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1. tosta senses sensns essen seen seta son 26 1 SAFETY CONSIDERATIONS Procedures of circuit breaker installation and disassembly must be carried out in dead condition of the circuit breaker The busbars supplying the main circuit of the circuit breaker must be disconnected and earthed Removing inspection and installation of arc chutes must be carried out after the busbars supplying the main circuit of the circuit breaker are disconnected and earthed Installing commissioning maintaining or changing these appliances must be carried out only by qualified and suitably trained specialist personnel and under strict observation of national and international safety regulations Do not carry out any setting operations on the circuit breaker if its main circuit is live Do not use the manual drive lever of the circuit breaker if its main circuit is live When installing an arc chute follow the wiring instructions on the arc chute wall Do not touch the holding coil and drive terminals stabilizer terminals auxiliary switches or control panel terminals if control voltages are applied Do not use arc chutes for operation with other than rated voltage Do not supply control circuits with higher voitage than determined by their parameters When connecting DC control circuits maintain polarity according to the diagrams and markings on the terminal strips of the holding coil electromagnetic drive st
2. proceed as follows unscrew the connector terminals 62 from the solenoid valve coil 67 unscrew the screw 63 fastening the coil core 66 unscrew the 2 screws 69 fastening the keeper limiter 68 to the solenoid valve body 70 remove the keeper 65 and the keeper limiter 68 unscrew the coil core 66 with a 22 wrench replace the solenoid valve coil 67 After replacement follow the same procedure in reverse order and set the play levels of the keeper as follows play level b set play level b 0 5 mm by moving the armature limiter 68 After setting tighten the screws 69 play level a press the armature to the coil core with your fingers and set play level a 1 mm with the screw 61 13 CHUTE MAINTENANCE DURING OPERATION NOTE When removing inspecting and installing of arc chutes the circuit breaker must be disconnected on both sides and grounded 13 1 MAINTENANCE OF ARC CHUTES KBS 0 6 AND KBS 0 8 Arc chute inspection Arc chute inspection must be carried out at least once a year If no considerable signs of arc chute wear such as pearling sootiness at internal sides of the walls burn out of wedge ferrules external wall or middle plate cracking are found then the arc chute operation can be continued If considerable signs of wear occur disassemble the arc chute evaluate its condition and if necessary regenerate it After each repeated switching off occurring as a result
3. 2400 4800 3000 6000 4000 8500 Over current releases operation tolerances 15 without holding current stabilizer 2 with holding current stabilizer Overload capability The table below shows the times for reaching the permissible temperature rise limits of the most hot parts with the following over currents 1 2 x INe 2 x INe 3 x INe The overload tests were made for the circuit breakers with the rated currents 2000 2500 and 3150 A for two operating modes temperature rise test from a cold state the circuit breaker had not been working before the overload test temperature rise test from a steady state the circuit breaker had been loaded with rated current before the overload test Table 3 Overload capability circuit breaker 2000 2500 and 3150A Circuit breaker rated current ve 2000A 2500 A 3150 Overload from cold state 1 2 X l Ne 2h 2h 2h Time 2XlNe 10 min 6 min 10 min 3Xl we 40s 30s 35s Overload from steady state 1 2 X we 20 75 min 40 min Time 2Xlwe 10s 30s 60s 3 Xl ue 4s 7S 9s Types of arc chutes KBS 0 6 KBS 0 8 gap chutes for tram and underground switchboards KBD 1 5 chutes for use in power supply systems for suburban railways hoisting machines etc KBD 3 50b chute for typical sub stations and sectioning cabins KBDk 3 50b chute with a lower height for sectioning cabins with draw out sw
4. 89 and fit it to the core tighten the M12 screws 88 91 fastening the core yoke 89 The overcurrent release range can change slightly as a result of coil replacement So it is recommended to check that range When checking the release the value of the voltage supplying the current stabilizer should be as in table 12 and 40 operating contact force should be 260 2 N The range of release operation can be corrected with the threaded core 90 12 2 2 CIRCUIT BREAKER BWS WITHOUT HOLDING CURRENT STABILIZATION FIG 19 In order to replace the holding coil in the BWS circuit breaker without holding current stabilization proceed as follows unscrew the wires from the coil terminals 16 unscrew the two M12 screws fastening the core yoke 89 disassemble the core yoke 89 2 02 replace the coil 16 install the core yoke 89 and screw it with the two M12 screws screw the wires to the coil terminals maintain polarization when connecting the power leads The overcurrent release range can change slightly as a result of coil replacement So it is recommended to check that range When checking the release the value of the holding coil current should be as in table 12 and the operating contact force should be 260 20 The range of release operation can be corrected with the threaded core 90 precisely and non magnetic separators 95 flux attenuation Table 12 Checking overcurrent releases in
5. BWS circuit breakers test current values for holding coils depending on holding system rated voltage Rated voltage of holding system Holding coil current Remarks 48V DC 2 1ADC 55V DC 1 75A DC 110V DC 0 9A DC circuit breaker without holding current stabilizer 220V DC 0 45A DC 660V DC 0 15A DC 220V AC 04A AC 110V AC or DC 0 56A DC circuit breaker with holding current stabilizer 220V AC or DC 0 28A DC current on the AC side 12 3 CLOSING COIL REPLACEMENT In order to replace the closing coil 47 proceed as follows unscrew the wires from the coil terminals unscrew the four M10 nuts clamping the front steel plate 53 of the drive and disassemble it replace the coil 47 with a new one install the front steel plate 53 and tighten the four clamp nuts connect the power leads to the coil terminals 47 maintaining proper polarization 12 4 SOLENOID VALVE REPLACEMENT FIG 9 In order to replace the solenoid valve 60 proceed as follows unscrew the connector terminals 62 from the solenoid valve coil 67 unscrew the two M8 screws clamping the solenoid valve to the electro pneumatic drive body 56 replace the solenoid valve tighten the solenoid valve 60 to the drive body 56 connect the terminals of the connector 62 203 x 12 5 REPLACEMENT OF THE SOLENOID VALVE COIL FIG 9 In order to replace the solenoid valve coil
6. OF REPLACEABLE AND SPARE PARTS FOR CIRCUIT BREAKER AND ARC CHUTES 11 1 REPLACEABLE PARTS FOR CIRCUIT BREAKER fixed contact 3150 A 28 fixed contact 2500 A 28 fixed contact 2000 630 A 28 narrow fixed contact 2500 A 28 narrow fixed contact 2000 A 28 narrow fixed contact 2000 630 A 28 moving contact 3150 A 31 moving contact 2500 A 31 moving contact 2000 630 A 31 10 narrow moving contact 3150 A 31 NO OU RO N gt O 11 narrow moving contact 2500 A 31 12 narrow moving contact 2000 630 A 31 13 arc chute KBD 3 50b 23 14 arc chute KBDk 3 50b 23 15 arc chute KBDd 3 50b 23 16 arc chute KBDp 3 50b 23 17 arc chute KBD 1 5 23 18 arc chute KBS 0 8 23 19 arc chute KBS 0 6 23 11 2 REPLACEABLE PARTS FOR ARC CHUTES ARC CHUTES KBD 3 50b KBDk 3 50b KBDp 3 50b KBDd 3 50b 20 short deionization plate insulating plate 114 113 21 long deionization plate insulating plate 115 113 22 insulating plate 113 ARC CHUTES KBD 1 5 23 deionization plate 111 11 3 SPARE PARTS FOR CIRCUIT BREAKERS 24 special contact screw 196 25 arc horn for arc chutes KBD 3 50b KBDk 3 50b KBDd 3 50b KBDp 3 50b 27 26 arc horn contact shield for arc chutes KBS 0 6 KBS 0 8 27 27 arc horn contact shield for arc chutes KBD 1 5 27 28 right tray 43 29 left tray 44 30 insulating shield 41 31 insulating rings 42 32 cover plate for arc chute
