Cover SGIM-9918-01
Table of Contents
Vacuum Circuit Breaker Operator Module
1
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
Release and Undervoltage Release
(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
Automatic Spring Charging Check
(Control Power Required)....................................................18
Electrical Close and Trip Check
(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
