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Instructions for VR-Series
Replacement Breakers for
Westinghouse Type B20B/B22B
IB01301018E
I.B. 94A1994R01
Page 2
Effective: April 2005
Table of Contents
SECTION 2: SAFE PRACTICES ............................................................................................................................. 7
SECTION 3: RECEIVING, HANDLING AND STORAGE ............................................................................................ 8
3.1 RECEIVING ........................................................................................................................................................................................................ 8
3.2 HANDLING ........................................................................................................................................................................................................ 8
3.3 STORAGE ........................................................................................................................................................................................................... 9
3.4 B20B / B22B-VR APPROXIMATE WEIGHTS ................................................................................................................................................... 9
4.1 EXAMINATION FOR DAMAGE ....................................................................................................................................................................... 12
4.1.1 NAMEPLATE VERIFICATION ...................................................................................................................................................................... 12
4.2 OPERATIONAL POSITIONS ........................................................................................................................................................................... 12
4.3 MANUAL OPERATIONAL CHECKS ............................................................................................................................................................... 12
4.4 VACUUM INTEGRITY CHECKS ..................................................................................................................................................................... 13
4.5 APPLIED POTENTIAL TEST (INSULATION CHECK) ................................................................................................................................... 13
4.6 CONTACT EROSION AND STROKE, CONTACT WIPE ................................................................................................................................. 13
4.7 PRIMARY CIRCUIT BREAKER RESISTANCE TESTS ................................................................................................................................... 13
4.8 CELL PREPARATION & ELECTRICAL OPERATIONAL CHECKS ................................................................................................................ 13
4.9 INSERTION PROCEDURE ................................................................................................................................................................................ 14
4.10 REMOVAL PROCEDURE .............................................................................................................................................................................. 15
SECTION 5: DESCRIPTION AND OPERATION .................................................................................................................................................... 16
5.1 VACUUM INTERRUPTER ................................................................................................................................................................................ 16
5.1.1 THE INTERRUPTER ASSEMBLY ................................................................................................................................................................. 16
5.1.2 CONTACT EROSION INDICATOR ............................................................................................................................................................... 16
5.1.3 CONTACT WIPE AND STROKE .................................................................................................................................................................. 17
5.2 PHASE BARRIERS .......................................................................................................................................................................................... 17
5.3 BUSHINGS AND DISCONNECTING CONTACT ASSEMBLIES ..................................................................................................................... 17
5.4 STORED ENERGY MECHANISM .................................................................................................................................................................... 17
5.4.1 CLOSING SPRING CHARGING ................................................................................................................................................................... 18
5.4.2 CLOSING OPERATION ................................................................................................................................................................................ 18
5.4.3 TRIPPING OPERATION ................................................................................................................................................................................ 18
5.4.4 TRIP-FREE OPERATION .............................................................................................................................................................................. 18
5.5 CONTROL SCHEMES ..................................................................................................................................................................................... 18
5.6 SECONDARY CONNECTION BLOCK ............................................................................................................................................................. 19
5.7 INTERLOCKS .................................................................................................................................................................................................. 19
5.7.1 ANTI-CLOSE INTERLOCK .......................................................................................................................................................................... 19
5.7.2 SHUTTER INTERLOCK ................................................................................................................................................................................ 19
5.7.3 RACKING SYSTEM CAM INTERLOCK ...................................................................................................................................................... 19
5.8 MOC (Mechanically Operated Contacts) OPERATOR ............................................................................................................................ 19
5.9 TOC (Truck Operated Contacts) OPERATOR .......................................................................................................................................... 24
5.10 STATIC GROUNDING CONTACT ................................................................................................................................................................. 24
6.1 INTRODUCTION .............................................................................................................................................................................................. 25
6.2 FREQUENCY OF INSPECTION ....................................................................................................................................................................... 25
6.3 INSPECTION AND MAINTENANCE PROCEDURES ....................................................................................................................................... 26
6.4 VACUUM INTERRUPTER INTEGRITY TEST .................................................................................................................................................. 27
6.5 CONTACT EROSION AND WIPE .................................................................................................................................................................... 27
6.6 INSULATION ................................................................................................................................................................................................... 28
6.7 INSULATION INTEGRITY CHECK .................................................................................................................................................................. 28
6.8 PRIMARY CIRCUIT RESISTANCE CHECK .................................................................................................................................................... 29
6.9 MECHANISM CHECK ..................................................................................................................................................................................... 29
6.9.1 CLOSURE