GE SecoGear User Manual

Also see for SecoGear: Application guide Installation, operation and maintenance manual

SecoGear 24kV-27kV Air Insulation Switchgear25Major Repairs and examplesBe sure to comply with the applicable safetyregulations when carrying out repairs.Verify the switchgear is de-energized and the safetymeasures are in place.Pay attention to the direction of the tapered washersand the bolted connection torque should reach 86 N-m.• Open the main busbar compartment and check the tighteningtorques for the busbar bolted connections• Check the main busbar and branch busbar for any dampnessor rust.• Check all the sidewalls for any dampness or rust.• Check the main busbar compartment for any unexpectedobject.• Restore the insulation shield and the pressure flap on the topof the panel.• Check the fitness of the fixed contact and the surfacecondition.• Open the cable compartment and check the cable connectionas wells as the connectors for color distortion.• Check the sealing condition of through holes for the primaryand secondary cables.• Check the heater condition.• Check the breaker and cable compartment for unexpectedobjects.• Check the secondary connections of the CTs.• Check the current terminals in the low voltage compartmentfor the close loop of the secondary current circuit. Checkthe protection relay, ammeter, energy meter, etc. on the CTsecondary are in service.Inspection and replacement of themain busbarUnexpected objects in the busbar compartment, or a loosebolted connection, may result heated joint or even phase fault.The procedure to change the main busbar is as follow;• Remove the rear covers on the busbar compartment, as wellas the same on the adjacent panels. Now the busbar is visible.(see figure 6/1)Figure 6/1: Busbar after opening the rear cover• Remove the pressure flap on the busbar compartment• Remove the busbar insulation shield• Remove the connection bolt on the main bar and branchbusbar• Remove the busbar from the busbar compartment• Install the new main busbar and fasten the joints• Cover the busbar joints with insulation shield• Reassemble the pressure flaps and rear cover panels for thebusbar compartment