GE PowerVac User Manual

2
PowerVac
®
Vacuum Circuit Breaker
with ML-20 Mechanism
Table of Contents
Description Page
SECTION 1−
−−
−Introduction
............................................ 4
1.1 Safety.............................................................................. 4
1.2 Maintenance ................................................................... 4
SECTION 2−
−−
−Description
............................................... 5
2.1 General............................................................................ 5
2.2 Summary Description...................................................... 5
SECTION 3−
−−
−Receiving, Handling and
Storage
...................................................... 5
3.1 Receiving ........................................................................ 5
A. Equipment Packages................................................. 5
B. Inspecting for Damage .............................................. 5
C. Filing a Claim............................................................. 5
3.2 Handling.......................................................................... 6
3.3 Storage............................................................................ 6
SECTION 4−
−−
−Features
...................................................... 6
4.1 Safety Precautions........................................................... 6
4.2 Interlocks......................................................................... 6
4.2.1 Rating Interference Plate................................................. 6
4.2.2 Closing Spring Interlock................................................... 6
4.2.3 Negative Interlock............................................................ 7
4.2.4 Positive Interlock Bar....................................................... 7
4.2.5 Closing Spring Gag Interlock............................................ 7
SECTION 5−
−−
−Operation
.................................................. 8
5.1 General............................................................................ 8
5.2 Close Spring Charging..................................................... 8
5.3 Closing Operation............................................................ 8
5.4 Opening Operation.......................................................... 9
5.5 Trip-free Operation.......................................................... 9
SECTION 6−
−−
−Control Circuit
....................................... 9
SECTION 7−
−−
−Mechanical Checking and
Slow Closing
......................................... 9
7.1 Visual Inspection.............................................................. 9
7.2 Closing Spring Charging .................................................. 9
7.3 Closing Spring Gag..........................................................10
7.4 Slow Closing....................................................................10
7.5 Gag Plate Removal..........................................................10
SECTION 8−
−−
−Dimensional Checks
.........................11
8.1 Primary Contact Erosion ..................................................11
8.2 ML Wipe Spring Compression ........................................11
8.3 Contact Gap ....................................................................11
8.4 Close Coil Plunger Gap....................................................12
8.5 Trip Coil Plunger Gap.......................................................12
8.6 Control Switch Adjustment..............................................12
Description Page
SECTION 9−
−−
−Electrical Checks
.................................14
9.1 Electrical Operation.........................................................14
9.2 High Potential Test..........................................................14
9.2.1 Primary Circuit................................................................. 14
9.2.2 Secondary Circuit ............................................................14
9.3 Primary Circuit Resistance ..............................................14
9.4 Vacuum Interrupter Integrity Test.................................... 14
9.5 Insulation Test.................................................................15
SECTION 10−
−−
−Checking and Installing
Breakers
.................................................16
SECTION 11−
−−
−Maintenance
.......................................17
11.1 General ...........................................................................17
11.1.1 PowerVac Interrupter......................................................17
11.1.2 Trouble Reporting........................................................... 17
11.2 Service Conditions ..........................................................17
11.3 Fault Interruptions...........................................................17
11.4 Contact Erosion............................................................... 17
11.5 Transfer Finger Wear......................................................17
11.6 Mechanism.....................................................................17
11.7 Primary Insulation Parts...................................................17
11.8 Lubrication ......................................................................18
11.9 Recommended Maintenance..........................................18
SECTION 12−
−−
−Timing
......................................................19
SECTION 13−
−−
−Opening and Closing Speed
..20
SECTION 14−
−−
−Repair and Replacement
...........21
14.1 General ...........................................................................21
14.2 Replacement of Interrupter Assemblies .........................21
14.3 Primary Disconnect Fingers ............................................21
14.4 Mechanism.....................................................................21
14.5 Control Switches.............................................................21
14.6 Trip Coil Replacement.....................................................21
14.7 Closing Coil Replacement...............................................22
14.8 Auxiliary Switch Replacement......................................... 22
14.9 Motor Replacement........................................................22
14.10 “Y” Relay Replacement...................................................22
SECTION 15−
−−
−Renewal Parts
....................................23
15.1 Ordering Instructions....................................................... 23
SECTION 16−
−−
−Mechanical Adjustment
............23
16.1 General ...........................................................................23
16.2 Wipe Adjustment............................................................ 23
16.3 Contact Gap Adjustment.................................................23
16.4 Trip Coil Plunger..............................................................24
16.5 Close Coil Plunger........................................................... 24
16.6 Close Spring Discharge Interlock.....................................24
16.7 Negative Interlock...........................................................24
INDEX
........................................................................................36
Trouble Reporting Form................................................................37

GE PowerVac Specifications

General

Brand	GE
Model	PowerVac
Category	Circuit breakers
Language	English