7. U1 U2 U2 U3 U3 Fig 20 BWTS control board 55 110 220 V DC diagram Fig 21 control board 220 V AC diagram 44 Signalling Fig 22 BWTS B control board 110 220 V DC diagram Signalling BWTS B control board 220 V AC diagram Fig 23 45 BPE 31A Fig 24 BWTS N control board 220 V DC diagram BWTS N B Signalling Fig 25 BWTS N B control board 220 V DC diagram 3465 Fig 27 KBD 1 5 Arc Chute 8 6 e iV W 21 E NN 87 M RA 113 Y m Sree me ALL N ET 115 116 1077 T17 118 119 120 Fig 28 KBD 3 50b Arc Chute 48 Nowa sp 2 0 0 CERTYFICATES 43 300 Bielsko Bia a ul Leszczy ska 6 Tel 48 33 11 80 10 Fax 48 33 12 21 74 ISO 9001 654 206 apena pl Telegram Apena Bielsko e mail apenaQapena com pl ISO 14001 GERMANISCHER LLOYD POLSKI REJESTR STATK W
8. arm 6 that pushes the keeper 7 connected to it to the core 18 The moving contact 31 is then about 6 mm away from the fixed contact 28 when contacts are new and 10 mm away when contacts are worn After power supply to the drive coil 47 is disconnected the moving contact 31 turns around the axis 93 the action of contact springs 33 and it lies down on the fixed contact 28 with a pressing force of 260 N The speed at which the contacts are closed depends on the speed at which the drive plunger 48 withdraws and the place of support of the moving contact arm 6 by the withdrawing insulating pusher assembly 86 In order to obtain adequate speed of withdrawing in respect of the drive plunger 48 a copper sleeve and a shunt diode for the drive coil are used in the coil 47 They cause slowing down of magnetic flux decay 10 Additionally the construction of the insulating pusher assembly 86 causes a change in the fulcrum of the moving contact arm 6 at the end phase of closing when the distance between the moving contact 31 and the fixed one 28 is about 2 mm for new contacts Shifting down the fulcrum of the moving contact arm 6 changes the kinematics of the contact system due to this the movement of the moving contact arm 6 is even slower when closing the circuit breaker and the circuit breaker is opened faster when closing the circuit breaker by short circuit Note Supply voltage of a DC drive mus
9. condition and if necessary regenerate it After each repeated switching off occurring as a result of several hard short circuits in short few seconds time intervals arc chute inspection is suggested and if necessary it should be disassembled to evaluate its wear condition Arc chute wear condition evaluation and regeneration Arc chute right and left walls Clean the surfaces of the right and left walls with a scraper to remove pearling copper tarnish and carbon black while using a vacuum cleaner to remove dust arising at the same time Negative horn of arc chute Remove the remaining contact material from the horn which settles there during switching off Deionization plates Immobilize loose deionization plates in left wall holes by fixing them again after previous projection upset or twist Deionization plates must not touch each other and should be seated perpendicular to the plane of the wall Replace the burnt deionization plates with new ones Arc chute release for operation Make sure that the arc chute after screwing is seated correctly in the insulating tray of the circuit breaker and that the flexible cable is connected in accordance with the drawing placed on the arc chute Carry out a voltage test on the circuit breaker with 5 kV 50 Hz 1 min voltage 13 3 MAINTENANCE OF CHUTES KBD 3 50b 3 506 KBDp 3 50b KBDd 3 50b Arc chute inspection Arc chute inspection must be carried out at least once a
10. continuous operation 6 3 CLOSING CIRCUIT BREAKERS WITH HAND LEVER During inspection or setting a circuit breaker can be closed with a hand lever 36 For this purpose the bent end of the hand lever is placed into a hole in a front plate 53 electromagnetic drive Pressing the hand lever down results in a shift of the plunger 48 just as while electromagnetic closing In the case of electropneumatic drive a clamping screw M6 for a flap 55 must be loosened and then the flap must be moved Insert the hand lever 36 into a hole exposed in this way and press it down to move a insulating pusher assembly 86 Note Due to safety considerations a circuit breaker must not be closed manually if its main circuit is live 6 4 TRIPPING OUT A circuit breaker opens automatically if the current flowing in the main circuit according to the polarity indicated on the circuit breaker exceeds a value set on the overcurrent release 6 5 INTENTIONAL OPENING A circuit breaker can be opened intentionally by cutting off electric current in the holding coil 16 supply system 11 6 6 CIRCUIT BREAKER CONTROL USING CONTROL BOARD A circuit breaker can be controlled with one of the following control boards BWTS a basic control board with electromechanical switches It can be used for all versions of the circuit breaker Supply voltages of the control board can be 55 110 220V DC and 220V AC In the case of the 220V AC control board the
11. core 18 once again 9 3 CONTACT ADHESION INSPECTION New or replaced contacts should adhere to each other with at least 7596 of their surfaces and their contact resistance should not exceed values given in the table 11 An inspection of contact adhesion surface is carried out by insertion of carbon paper with thin sheet of paper between the contacts closing the contacts and evaluation of the traces left on the paper During operation if the contact resistance increases too high file the contacts with a fine file until a proper value of the contact resistance is obtained When filing pay attention that filings do not contaminate the circuit breaker After that blow out the circuit breaker with clean and dry air 9 4 CONTACT GAP ADJUSTMENT IN THE OPEN POSITION OF THE CIRCUIT BREAKER FIG 11 In the open position of the circuit breaker the gap between the fixed 28 and the moving contact 31 should be 35x1 mm for new contacts This is obtained by insertion of suitable shims 79 between the buffer 78 and the frame 3 15 Table 11 Permissible voltage drops in contacts for rated currents of the circuit breaker Circuit breaker rated Test current A Permissible voltage drop Permissible contact current A in a contact mV resisance 10 630 630 20 32 1000 1000 35 35 1600 1600 35 22 2000 2000 40 20 2500 2500 30 12 3150 3150 25 8 9 5 CONTACT GAP ADJUSTMENT IN TRANSIENT CONDITIO
