GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 2)

2
PowerVac
®
Vacuum Circuit Breaker
With ML-18 or ML-18H 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 .......................................................................... 5
3.3 Storage............................................................................ 5
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 ................................................... 7
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 .................................................. 10
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-18 Wipe Spring Compression.................................... 11
8.3 ML-18H Wipe Spring Compression ................................. 11
8.4 Contact Gap .................................................................... 11
8.5 Coil Plunger Gap.............................................................. 11
8.6
Control Switch Adjustment.............................................. 12
8.6.1 LCS and SM/LS Switch Adjustment................................. 12
8.6.2 CL/MS Switch Adjustment .............................................. 12
8.6.3 IL/MS Switch Adjustment................................................ 13
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 Latch Stop Bolt...................................................... 24
16.7 Closing Spring Discharge Interlock .................................. 24
16.8 Negative Interlock ........................................................... 24
INDEX
........................................................................................ 37
Trouble Reporting Form................................................................ 39