GQ load Current measurement range 0 01 nA to 5 mA Current measurement accuracy 23 C 5 0 2 nA at all voltages Interference rejection 1 mA per 600 V up to a maximum of 2mA Timer range Counts up to 99 minutes and 59 seconds from start of test 15 second minimum setting for test voltage 1000 V 30 second minimum setting for test voltage lt 1000 V Test regimes Auto IR PI SV DD DAR is calculated automatically if timers T1 and T2 are set Interface RS232 38400 Baud 8 data bits 0 parity 1 stop bit no flow control USB Data storage Data stored selected voltage test time elapsed voltage applied leakage current and insulation resistance The PI D
27. s will improve accuracy because the current flowing into the negative terminal is measured by the instrument and used to calculate resistance This technique is only permissible if the item under test is isolated from ground Isolated in this context means insulated by a resistance of at least 5 MQ for the positive 17 18 terminal or at least 10 kQ for the negative terminal Conversely if the positive terminal is grounded then the negative terminal will be at a voltage equal to the test voltage relative to ground which will result in an increase in leakage current and worsening of measurement accuracy Test V Ground When making measurements above 100 GQ therefore the user should ground the Guard Lead where possible otherwise parallel leakage paths may occur Alternatively screened leads are available as an optional accessory from Megger The lead to the negative terminal is fully screened The screen is plugged into the Guard terminal diverting any stray leakage currents This considerably improves measurements made with a floating output where the leads might touch each other or anything other than the test piece Circuit block diagram Discharge resistance Cable under test For 5 kV instruments C1 47 nF R1 50 kQ R2 40 kQ For 10 kV instruments C1 15 nF R1 156 kQ R2 110 kQ SPECIFICATIONS Voltage input range 85 265 V rms 50 60Hz 60 VA Battery life 4 hours continuou
28. ter on the surface of the instrument may lead to erroneous results It is recommended that the instrument is not used in wet weather conditions m This instrument is not intrinsically safe and must not be used in hazardous atmospheres NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS CONTENTS Safety warnings 2 Breakdown mode burn mode 15 Introduction 4 Alarm limit mode 15 General description 4 Step voltage SV test 16 Features 4 Polarisation index PI test and dielectric absorption Cleaning 4 ratio DAR test 16 Power lead and battery charging 5 Dielectric discharge DD test 16 Instrument controls and indicators 6 Measurements above 100 GQ 17 Power On Off button 7 Circuit block diagram 18 Test voltage A and W buttons 7 Specifications 19 Test start stop button 7 Accessories 20 Q I button 7 Repair and warranty 21 button 10 Fn button 10 Symbols used on the instrument are Mode button 10 Timer and Y buttons 11 A Caution risk of electric shock Record button 11 Recording to on board memory 11 A Caution refer to accompanying notes Downloading results 11 ol Deleting results 11 Equipment protected throughout by Double Recording to a PC 12 Insulation Class II ae ee F C Equipment complies with current EU directives Test terminals 12 Guard terminal 12 RS232 USB connections 13 Terms used in this manual Battery bar graph 13 The word must is used to indicate that the instru
29. ween 50 V and 10 kV can be selected by holding down the Fn function button whilst operating the buttons The selectable voltage is adjustable in 10 V steps between 50 V and 1 kV and adjustable in 25 V steps between 1 kV and 10 kV An auto repeat facility is enabled when the button is held down allowing faster travel through the range If there is an external voltage greater than 50 V on the test leads the high voltage warning indicators are flashed and the display shows this voltage instead The instrument will not perform a test if this voltage is greater than 80 V During a test the display shows the actual voltage on the test leads If the test voltage is changed during a test the new test voltage will be displayed briefly When the test has stopped the display continues to show the voltage present on the test leads Pressing either test voltage A or V button will then display the test voltage immediately before the end of the test Test start stop button A test will only start if this button is pressed held and then released as soon as the red high voltage warning indicator LED lights The LCD and red LED high voltage warning indicators flash when the test starts A test will not start if the button is released before the red LED shows or pressed continuously for longer than 5 seconds This is a safety feature to prevent a test being started inadvertently The presence of a voltage greater than 50 V on the test leads is i
Download Pdf Manuals
Related Search