What happens if the power supply to the control circuit is disconnected while a 35KV high-voltage switchgear is in the closed position?
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What will happen if the power supply to the control circuit is disconnected while a 35KV high-voltage switchgear is in the closed position?
It will not trip, but it cannot be disconnected and loses its protection function!
Such a control power supply generally needs to be connected to an electrical source, right? I don’t know what will happen, OP – give it a try.:lol
High-voltage switchgear is generally pre-energized first, so a power outage at the time of operation cannot change the outcome
Power can only be cut off on-site; protection fails, and remote control does not work
Operation without protective devices is not allowed, as it also poses a risk to the upstream substation! Secondly, the circuit breaker cannot be operated remotely.
Protection does not work; remote operation is not possible
This will result in operation without protection, which is very dangerous for switchgear and transformers. The power supply company won’t allow it either.
There is no impact, but when a line fault requires it to trip, it fails to do so, which leads to bypass tripping. Additionally, when the protection device loses power under normal conditions, its monitoring and protection parameters and functions are unavailable