Faults and troubleshooting methods for KYN movable high voltage switchgears
No. | Fault | Causes | Troubleshooting |
1 | CB cannot be closed | The CB trolley is not at the right position. | Make sure if the CB trolley is at test position or working position. |
The wiring for secondary control circuit is loosed. | Use screw drawer to connect the loosed connector. | ||
Closing voltage is low. | Check if the voltage at the two side of closing winding is low and regulate power supply voltage | ||
The block winding or closing winding is broken or burned. | Exchange block winding or closing winding; check voltage at the two side of closing winding is high or not and mechanical circuit is jammed or not. | ||
2 | CB cannot be opened | The wiring for secondary control circuit is loosed. | Use screw drawer to connect the loosed connector. |
Opening voltage is low. | Check if the voltage at the two side of opening winding is low and regulate power supply voltage | ||
Opening winding is broken or burned. | Check opening winding; check voltage at the two side of opening winding is high or not, regulate power supply voltage and mechanical circuit is jammed or not. Exchange opening winding | ||
3 | CB trolley cannot be rotated in when at test position | CB cannot move when at closing position due to interlock mechanism; when CB is at open status, CB trolley can move from test position to working position. | Make sure the CB is opened. |
CB trolley cannot be moved when grounding switch is closed due to interlock mechanism. | Make sure grounding switch is opened. | ||
If grounding switch is opened, but CB trolley cannot be rotated in, check if the operation tongue piece at the grounding switch operation hole is at the right position. | If operation tongue piece is not reset, regulate grounding switch operation mechanism. | ||
The working of CB shutters is abnormal. | Check door lifting mechanism is deformed, jammed or not and check if the working of CB chamber shutter is normal. | ||
4 | CB trolley cannot be rotated out when at working position | CB cannot move when at closing position due to interlock mechanism; when CB is at open status, CB trolley can move from working position to test position. If CB is opened, CB trolley still cannot be rotated out, the bottom plate is jammed normally. | Make sure CB is opened, then operate to check bottom plate mechanism. |
5 | Grounding switch cannot be operated | Operation tongue piece cannot be pressed down because cable side is electrified. ( interlock requirement) | Analyze the causes of electrifying. |
Block magnetic iron of grounding switch is not acted, operation tongue piece cannot be pressed down. | Check block power supply is normal , block magnetic iron is electrified. If the power supply is normal but the block magnetic iron is not electrified, change block magnetic iron. | ||
There is interlock between grounding switch and cable chamber due to FIVE PREVENTIONS; if the door of cable chamber is not closed, grounding switch cannot be closed. | Make sure the cable chamber door is closed. | ||
There is fault on driving mechanism. | Check the driving part |