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Vacuum Circuit Breaker Operator Module
Table of Contents
Introduction and Safety ........................................................ 3
Introduction .............................................................................. 3
Qualified Person ....................................................................... 3
Signal Words ............................................................................ 3
Dangerous Procedures ................................................. 3
Field Service Operation ............................................................ 3
Receiving, Handling and Storage ......................................... 4
Introduction .............................................................................. 4
Receiving Procedure ................................................................ 4
Shipping Damage Claims (when applicable) ............................ 4
Handling Procedure .................................................................. 4
Storage Procedure ................................................................... 4
Installation Checks and Initial Functional Tests .................. 5
Introduction .............................................................................. 5
Inspections, Checks and Tests without Control Power ........... 5
Manual Spring Charging Check ................................................ 5
Automatic Spring Charging Check ........................................... 5
Final Mechanical Inspections without Control Power .............. 5
Interrupter/Operator Description ......................................... 6
Introduction .............................................................................. 6
Vacuum Interrupters ................................................................ 7
Primary Disconnects (Figure 4) ................................................ 7
Phase Barriers .......................................................................... 7
Stored Energy Operating Mechanism ...................................... 7
Interrupter/Operator Module .................................................... 7
Construction (Refer to Figures 1, 2 and 5) ............................... 8
Breaker Pole (Figure 5) ............................................................. 8
Current-Path Assembly (Figure 5) ............................................ 8
Vacuum Interrupter (Figure 5) .................................................. 8
Switching Operation (Figure 6) ................................................ 8
Operating Mechanism ............................................................. 8
Construction .......................................................................... 10
Indirect Releases (Tripping Coils) (Figure 6) ........................... 10
Motor Operating Mechanism (Figure 6) ................................. 10
Auxiliary Switch (Figure 6) ...................................................... 10
Mode of Operation ................................................................. 10
Charging ................................................................................. 10
Closing (See Figure 6) ............................................................ 10
Trip Free Operation (Figure 6) ................................................ 10
Opening (Figure 6) ................................................................. 10
Rapid Auto-Reclosing ............................................................. 12
Manual Operation .................................................................. 12
Manually Charging the Closing Spring (Figure 6) ................... 12
Manual Closing (Figure 6) ...................................................... 12
Manual Opening (Figure 6) ..................................................... 12
Indirect Releases (Dual Trip or Undervoltage) ........................ 12
Secondary (Shunt) Release .................................................... 12
Undervoltage Release ............................................................ 13
Construction and Mode of Operation of Secondary .............. 13
(See Figures 9, 10 and 11) .................................................. 13
Capacitor Trip Device ............................................................. 13
Shock Absorber ...................................................................... 14
Auxiliary Switch ...................................................................... 14
Maintenance ......................................................................... 15
Introduction and Maintenance Intervals ................................. 15
Recommended Hand Tools .................................................... 15
Recommended Maintenance and Lubrication ....................... 15
Checks of the Primary Power Path ........................................ 16
Cleanliness Check .................................................................. 16
Checks of the Stored Energy Operator Mechanism .............. 16
Maintenance and Lubrication ................................................. 16
Fastener Check ...................................................................... 17
Manual Spring Charging and Contact Erosion Checks ........... 17
Electrical Control Checks ....................................................... 18
Check of the Wiring and Terminals ........................................ 18
(Control Power Required) .................................................... 18
(Control Power Required) .................................................... 20
Checks of the Spring Charging Motor .................................... 20
Vacuum Interrupters .............................................................. 20
Interrupter Vacuum Check Mechanical (Figures 16) .............. 20
High-Potential Tests ............................................................... 20
Vacuum Integrity Check (using Dielectric Test) ...................... 20
High Potential Test Voltages .................................................. 20
Vacuum Integrity Test Procedure ........................................... 21
As-Found Insulation and Contact Resistance Tests ............... 21
Insulation and Contact Resistance Test Equipment ............... 21
Insulation and Contact Resistance Test Procedure ................ 22
Inspection and Cleaning of Breaker Insulation ....................... 22
Functional Tests ..................................................................... 22
Overhaul ............................................................................... 23
Introduction ............................................................................ 23
Circuit Breaker Overhaul ........................................................ 23
Replacement at Overhaul ...................................................... 23
Replacement of Vacuum Interrupters .................................... 23
Hydraulic Shock Absorber ...................................................... 25
Maintenance and Troubleshooting .................................... 27
Appendix ............................................................................... 30
Cover SGIM-9918-01
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