12. current stabilizer lt 150 ms Power consumption of with holding current stabilizer 45 W holding coil without holding current stabilizer 100 W Electromagnetic 55 110 220 600 v DC 220VAC 15 Supply of closing valve coil 24 48 55 110 220 V DC mechanism electro pneumatic air pressure 0 5 MPa electromagnetic voltage 0 8 1 1 16 Md range of closing voltage 0 7 1 25 mecnanism electro pneumatic air pressure 0 7 1 2 17 Duration of switching pulse for closing coil gt 0 65 18 Time from pulse decay to contact closure lt 0 66 j Power consumption of electromagnetic 1600 W closing coil electro pneumatic 12W 20 Number of auxiliary switches 6a 6b or 7a 7b lu 16A U 500V 21 Parameters of auxiliary switches le 4A Ue 500V 15 1 0 5 Ue 220V DC 13 800V without holding current stabilizer 500V with holding current stabilizer for the 3150A circuit breaker 500 switchings 3 for the circuit breaker with an electro pneumatic closing mechanism 0 7 1 25 RELEASE SETTING RANGES Table 2 Release setting ranges Circuit breaker Current setting range rated current 9 9 360 720A 480 960 A 600 1200 A 675 1350 A 600 1200 A 800 1600 A 1000 2000 A 960 1920 A 1200 2400 A 1600 3200 A 2000 4000 A 1200 2400 A 00 4000 A 1600 3200 2000 4000 2000 5000 1800 4000 2400 4800 3000 6000 4000 8500 1800 4000
13. out coils 25 connected in series or in parallel The core 24 has insulation preventing the blow out coil turns 25 from a short circuit and the pole shoes 29 are mounted through insulating brackets 30 to the frame 3 Insulating trays 43 44 an insulating shield 41 and insulating rings 42 protect ionized gases from switch over to the frame 3 A positive terminal 21 of the circuit breaker is connected through the blow out coils 25 to the contact plate 20 to which the fixed contact 28 is screwed An electromagnetic keeper HI with a moving contact arm 6 and a moving contact 31 are borne by control eccentrics 8 in the circuit breaker frame 3 Contact springs 33 are fastened to the moving contact arm 6 The circuit breakers are equipped with keeper shields 77 preventing metal impurities arising from the wear of deionization plates and contacts from penetrating the keeper surface A flexible joint 141 current circuit bars 5 and a over current release coil 15 connect the moving contact arm 6 with the negative terminal 17 of the circuit breaker overcurrent release consists of a coil 15 located inside the holding electromagnet core 18 For a release with upper current setting over 4 kA an inductive shunt 9 with a core constructed from laminations is used and connected in parallel to the coil 15 A sliding core 92 used to adjust the release operation current is placed inside the coil 15 The
14. voltage of the drive and holding system must be 220V AC too BWTS N a control board made using an electronic relay block The control board supply voltage is 220V DC The control board can be used for the circuit breakers where the voltage for the drive and holding system is also 220V DC BWTS B a control board with electromechanical switches and a by pass system Control board supply voltages can be 110 and 220V DC or 220V AC The control board can be used for the circuit breakers with holding current stabilizers where the voltages of the drive and holding systems are also 110 and 220V DC or 220V AC respectively BWTS N B a control board made using an electronic relay block and a by pass system The supply voltage of the control board is 220V DC It can be used for circuit breakers with holding current stabilization where the voltage of the drive and the holding systems is 220V DC The overall dimensions and values of supply voltages for control boards are shown in fig 5 and in tables 9 and 10 Terminal diagrams and schematic diagrams for the control boards are shown in fig 20 25 Each of the boards prevents the so called pumping on short circuit The protection against pumping is based on the following principle If the circuit breaker is closed with a continuous pulse and tripping out occurs the circuit breaker will not switch on again In such a case the circuit breaker can be closed again only after the continuos pulse is cu
15. 60 and cylinder 56 with piston 59 transferring force through the insulating pusher assembly 86 to the moving contact arm 6 The dielectric strength of the drive both the electromagnetic and electro pneumatic one towards the circuit breaker frame is 15 kV however the dielectric strength of the electromagnetic drive coil and the valve coil towards the drive body is 4 kV The circuit breaker is eguipped with an auxiliary switch assembly 2 and mechanical indicator of contact 34 position The arc chute 23 has a bearing system mounted by rotary motion on axis 32 and it rests in an insulating tray 22 6 PRINCIPLE OF OPERATION FIG 19 The operation of the BWS circuit breaker is based on the principle of magnetic holding keeper that is automatic opening takes place when the magnetic flux 9 generated by the current flowing through the coil of the over current release 28 sufficiently weakens the magnetic flux of the holding coil Z When closed the keeper 7 adheres tightly to the core of the holding electromagnet 18 The holding coil 16 generates a magnetic flux flowing through the core 18 89 and keeper 7 The main current flows through the current release coil 15 or part of it in the case of the inductive shunt 9 circuit breaker which generates a flux l going through the keeper 7 however its direction is opposite to that of the holding flux Qy The difference between the fluxes determin
16. ABLE AND SPARE PARTS OF 22 12 1 Contact WO M 22 12 141 Moving contact replacement s xe AA 22 12 1 2 Fixed contact replacement see WY A 22 12 2 Holding coil replacemennt eese eee oo ooo wow wow owo ense __________ ano 22 12 2 1 Circuit breaker bws with holding current stabilization fig 19 e wanna 22 12 2 2 Circuit breaker bws without holding current stabilization fig 19 eua aaa 22 12 3 Closing coil replacement leere aa aa OWO OO OOOO __ 23 12 4 Solenoid valve replacement fig 9 enne enses tosta seta sess sensns enne 23 12 5 Replacement of the solenoid valve coil fig 9 ee eee owa aaa aaa Aa a 24 ARC CHUTE MAINTENANCE DURING 0 0 24 13 1 Maintenance of arc chutes kbs 0 6 and 5 0 8 400 eee oo oo 0000000 24 13 2 Maintenance of kbd 1 5 arc 2 aa eo oo oo oo a oo oo a a aan O aa oo oo oo oo woo ooo o etes ses oo 25 13 3 Maintenance of arc chutes kbd 3 50b kbdk 3 50b kbdp 3 50b kbdd 3 50b 4 77427 25 PACKAGING TRANSPORT STORAGE
17. CIRCUIT BREAKER INSTALLATTION 22 022002000000000000000000000000000000000000o0 owa 14 1 14 CIRCUIT BREAKER od eo nooo a 14 9 1 Adjustment of auxiliary switches fig 10 eee eese esee aa aa aa aa aa aa OOO OWADA 15 9 2 Adjustment the keeper 7 adhesion to the core 18 aa eee eee ense aa atten nennen seta seta ann 15 9 3 Contact adhesion ANS PECHON P oe e da adw 15 9 4 Contact gap adjustment in the open position of the circuit breaker fig 11 eene 15 9 5 Contact gap adjustment in transient condition fig 12 16 9 6 Electromagnetic drive adjustment 4 aan seta aa aa aa sense tassa setas tasa sno 16 9 6 1 Adjustment of the gap between the keeper 7 and the holding core 18 fig 13 16 9 6 2 Lower fulcrum adjustment for the moving contact arm fig 14 sess 17 9 6 3 Adjustment the initial plunger position fig 15 eene 17 9 7 Electro pneumatic drive adjustment 4 eeeeee ooo aa aa sten seta stia aa aa OD taste ao 00000 17 9 7 1
18. ISO 14001 NOWA ena GERMANISCHER LLOYD POLSKI REJESTR STATKOW HIGH SPEED CIRCUIT BREAKERS BWS USER MANUAL Issue 07 2000 No 00 18 CONTENTS SZYN WA 10 11 SAFETY CONSIDERATIONS 12220220200000000000000000000000000000 sioe wow aa aan aan aa P 3 APPLICATION ORA RACOT 4 CHARACTERISTICS ai O kod oco 4 TECHNICAE DATA zz ZOE A W EZ AAA MT ans 5 CONSTRUCTION FIG 6 19 si osz do koneensa a kd Sadie a dada MESA NEN 8 PRINCIPLE OF OPERATION FIG 19 wawa owo 0000000000 a sens 10 6 1 Closing circuit breakers with electromagnetic 0 1120 1 tosta sna 10 6 2 Closing circuit breakers with electro pneumatic ana amo aamen ne 11 6 3 Closing circuit breakers with hand 1 24 24 4 1 90 0 4 40 OO OOOO OO ana 11 64 11 6 5 JIntentional opening sosie OOO o i Vv ue Pod VK eg 11 6 6 Circuit breaker control using control board eee eee 12
