What is the "five-proof" function required for a high-voltage switchgear?

The so-called "five defenses" refers to preventing misoperation of the circuit breaker, preventing the switch from being pulled under load (to prevent pushing and pulling the trolley with load), preventing the ground wire from being charged (to prevent the ground switch from being charged), and preventing the ground wire (the ground switch is in the ground Position) to prevent power from entering the charging interval by mistake.