Electrical five-proof, usually refers to the "five-proof" of high-voltage switchgear or the "five-proof one-way" of the power distribution room.
The five defenses of the high voltage switchgear are:
1. Prevent the separation and closing of the switch with load. (The circuit breaker, load switch, and contactor cannot be operated in the closed state.)
2. Prevent mis-sorting, mismatching circuit breakers, load switches, and contactors. (Only the operation command can correspond to the operation device to operate on the operated device)
3. Close the circuit breaker and load switch when the grounding switch is in the closed position. (Only when the grounding switch is in the open state, the disconnector or the handcart can be moved to the working position to operate the circuit breaker and the load switch is closed)
4. Prevent misalignment of the grounding switch when it is energized. (Only when the circuit breaker is opened, the disconnector or the handcart can be operated to retreat from the working position to the test position to close the grounding switch)
5. Prevent accidental entry into the live room. (The door can only be opened when the compartment is not energized)
The "five defenses" of the power distribution room are fireproof, waterproof, lightning-proof, snow-proof, and small animals. “One pass†is kept in good ventilation.
Electrical five defenses are:
1. Prevent the separation and closing of the switch with load.
2. Prevent mis-sorting, mismatching circuit breakers, load switches, and contactors.
3. Prevent the grounding wire (switch) from closing the circuit breaker (isolation switch).
4. Prevent live (closed) grounding wire (switch).
5. Prevent accidental entry into the charging interval.
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