Safety Operation Requirements Of High Voltage Disconnect Switches

Operation high voltage isolator must strictly adhere to electrical safety regulations. Before tripping, the load current of the line must be completely disconnected by the circuit breaker, and high voltage isolator switch can only be activated after the current has dropped to near zero. This is because hv isolator lacks arc-extinguishing capability; if forced to trip while energized, a continuous arc will be generated between the contacts, causing equipment burnout or even a phase-to-phase short circuit.

Regularly monitoring the movement trajectory of the switch during tripping is equally important. If the switch of hv isolator switch is found to be abnormally slow in its descent or stuck, operation of high voltage electrical isolator should be stopped immediately and a mechanical inspection performed. Possible causes include shaft corrosion, loose operating lever connections, or limit device misalignment. Monitoring contact temperature rise through infrared thermography and measuring contact resistance allows for timely intervention before the fault escalates.

In switching operations of power distribution systems, the combined use of the gravity-assisted tripping type isolator high voltage device and the circuit breaker creates reliable physical isolation conditions for line maintenance. Its stable breaking capacity and simplified maintenance process have led to the widespread deployment of this type of equipment in substations and transmission lines.