S&C Mark V Instruction Sheet

S&C Instruction Sheet 711-590 9
Inspection Recommendations
Recommended Inspection Procedures
The Mark V Circuit-Switcher inspection procedures to be
followed are summarized in Table 2. The applicable S&C
instruction sheets for the circuit-switcher, switch operator,
pre-insertion inductor, grounding switch, etc., should be
referenced for further details.
Table 2� Recommended Inspection Procedures for S&C Mark V Circuit-Switcher Components
Component Inspection Procedures
General
1� Check with the nearest S&C Sales Office to determine whether there are any outstanding field notifications involving inspection,
maintenance, or retrofit�
2� Check the overall cleanliness of the insulators, live parts, and exterior of the operator� If there is severe contamination, power wash
with water or clean using a non-abrasive cleaning method� After washing, reapply an appropriate contact lubricant,to the disconnect
live parts�①
Switch operator
1� Check for evidence of water ingress, damage, excessive corrosion, or wear�
2� Check the ease of operation during slow, manual cranking using the switch operator manual operating handle� Listen for
simultaneity of tripping of the interrupters� From the point at which one interrupter trips, no more than 40° of rotation should be
required before the other two interrupters trip� If excessive rotation is required, contact the nearest S&C Sales Office�
3� Simulate a fault by activating the protective relay circuit (if applicable)� Check electrical operation, coupled and decoupled�
4� Check for loose wiring inside the enclosure and proper functioning of the position-indicating lamps, operation counter, convenience
lamp, etc�
5� Check brake operation and adjust, if necessary�
6� Check the key interlocks, if furnished, mechanically and electrically�
Power train
1� Check for evidence of damage, excessive corrosion, or wear�
2� Check the fastener tightness�
3� Observe operation during slow, manual cranking using the switch operator manual operating handle� Check for complete stroking
of the various drive levers against their stops and for attainment of over toggle positions, as required�
4� Check seal conditions�
Brain
1� Remove the brain cover and check for evidence of water ingress, damage, excessive corrosion, or wear�
2� Check for tightness of shunt-cable fasteners and for evidence of excessive fraying of the shunt cable�
3� Check the seal conditions�
4� Replace the brain cover� Observe operation during slow, manual cranking using the switch operator manual operating handle�
Listen for the tripping action of the interrupter on opening and observe operation of the interrupter targets�
5� Check for proper clearances at the brain adjustment-holding device and at the blade crank-arm stop�
Shunt-trip device
1� Remove the shunt-trip solenoid-housing cover and check for evidence of water ingress, damage, excessive corrosion, or wear�
2� Check the seal conditions�
3� Replace the shunt-trip solenoid-housing cover� Simulate a fault by activating the protective-relay circuit� Verify all three shunt-trip
solenoids function and the switch operator motor follows through to open the disconnect�
Interrupter
1� Check for low gas pressure (red indicator)�
2� Check the fastener tightness on current-carrying parts�
3� (Optional) Check the resistance using the resistance values in Table 3 on page 11 for a vertical-break or integer style circuit-switcher
or Table 4 on page12 for a center-break style circuit-switcher�

S&C Mark V Specifications

General

Brand	S&C
Model	Mark V
Category	Switch
Language	English