19. Lower fulcrum adjustment for the moving contact arm 2 0 e aaa aaa aaa nennen enn 17 9 7 2 Adjustment the initial piston 59 position fig 16 esses 18 9 7 3 Adjustment the contact closing speed eee a eau n aaa aaa aaa nn nnne 18 9 8 Setting the contact force fig 17 6 vessassa d ii owak doen 18 ARC CHUTE zc Nz Wa w R aaa ez zoo 18 10 1 Construction and principle of operation of the arc chutes kbs 0 6 and kbs 0 8 fig 26 19 10 2 Construction and principle of operation of the arc chute kbd 1 5 fig 27 ceres 19 10 3 Construction and principle of operation of 3 kv arc chute kbdd 3 50b fig 28 19 LIST OF REPLACEABLE AND SPARE PARTS FOR CIRCUIT BREAKER AND ARC CHUTES 20 11 1 Replaceable parts for circuit breaker eese eese eee entente a aa aa a OOO 20 11 2 Replaceable parts for arc chutes eee eee a aan aa 20 11 3 Spare parts for circuit breakers eee aa aa attain sins ens aa aan a aa aa naa tasto seta ao aa sens od ano 20 11 4 Spare parts for arc chutes s sss teer ree dawid 21 12 13 14 REPLACEMENT OF REPLACE
20. N The circuit breaker is fastened to the foundation with four M12 screws An earth terminal with an M12 screw 12 is used to earth the circuit breaker base The protective zone for the earthed parts is given in the table 7 and shown in fig 1 4 Connection busbars should be led to the rear along the longitudinal axis of the circuit breaker They must be connected in accordance with the polarity of the circuit breaker When installing the circuit breaker in a switch board cubicle pay attention to maintain the clearance distances and to the layout of cables or supply busbars After an arc chute is placed on a circuit breaker it is necessary to check the arc chute position 23 in the insulating tray 22 the arc chute must be strictly adherent to the insulating tray Connect the arc chute wires to the circuit breaker according to the instructions on the arc chute Then check the operation of the circuit breaker closing and opening the circuit breaker contacts must not brush against arc chute walls or negative copper arcing horn Set the required value of the overcurrent release with the knob 14 The polarity of the supply circuits of the closing and holding coils must conform to the markings on the terminal strips The control circuits of the circuit breakers with electromagnetic drive can be supplied through one of the following control boards BWTS BWTS N BWTS B or BWTS N B installed separately in a switch board cubicle Before a circuit breake
21. N FIG 12 The contact gap in the transient position is measured between the fixed and moving contact when the keeper is attached to the holding core and the drive is operated This gap is set with a pull rod 82 For this purpose apply supply voltage to the holding coil 16 inserta gauge of thickness 7 mm between the main contacts e using the manual drive 36 bring the keeper 7 to the holding core 18 remove split cotters from the pin 81 e remove the pin 81 from the pull rod 82 loosen the lock nut 80 e turn the pull rod 82 to the left or to the right until the slack is taken in at the side of the moving contact arm 6 between the pull rod 82 and the pin 81 placed in position again e tighten the lock nut 80 Secure the pin 81 with the split cotters at both ends A contact gap of 7 mm in setting condition results in 6 1 mm gap in working condition after the circuit breaker is set completely and closed with electromagnetic or electro pneumatic drive Due to contact wear the gap in transient condition increases and when it reaches 10 mm the contacts should be replaced with new ones A contact gap smaller than 5 mm in transient working condition can result in arc over between the contacts during closing at U 2 3000V particularly when some irregularities occur the worn contact surface 9 6 ELECTROMAGNETIC DRIVE ADJUSTMENT 9 6 1 ADJUSTMENT OF THE GAP BETWEEN THE KEEPER 7 AND THE H
22. OLDING CORE 18 FIG 13 Adjustment of this gap is carried out with a plunger 48 Switch off the supply voltage for the holding coil 16 loosen the lock nut 50 and turn the plunger 48 to the left or to the right until the gap between the keeper 17 and the core 18 is 0 5 mm when pressing the manual drive lever 36 home Then turn the plunger by half turn to the left and tighten the lock nut 50 apply voltage to the drive coil 47 and check if the gap between the keeper 171 and the core 18 is within the range of 0 3 0 5 mm 216 Measure the gap with a feeler gauge If the above mentioned gap is missing then the keeper 7 strikes the core 18 during closing with the electromagnetic drive and this results in circuit breaker maladjustment and damage to the holding surface of the keeper 7 and the core 18 A gap greater than 0 5 mm can result in problems with catching the keeper 7 during circuit breaker closing 9 6 2 LOWER FULCRUM ADJUSTMENT FOR THE MOVING CONTACT ARM FIG 14 Lower fulcrum adjustment for the moving contact arm 6 is carried out with the adjusting screw 84 in the insulating pusher assembly 86 For this purpose loosen the lock nut 83 insert a gauge of thickness 2 mm between the contacts switch on supply voltage for the holding coil 16 and close the circuit breaker Then while loosening or tightening the adjusting screw 84 obtain support of the moving contact arm 6 simultaneously in two point
23. abilizer control boards When setting mechanically do not put your hands into areas of the circuit breaker where injury is possible when the circuit breaker is handled or unintentionally opened When checking the overcurrent release of the circuit breaker at low voltage it is recommended to cover up the contact system in order to get protection from possible rejection of arc and metal particles and from glare by electric arc During arc chute regeneration use a vacuum cleaner to remove the dust arising when the arc chute components are cleaned 2 APPLICATION The BWS type single pole polarized DC high speed circuit breakers are designed for Switching service and overload currents Short circuit protection in traction sub stations and sectioning cabins for long distance trains trams suburban trains underground and on traction vehicles Short circuit protection for rectifiers and thyristor converters in metallurgy mining etc 3 CHARACTERISTICS Operating conditions The BWS circuit breakers are designed for use in rooms at altitudes up to 2000 m above sea level which are free from dust gas and vapour flammable or chemically active The circuit breakers are designed for operation in tropical and moderate climatic conditions Climatic versions The BWS circuit breakers are made in two climatic versions N for use in the climates Cold Temperate CT Warm Temperate WT T for use in the climates War
24. all dimensions The overall dimensions of BWS circuit breakers with arc chutes and dimensions of protective zones are shown in fig 1 4 and in table 7 The various dimensions of BWS circuit breaker terminals are shown in fig 1 and in table 8 Table 7 Dimensions of circuit breakers with arc chutes and arc zones A A1 R1 R2 x1 X2 Y1 Y2 Z1 Z2 Arc chute type mm mm mm mm mm mm mm mm mm mm KBS 0 6 850 425 615 200 500 600 KBS 0 8 850 425 615 200 500 600 KBD 1 5 930 510 720 600 800 900 KBD 3 50b 1365 435 965 1120 150 350 300 500 700 700 KBDk 3 50b 1285 355 890 1055 150 350 300 600 700 1000 KBDd 3 50b 1210 280 820 1000 150 350 300 600 700 900 KBDp 3 50b 1210 280 820 1000 150 350 300 600 500 1000 Table 8 Variable terminal dimensions D E F G H J K L M N P S 0 Rated current mm mm mm mm mm mm mm mm mm mm mm mm mm 630 A 575 30 290 30 26 520 8 50 7 11 1000 A 575 30 290 30 26 520 10 50 13 11 1600 A and 2000 A 720 30 290 30 26 515 26 10 50 15 50 11 2500 Aand3150A 706 10 252 50 50 495 50 20 100 20 100 17 5 CONSTRUCTION FIG 6 19 A circuit breaker base 1 is made of steel sections interconnected with a beam 10 insulated with heat shrinkable film The base 1 has 4 holes of 13 for securing the circuit breaker One
