I.B. 32-255-1G
Page iv
Effective 12/02
TABLE OF CONTENTS
PAGE
SECTION 1
INTRODUCTION
1-1
Preliminary Comments and Safety Precautions..................................................................................................1
1-1.1
Warranty and Liability Information ..........................................................................................................1
1-1.2 Safety Precautions .................................................................................................................................1
1-2
General Information.............................................................................................................................................1
1-3
Type VCP-W Vacuum Circuit Breaker Element Ratings (Tables 1.1, 1.2, 1.3 and 1.4) ......................................3
1-4
Outlines and Dimensions ....................................................................................................................................5
SECTION 2
SAFE PRACTICES
2-1
Recommendations ..............................................................................................................................................7
SECTION 3
RECEIVING, HANDLING AND STORAGE
3-1
General ...............................................................................................................................................................8
3-2
Receiving.............................................................................................................................................................8
3-3
Handling ..............................................................................................................................................................8
3-4
Storage ...............................................................................................................................................................8
3-5
Tools and Accessories ........................................................................................................................................9
3-6
Type VCP-W Vacuum Circuit Breaker Element Weights (Tables 3.1 and 3.2) ...................................................9
SECTION 4
INITIAL INSPECTION AND INSTALLATION
4-1
Introduction........................................................................................................................................................16
4-2
Manual Operation Check...................................................................................................................................16
4-3
Vacuum Interrupter Integrity..............................................................................................................................16
4-4
Insulation ...........................................................................................................................................................16
4-5
Contact Erosion and Wipe.................................................................................................................................16
4-6
Primary Circuit Resistance ................................................................................................................................16
4-7
Nameplate .........................................................................................................................................................16
4-8
Electrical Operation Check................................................................................................................................17
4-8.1
Circuit Breaker Insertion and Removal.................................................................................................17
4-8.2
Operation Check Performance .............................................................................................................19
4-9
Circuit Breaker/Structure Interfacing .................................................................................................................20
4-9.1
Interface Interlocks/Interfacing Check ..................................................................................................20
SECTION 5
DESCRIPTION AND OPERATION
5-1
Introduction........................................................................................................................................................22
5-2
Interrupter Assembly .........................................................................................................................................22
5-2.1
Vacuum Interrupter...............................................................................................................................22
5-2.2
Contact Erosion Indication ...................................................................................................................23
5-2.3
“T” Cutout Loading Spring Indicator .....................................................................................................23
5-2.4
Contact Wipe and Stroke .....................................................................................................................23
5-2.5
Phase Barriers......................................................................................................................................23
Summary of Contents for 50VCPW-ND250
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