Abnormal operation and accident handling of 500kV isolation knife gate and grounding knife gate - News - Global IC Trade Starts Here.

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1. After the electric switch and the switch of the disconnector fail, check whether the double number of the equipment is correct, check whether the operation steps are correct, and then check whether the power supply circuit of the power supply circuit is in good fuse or not, whether the electrical lock circuit is normal or not. The situation should be processed immediately:
1. The rod porcelain column is severely damaged and discharged (including the base);
2. The rod-shaped porcelain column explodes due to thermal discharge;
3. The contact is overheated and welded;
4. The transmission mechanism is faulty and is in an abnormal state.
2. When the knife gate is different (500kV knife gate exception) or when it is not straight, it should be opened again (remote or local), if it is true that the three phases cannot be closed at the same time or when it is not straight, The 220kV can be adjusted by the insulating rod or adjust the linkage rod. If it is impossible to adjust, it should be powered off for maintenance.
3. When it is found that the knife gate or the busbar contact part is overheated, it should immediately apply for dispatching to reduce the load and then use the reverse busbar or other equipment to supply the load according to the situation; strengthen the monitoring measures and, if necessary, immediately stop the power supply.
4. Handling of the malfunction of the knife gate:
1. Check if the double number of the knife gate is correct and check whether the operating procedure is correct;
2. The preliminary judgment is whether the electrical or mechanical problem causes the failure of the knife gate. The electrical problem should be handled according to the following procedures. When the mechanical problem cannot be repaired, the relevant leader is reported;
3. Check if the power supply of the local knife gate mechanism is put in, and whether the thermocouple relay is tripped;
4. Check if the small switch of the side door lock of the local knife gate mechanism is good;
5. Check if the local knife switch mechanism travel switch is in place;
6. Use a multimeter to measure the contact on the loop step by step;
7. Identify the problem and unlock the unlocked operation that cannot be processed.
3.5. "Isolation switch control power disappears" light plate, the power supply of the reaction isolation switch repetitive relay circuit disappears, the loop power of #2 main transformer is taken from the interface screen 9RD, 10RD of #2 main transformer, the loop control# 2 main change side short lead protection for the retreat. Therefore, the power supply must be restored immediately after the circuit is de-energized, and the short-lead protection must be treated as necessary. The 500kV II string 5021, 5022, 5023 circuit breaker, Jiangmao line reactor, Jiangmao line 500kVI, II mother-knife isolation switch The loop power is taken from the respective air small switches of the 500kV second string interface screen. The power supply of the 500kV III-separated isolating switch control loop is taken from the III-series breaker interface screen. The power supply of the IV-separated isolating switch control loop is taken from the IV string breaker interface screen.