25. bilization in the holding coil and it increases discrepancies in the operation of the overcurrent release Such a condition is treated as an emergency and it means that the stabilizer must be replaced For the control boards BWTS and BWTS B is used an auxiliary switch with operation program A For the control boards BWTS N and BWTS N B is used an auxiliary switch with operation program B 12 Markings used in diagrams fig 20 25 1 18 terminal strip CT holding coil CZ closing coil ST current stabilizer Q1 auxiliary switch of BWS QF MCB K1 contactor K2 K3 relays KF thermal relay 51 push button with NO contact 52 push button with NC contact RF varistor C capacitor D1 diode R resistor D2 D3 bridge rectifiers BPE 31A block of electronic relays Table 9 Overall dimensions of control boards B1 Ci D1 E1 F1 G1 H1 J1 OT Control board mm mm mm mm mm mm mm mm mm BWTS direct current 168 270 240 250 12 13 168 6 5 BWTS alternating current 250 230 230 210 10 8 13 92 6 5 BWTS N 280 280 256 220 12 10 13 145 6 5 BWTS 280 280 256 220 12 13 145 6 5 BWTS N B 280 280 256 220 12 8 13 145 6 5 Table 10 Rated voltage of control boards Control board Rated voltage BWTS 55V DC 110V DC 220V DC 220V DC BWTS N 220V DC BWTS B 110V DC 220V DC 220V AC BWTS N B 220V DC 213 7 CIRCUIT BREAKER INSTALLATIO
26. core is slided with a knob 14 for release current setting The holding coil 16 is equipped with an overvoltage protect system in the form of a varistor connected in parallel to the coil The circuit breaker can be equipped with a holding current stabilizer 13 mounted on the base 1 to make overcurrent release operation independent of fluctuations of the voltage supplying the holding coil 16 Plunger solenoid drive 35 is fastened to the frame 3 through an insulating moulded piece 45 An insulating pusher assembly 86 transfers drive motion on the moving contact arm 6 The drive is equipped with a system slowing down the motion of the contacts during the end phase of closing The system consists of a diode connected in parallel to the coil 47 and a copper sleeve in the coil 47 that performs the function of a shorted coil The diode is mounted on a terminal strip Additionally the construction of the insulating pusher assembly 786 causes a change in the fulcrum of the moving contact arm 6 at the end phase of closing and this results in additional slowing down of the motion of the moving contact arm 6 when closing the circuit breaker and when closing the circuit breaker by short circuit this results in faster opening of the circuit breaker A bumper 51 limits the plunger when the drive is off An electro pneumatic drive can be used instead of the electromagnetic drive The electro pneumatic drive consists of a solenoid valve
27. d 3 50b FIG 28 The arc chute consists of two adjacent constituent chambers electrically connected in series They have an insulating middle partition 125 that is a common wall for both constituent chambers In the constituent chambers are following arcing horns in the first chamber arcing horn with its protection 120 connected to the terminal and internal arcing horn in the second chamber arcing horn connected to the terminal and internal arcing horn 124b Both of these arcing horns are electrically join together with a copper link subassembly 124 The arc guides 119 122 force to run the electrical arc into both inlets of consistent chambers In the upper part of arc chutes are placed deionization 114 115 and insulating plates 113 The insulating partition 125 is ended with a roof 126 preventing a flash over between both chambers The 3 kV arc chutes KBD 3 50b KBDk 3 50b KBDd 3 50b KBDp 3 50b differ in height from each other The 3 kV arc chutes KBD 3 50b KBDk 3 50b KBDd 3 50b are fitted with metallic screen protecting against an influence of external field The arc is extinguished in the deionization plates 114 115 where on each plate arises voltage drop of about 40 V The insulating plates 113 lengthen the arc and improve the breaking capacity During the current breaking in both constituent chambers the arc creates two windings causing an extreme strong magnetic blowout 19 11 LIST
28. es the holding force of the keeper 7 which is pulled off by a spring 33 If the holding force drops below the force from the spring 33 the keeper 7 is pulled off the core 18 and the contacts are opened For the higher ranges of over current releases an inductive shunt 9 is used In a steady state it causes a current flow which is dependent on the resistance of the shunt 9 and release line 15 whereas in a dynamic state of current rise is dependent of their inductances The operating current of the over current release 15 is set by means of a moving core 92 adjusted with an adjusting handwheel 14 The BWS circuit breaker is polarized It means that automatic opening of the circuit breaker resulting from a current higher than the current set on the over current release 15 takes place only when the direction of the main current flow corresponds to the polarity marked on the circuit breaker terminals and the voltage at the holding coil 16 has the polarity that corresponds to the markings at its terminals In the case of current flow in the opposite direction or change in the supply voltage polarity at the holding coil the circuit breaker will not open automatically 6 1 CLOSING CIRCUIT BREAKERS WITH ELECTROMAGNETIC DRIVE After voltage is applied to the drive coil 47 the plunger 48 is pulled to the drive core 49 and it transfers motion with the insulating pusher assembly 86 through a pin 85 to the moving contact
29. horn which settles there during switching off Left beam right beam Clean the beams of contact material tarnish and carbon black and remove the dust Arc chute release for operation Make sure that arc chute is seated correctly in the insulating tray of the circuit breaker and flexible cables are connected in accordance with the drawing placed on the arc chute Carry out a voltage test on the circuit breaker with 10 kV 50 Hz 1 min voltage 14 PACKAGING TRANSPORT STORAGE Circuit breakers and arc chutes are protected from moisture and mechanical damage in transport Avoid sudden shocks and overturn of cases during transport Circuit breakers should be stored in closed spaces that are dry free of dust and chemically active vapours and gases When lifting use the circuit breaker handles 40 and arc chute axis 32 as in fig 18 Be careful not to damage circuit breaker components in particular the insulating trays Circuit breakers must not be exposed to mechanical shocks during transport and storage The surfaces of the keeper 7 and the core 17 are protected with vaseline for transport and storage 206 Earthed elements Insulating elements 742 7 OK X 1000 Xo ye af e 7 5 TON am VN pa lt Sf 2 3 peuM A are i ESSEN K BWS circuit breaker with arc chutes KBD 3 50b KBDk 3 50b KBDd 3 50b G terminal 1600 3150A spacing of circuit breaker mounting holes Vers
