I.B. 3A74499B
Page iv
Effective 11/97
TABLE OF CONTENTS
PAGE
SECTION 1
INTRODUCTION
1-1
Type W-VAC Breaker Ratings.............................................................................................................................1
SECTION 2 SAFE PRACTICES ................................................................................................................................4
SECTION 3
RECEIVING, HANDLING AND STORAGE
3-1 Receiving.............................................................................................................................................................5
3-2
Handling ..............................................................................................................................................................6
3-3
Storage ...............................................................................................................................................................6
SECTION 4
INSTALLATION
4-1
Initial Inspection and Operation.........................................................................................................................12
4-2
Manual Operation Check...................................................................................................................................12
4-3
Vacuum Interrupter Integrity..............................................................................................................................12
4-4 Insulation ...........................................................................................................................................................12
4-5
Contact Erosion and Wipe.................................................................................................................................12
4-6
Primary Circuit Resistance ................................................................................................................................12
4-7
Nameplate .........................................................................................................................................................12
4-8
Electrical Operations Check ..............................................................................................................................12
4-9
Breaker/Compartment Interface Check.............................................................................................................13
SECTION 5
DESCRIPTION AND OPERATION
5-1
Interrupter Assembly .........................................................................................................................................16
5-1.1 Vacuum Interrupter............................................................................................................................................16
5-1.2 Contact Erosion Indicator ..................................................................................................................................17
5-1.3 “T” Cutout Loading Spring Indicator ..................................................................................................................17
5-1.4 Contact Wipe and Stroke ..................................................................................................................................17
5-1.5 Pole Unit Support Molding.................................................................................................................................18
5-2
Stored Energy Mechanism ................................................................................................................................18
5-2.1 Operation of Stored Energy Mechanism ...........................................................................................................18
5-2.2 Charging............................................................................................................................................................19
5-2.3 Closing Operation..............................................................................................................................................19
5-2.4 Tripping Operation.............................................................................................................................................19
5-2.5 Trip Free Operation ...........................................................................................................................................19
5-3
Control Scheme.................................................................................................................................................19
5-3.1 Timing .............................................................................................................................................................22
5-3.2 Secondary Disconnects.....................................................................................................................................22
5-3.3 Undervoltage Trip Device..................................................................................................................................22
5-4
Interlocks ...........................................................................................................................................................23
5-4.1 Floor Tripping, Spring Release and Anti-Latch Interlocks .................................................................................23
5-4.2 Levering Interlock ..............................................................................................................................................23
5-4.3 Anti-Close Interlock ...........................................................................................................................................23
5-4.4 Earthing Drive Interlock .....................................................................................................................................23
Summary of Contents for 36W-VAC25
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