What are the common reasons why high-voltage isolation switches refuse to separate?
When the isolating switch is operated manually or electrically, sometimes a refusal to open or close occurs. The possible reasons are as follows:
1. Operate organizational problems. The manual operating mechanism is frozen, rusted, stuck, the porcelain parts are cracked or cracked, the operating rod is cracked or the pin falls off, and the mechanical part is not connected after maintenance, causing the isolation switch to refuse to open or close. Failure of the isolation switch's own transmission mechanism will also cause the isolation switch to refuse to open or close.
2. Electrical circuit failure. Electrically operated isolation switch, the power circuit power fuse is blown, the motor is burned out or runs abnormally, the power supply is abnormal, the auxiliary contact of the operating circuit is in poor contact, the travel switch and control switch of the isolation switch are not switched properly, and the door control switch of the switch box is not turned on.
3. Misoperation or malfunction of anti-mistake equipment. A locking device is installed between the circuit breaker and the isolating switch to prevent misuse. When the operation sequence is wrong, the isolation switch will refuse to open or close due to the blocking isolation switch. When the error prevention device fails, the isolation switch will also refuse to move.
4. The isolating switch is welded or the contact is deformed, causing the blade to conflict with the knife tip and causing the isolating switch to refuse to move.
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How to deal with the isolation switch refusing to separate or close:
When the operating mechanism fails, such as freezing or gas or other reasons, do not use strong impact to operate. The support pin and operating rod should be inspected to find out the reasons for increased resistance, such as rust, mechanical jamming, component damage, main contact obstruction or welding, which should be repaired and repaired.
If there is an electrical circuit fault, the cause of the fault should be identified and dealt with accordingly. It is confirmed that it is not a misoperation but a malfunction of the anti-accidental locking circuit. The cause should be identified and the malfunction of the anti-accidental equipment should be eliminated. Or according to the conditions required for locking, strictly check the position status of the corresponding circuit breaker and isolation switch. After verification, avoid the locking of the accident prevention equipment before operating.
When the high-voltage isolation switch refuses to open or close, the contactor action, motor torque, transmission mechanism action, etc. should be observed to determine the scope of the fault.