30. ion with electro pneumatic closing mechanism terminal 630 and 1000A Fig 1 BWS circuit breaker with arc chutes KBD 3 50b KBDk 3 50b KBDd 3 50b 27 q0g dag einuo YM SMA 70 BH gz j e A 7 77 n LI p vA Sali r BI _ sjuawaje Guqejnsu sjuaweje 28 Fig 9 Earthed elements Insulating elements gm o B BWS circuit breaker with chutes KBS 0 6 KBS 0 8 Earthed elements Insulating elements 242 2 4 Tha imo A c E y 700 X 4 x XI JA AA Z lt Fig 4 BWS circuit breaker with chute KBD 1 5 29 Fig 5 Overall dimensions of control boards oF Fig 6 31 30 29 28 27 BWS circuit breaker general view EWA R EGER 10 V AU y G N 55 O ot 1 2 i ee NNNNNI LLL mw EM Mie AA eR ES TRI 40 41 42 2 18 20 3 13 42 40 Fig 7 BWS circuit breaker the blow out system 21 52 53 Fig 8 BWS circuit breaker the electromagnetic closing mechanism 233 BWS circuit breaker solenoid valve Fig 9 BWS circuit breaker electro pneuma
31. itchboards with insulated cell walls KBDd 3 50b chute with the lowest height for RPS K switchboards with insulated cell walls manufactured by FAE APENA S A KBDp 3 50b chute for vehicles with additional handles 11 for mounting in vehicles Rated short circuit breaking capacity The tests for short circuit breaking capacity were carried out in the cells of switchboards manufactured by FAE Apena S A Table 4 Rated short circuit breaking capacity Type of arc chute Test voltage Time constant Max switching Prospective short circuit current over voltage KBS 0 6 750 V 20 ms 1800 V 100kA KBS 0 8 1030 V 20 ms 2200 V 80 kA KBD 1 5 1875 V 20 ms 3000 V 50 kA KBD 3 50b 3 50b 4000 V 10 ms 7000 V 50 kA KBDd 3 50b KBDp 3 50b Weights of circuit breakers and arc chutes Table 5 Circuit breaker weight without arc chute Circuit breaker with holding current stabilizer Circuit breaker without holding current stabilizer Rated current Circuit breaker weight Rated current Circuit breaker weight 630 115 kg 630 A 125 kg 1000 A 120 kg 1000 130 kg 1600 2000 130 kg 1600 2000 140 kg 2500 3150 A 140 kg 2500 3150 A 150 kg Table 6 Arc chute weight Type of arc chute Arc chute weight KBS 0 6 KBS 0 8 12 kg KBD 1 5 18 kg KBD 3 50b KBDk 3 50b KBDd 3 50b KBDp 3 50b 75 kg Circuit breaker over
32. ith the lock nut after force is set 10 ARC CHUTE The circuit breakers BWS can be equipped with arc chutes of the following types a slotted arc chutes KBS 0 6 KBS 0 8 b arc chutes with deionization plates KBD 1 5 KBD 3 50b KBDp 3 50b KBDk 3 50b KBDd 3 50b The numbers 0 6 0 8 1 5 3 indicate rated voltage in kV The breaking capacity values of the circuit breakers with the above mentioned arc chutes are given in table 4 18 10 1 CONSTRUCTION AND PRINCIPLE OF OPERATION OF THE ARC CHUTES KBS 0 6 AND KBS 0 8 FIG 26 The slot wedge KBS 0 6 and KBS 0 8 arc chutes consist of external plates 104 105 a middle plate 103 splitting the arc chute into two constituent chambers of reduced width a copper arcing horn 102 a hinge 100 with bearing hole a wire 101 connecting the negative terminal 17 with the arcing horn 102 and wedges 106 two in the KBS 0 8 arc chute and three in the KBS 0 6 arc chute In the KBS 0 6 and KBS 0 8 arc chutes arc suppression occurs mainly due to elongation and cooling of the electrical arc burning in the arc chute 10 2 CONSTRUCTION AND PRINCIPLE OF OPERATION OF THE ARC CHUTE KBD 1 5 FIG 27 The KBD 1 5 arc chute consists of external plates 112 110 an arcing horn 109 a hinge 108 with a bearing hole a wire 101 connecting the negative terminal with the arcing horn 109 and deionization plates 10 3 CONSTRUCTION AND PRINCIPLE OF OPERATION OF 3 KV ARC CHUTE KBD
33. m Damp WDr Warm Damp WDa according to the PN E 045455 21 Std idt IEC 721 2 1 Compliance with standards PN EN 50123 1 PN EN 50123 2 PN EN 50163 EN 50124 1 Approvals and certificates PKP Polish State Railways RENFE Spanish Railways Slovak Railways Hungarian Railways BBJ SEP safety mark 4 TECHNICAL DATA Table 1 Technical data 1 Circuit breaker type BWS 2 Rated voltage Une 600 825 1500 3000 V DC Main circuit 4000 V 3 Rated insulation voltage Auxiliary circuits 500 800 1 V 50 Hz 1 min 15 kV 4 Dielectric strength of main circuit insulation 1 2 50 us 35 kV 5 Rated service current ine 630 1000 1600 2000 2500 3150 A 6 Electrical life at Ue 1 25 Une U 1 5 W 1000 operating cycles 2 7 Mechanical endurance 50 000 cycles 8 Making capacity for overload currents S 70 of release setting current 9 Rated short circuit breaking capacity see table 4 10 Opening time di dt gt 0 5 kA ms lt 5ms with holding current stabilizer 110 220 V DC 220 VAC 11 Voltage of holding without holding current stabilizer 55 110 220 V DC 220 VAC 12 Voltage range of holding coil 0 8 1 13 without holding current stabilizer DC supply lt 80 ms Time from holding current m 13 break to circuit opening without holding current stabilizer AC supply lt 250 ms with holding
34. of several hard short circuits in short few seconds time intervals arc chute inspection is suggested and if necessary the arc chute should be disassembled to evaluate its wear condition Arc chute wear condition evaluation and regeneration Middle plate arc chute right and left walls Clean the surfaces of the middle plate and right and left walls with a scraper to remove pearling copper tarnish and carbon black while using a vacuum cleaner to remove dust arising at the same time Negative horn of arc chute Remove the remaining contact material from the horn which settles there during switching off Wedges Clean the wedges and their ferrules of contact material tarnish and carbon black Arc chute release for operation Make sure that the arc chute after screwing is seated correctly in the insulating tray of the circuit breaker and that the flexible cable is connected in accordance with the drawing placed on the arc chute Carry out a voltage test on the circuit breaker with 3 kV 50 Hz 1 min voltage 24 13 2 MAINTENANCE OF KBD 1 5 ARC CHUTE Arc chute inspection Arc chute inspection must be carried out at least once a year If no considerable signs of arc chute wear such as pearling sootiness at internal sides of the walls burn out of deionization plates external wall cracking are found then the arc chute operation can be continued If considerable signs of wear occur disassemble the arc chute evaluate its
35. of these holes is located on a flexible component Flexibility is obtained by a cut made in the base Such a fastening to the foundation eliminates possible stresses that could arise in the circuit breaker when mounting to out of flat foundation and affect the stability of an overcurrent release An earth M12 screw 12 is located on the base Two insulating beams 11 are fastened to the base IM A frame 3 of aluminium alloy is screwed to these beams 11 The beams 11 are the main insulation between the circuit breaker frame 3 and its base 1 providing a dielectric strength of 15 kV The frame 1 is a supporting structure for the basic assemblies of the circuit breaker A holding magnet core 18 and a holding coil 16 are built in the frame 3 The holding coil 16 is sealed with epoxy resin that ensures a dielectric strength of 15 kV and creates insulation between the main and control holding circuit There is a voltaic connection made between the frame 131 and a negative terminal 17 of the circuit breaker A fixed contact assembly is fastened to the frame 3 with two insulating beams 19 These beams create insulation with a dielectric strength of 15 kV between the fixed contact assembly and the circuit breaker frame 3 A fixed contact 28 contact insulating plate 26 arcing horn 27 and chute insulating tray 22 are fastened to a contact plate 20 The blow out system consists of a core 24 two pole shoes 29 and two blow
36. r is put into service remove vaseline from the keeper 7 and core 18 surfaces by rubbing the surfaces with a dry cloth 8 MAINTENANCE Usual wear and tear of circuit breaker contacts and of an arc chute occurs during their operation so they should be checked periodically and replaced if necessary by service personnel To check the degree of contact wear measure the gap between contacts in the transient state as described in point 9 5 If the gap increases up to about 10 mm then the contacts should be replaced with new ones and the circuit breaker should be set as in point 9 The wear of arc chutes is determined visually The construction evaluation of the degree of arc chutes wear and methods of their regeneration are given in point 13 9 ADJUSTMENT The correct adjustment of a circuit breaker is a condition of its reliable operation Apart from the contacts and the arc chute no other parts are subject to major wear however they can suffer from accidental damage or maladjustment of the circuit breaker can occur In such cases replacement of the damaged parts is necessary as well as readjustment of the circuit breaker This should be carried out according to the following description order 14 9 1 ADJUSTMENT OF AUXILIARY SWITCHES FIG 10 Auxiliary switches are set using an insulator 1521 Carry out the following actions loosen the lock nuts 74 the upper one
37. s KBD 3 50b KBDk 3 50b KBDd 3 50b KBDp 3 50b 26 20 33 cover plate for arc chutes KBD 1 5 26 34 cover plate for arc chutes KBS 0 6 KBS 0 8 26 35 insulating tray 3150 2500 A 22 36 insulating tray 2000 630 A 22 37 holding coil 16 38 closing coil IA7I 39 solenoid valve 60 40 solenoid valve coil 67 41 diodeD22 10 12 42 varistor 43 bridge rectifier 44 board with bridge rectifier and varistor 45 LK type auxiliary switch operation program A 73 46 LK type auxiliary switch operation program B 76 47 indicator unit 48 current stabilizer 13 Other components and subassemblies at Customer s request 11 4 SPARE PARTS FOR ARC CHUTES ARC CHUTES KBD 3 50b KBDk 3 50b KBDp 3 50b KBDd 3 50b 49 middle plate 125 50 right wall 117 51 left wall 127 52 minus horn 118 53 right horn 120 54 internal horn 124 55 roof for arc chutes KBD 3 50b 126 56 roof for arc chutes KBDk 3 50b 126 57 roof for arc chutes KBDp 3 50b KBDd 3 50b 126 ARC CHUTES KBD 1 5 58 left wall 59 right wall 60 deionization plate 111 ARC CHUTES KBS 0 6 KBS 0 8 61 middle plate 103 62 right wall 104 63 left wall 105 21 12 REPLACEMENT OF REPLACEABLE AND SPARE PARTS OF CIRCUIT BREAKER 12 1 CONTACT REPLACEMENT If replacement of the main contact is necessary simultaneous replacement of both contacts i e the fixed one 28 and the moving one 31 i
38. s upper one axis 85 and lower one adjusting screw 84 when pressing the manual drive lever 36 and when the circuit breaker contacts are 2mm gauge thickness apart Tighten the lock nut 83 to secure the adjusting screw 84 from unscrewing during operation Check the correctness of the lower fulcrum adjustment by closing the circuit breaker with the manual drive 36 and then by slowly withdrawing the insulating pusher assembly 86 When the circuit breaker contact gap is 1 5 2 5 mm the moving contact arm 6 should be supported at both the lower and upper fulcrum while closing the circuit breaker with the manual drive 36 and when the keeper 7 is pulled reduction of the pressing force of the moving contact arm 6 onto the insulating pusher assembly 86 is felt while slowly withdrawing the manual drive lever 36 When the contacts are closed the moving contact arm 6 should be supported in the lower fulcrum only 9 6 3 ADJUSTMENT THE INITIAL PLUNGER POSITION FIG 15 Open the circuit breaker Increase tension of the contact springs 33 until the moving contact 31 rests on the buffer 78 An initial plunger 48 position is set with the buffer 51 When the contacts are fully open set the buffer 51 with the shims 52 so that the L gap between the fork of the insulating pusher assembly 86 and the pin 85 is 2 3 mm After this gap is set tighten the screw fastening the buffer 51 Check this gap by pushing the pl
39. s recommended After contact replacement check if the circuit breaker settings are correct and follow the procedures described in points 9 2 9 3 and 9 4 if necessary 12 1 1 MOVING CONTACT REPLACEMENT Draw the arc chute aside and unscrew the two M10 screws with a socket wrench The longer screw is a special one of high strength and it fits the contact holes It must not be replaced with a screw of another type After contact replacement tighten the screws securely 12 1 2 FIKED CONTACT REPLACEMENT Unscrew the screw fastening the arcing horn or contact shield 27 remove the arcing horn or contact shield 27 unscrew the 2 screws fastening the fixed contact 28 Replace the fixed contact 28 and carry out the above procedure in reverse order 12 2 HOLDING COIL REPLACEMENT 12 2 1 CIRCUIT BREAKER BWS WITH HOLDING CURRENT STABILIZATION FIG 19 In order to replace the holding coil in the circuit breaker BWS with holding current stabilization proceed as follows unscrew the power leads of the coil from the stabilizer 13 unscrew the two M12 screws fastening the core yoke 89 disassemble the core yoke 89 replace the coil 16 install the core yoke 89 and screw it slightly with the two M12 screws 88 91 the core yoke should be able to move connect the power leads of the coil to the stabilizer 13 maintaining proper polarization switch on the holding coil 16 to draw the core yoke
40. ssing this results in breaking the fork of the insulating pusher assembly 86 by the pin 85 when opening the circuit breaker 9 7 3 ADJUSTMENT THE CONTACT CLOSING SPEED The speed at which the contacts are closed in the circuit breaker depends on the speed at which the piston 59 is withdrawn in the drive and the latter speed depends on the speed of pressure decrease in the drive cylinder 56 Use the screw 61 throttling the air flow out from the solenoid valve 60 to set the contact closing speed Air flowing out too fast from the solenoid valve can result in the keeper 7 being separated when the contacts touch each other however air flowing out too slowly can result in too slow contact closing and as a consequence of this an arc over before contact is obtained 9 8 SETTING THE CONTACT FORCE FIG 17 The operating contact force is 260 20 N The method of measurement is shown in fig 17 The force value is set with the nut 37 When the circuit breaker is closed attach thin wire or thin strong string below the lower contact edge The wire or string should be tangent to the axis of the pin 32 that bears the arc chute Pull back the moving contact with a dynamometer until the moving contact does not touch the fixed contact The moment when contact is lost can be recognized using an electric method e g with a lamp ohmmeter or mechanically while pulling out a slip of thin paper from between the contacts Secure the nut 37 w
41. t have its polarity set according to the indication on its terminal strip otherwise the discharge diode will be damaged The closing coil is not intend for continuous operation 6 2 CLOSING CIRCUIT BREAKERS WITH ELECTRO PNEUMATIC DRIVE After voltage is applied to the solenoid valve 60 compressed air causes piston 59 movement that is transferred with the insulating pusher assembly 86 through a pin 85 to the moving contact arm 6 The moving contact arm 6 pushes the keeper HI connected to it to the core 18 The moving contact 31 is then about 6 mm away from the fixed contact 28 when contacts are new and 10 mm away when contacts are worn After power supply to the solenoid valve is disconnected the moving contact turns around the axis 93 by the action of contact springs 33 and it lies down on the fixed contact 28 with a pressing force of 260 N The speed at which the contacts are closed depends on the speed of air flowing out of the cylinder 56 and the place of support of the contact by the withdrawing insulating pusher assembly In order to obtain adequate speed of air pressure decrease in the cylinder 56 a throttling screw 61 is used in the solenoid valve In general a circuit breaker with pneumatic drive is closed with a push button that applies a short voltage pulse directly to the solenoid valve coil 67 The solenoid valve coil is not polarized and similarly the coil of the electromagnetic drive is not intended for
42. t off and then a new pulse is applied All the control boards protect also against drive start up when the circuit breaker is closed The closing coil is intended for short operation therefore in each control board it is protected with a thermal relay or MCB The thermal relay is eguipped with a lock to prevent the drive from switching on again without previous unlocking Before unlocking check the reason for relay actuation It is also possible to switch off the locking function by blockage of the lock In such a case you can switch on the drive again after the relay bimetal is cooled Switch on the MCB after checking the reason of its actuation The BWTS B and BWTS N B boards have an additional protection of the holding system that operates in case of current consumption increase in the holding current stabilizer The protection will result in switching off the stabilizer and simultaneously switching the holding coil to a by pass supply circuit a resistor connected in series to the holding coil circuit Actuation of the protection does not result in opening of the working circuit breaker The holding coil can be switched over manually to the by pass supply circuit by switching the MCB GF The BWTS B and BWTS N B boards have auxiliary switch K3 terminals led to a signalling system to indicate operation of the protection system The signalling system should be used because holding coil operation in the by pass system is connected with no current sta
43. tic closing mechanism 34 H 74 25 74 72 71 s 76 752 I lt en 42 JI m pei SITA se __ n Li NSL Fig 10 BWS circuit breaker adjustment of auxiliary switches ad Fig 11 Contact gap adjustment in the open position of the circuit breaker O A KK 4 X turn the pull rod until 80 the slack is taken in Fig 12 Contact gap adjustment in transient condition N A 4 ELA press the manual drive lever home N NZ lt MIA S TE wii Oo N e LY a SSE Fig 13 Adjustment of the gap between the keeper and the holding core go e 5 e EI Si Im 1 EH using manual drive turn the screw until ME Fig 14 Lower fulcrum adjustment for the moving contact arm Fig 15 Adjustment the initial plunger position 40 Fig 16 Adjustment the initial piston position 41 28 01409 1083000 31 32 dynamometer Fig 17 Setting the contact force lifting slin Fig 18 Lifting of the BWS circuit breaker 42 90 89 88 BWS circuit breaker with holding current stabilizer N 00 O CA 92 90 a BWS circuit breaker without holding current stabilizer Fig 19 Keeper magnetic circuit 43 U1 U1 1121314 1516
44. unger 48 manually until contact between the fork of the insulating pusher assembly 86 and the pin 85 is felt and by measurement of the gap between the plunger 48 and the buffer 51 If the gap is too big there is a danger of the fork dropping out from the pin when the circuit breaker is closed however if the gap is missing this results in breaking the fork of the insulating pusher assembly 86 by the pin 85 when opening the circuit breaker 9 7 ELECTRO PNEUMATIC DRIVE ADJUSTMENT 9 7 1 LOWER FULCRUM ADJUSTMENT FOR THE MOVING CONTACT ARM This should be done as in the circuit breaker with the electromagnetic drive see point 9 6 2 SIT 9 7 2 ADJUSTMENT THE INITIAL PISTON 59 POSITION FIG 16 This is carried out when the circuit breaker is open The initial piston 59 position is set with a stop screw 58 When the contacts are fully open and the piston 59 rests on the stop screw 58 the L gap between the fork of the insulating pusher assembly 86 and the pin 85 should be 2 3 mm For this purpose tighten the stop screw 58 until the slack is taken in between the fork of the insulating pusher assembly 86 and the pin 85 and then unscrew it by 1 5 turn Secure this position with the lock nut 57 In addition check the gap visually while moving the manual drive lever 36 If the gap is too big there is a danger of the fork dropping out from the pin when the circuit breaker is closed however if the gap is mi
45. with a left hand thread close the circuit breaker e turn the insulator 75 until the normally open contact 72 has about 2mm overtravel on switches 2 6 or 2 7 73 and about 4 mm on switch no 1 76 If the values obtained are different suppress the differences by individual switch setting in oval holes used to their fastening The overtravel is identified as a slot between the contact bridge 72 and the base 71 of the normally open contact After setting tighten up the lock nuts 74 9 2 ADJUSTMENT THE KEEPER 7 ADHESION TO THE CORE 18 Before every circuit breaker adjustment clean the keeper 7 and core 18 surfaces and check their adhesion in the closed position of the circuit breaker The keeper 7 should adhere to the core 18 on the whole surface When checking use a source of light placed opposite to the observer If the light is visible between the keeper 7 and the core 18 adjustment is necessary Carry out the following actions with the circuit breaker in the closed position reduce tension of the springs 33 by loosening the nuts 37 loosen the screws do not unscrew them completely retaining both eccentrics 8 turn the eccentrics 8 until the light becomes invisible e tighten the screws retaining the eccentrics 8 increase tension of the springs 33 see point 9 8 After adjustment open the circuit breaker then close it and check the adhesion between the keeper 7 and the
46. year If no considerable signs of arc chute wear such as pearling sootiness at internal sides of the walls loosening of deionization plates loose or missing insulating plates are found then the arc chute operation can be continued If considerable signs of wear occur disassemble the arc chute evaluate its condition and if necessary regenerate it After each repeated switching off occurring as a result of several hard short circuits in short few seconds time intervals arc chute inspection is suggested and if necessary it should be disassembled to evaluate its wear condition Arc chute wear condition evaluation and regeneration Arc chute insulating middle plate right and left walls Clean the surfaces of the insulation middle plate and the right and left walls with a scraper to remove pearling copper tarnish and carbon black while using a vacuum cleaner to remove dust arising at the same time Deionization plates and insulating plates Immobilize loose deionization plates in right and left wall holes by fixing them again after previous projection upset or twist Deionization plates must not touch each other and should be seated perpendicular to the plane of the wall Secure loosened insulating plates in the deionization plates by crimping in a trident Complete missing insulating plates and replace the burnt insulating plates with new ones 225 Right horn internal horn and right horn Remove the remaining contact material from the

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