If the current of the circuit breaker is greater than that of the disconnector, it is possible that the disconnector will be blown out because it exceeds the maximum current before the circuit breaker reaches its maximum withstand current, and then the arc will generate overvoltage, which will endanger other equipment.

Main functions of disconnector

(1) After the brake is disconnected, a reliable insulation gap shall be established to separate the equipment or line to be overhauled from the power supply, and there shall be an obvious disconnection point to ensure the safety of the maintenance personnel and equipment.

(2) according to the operation needs, replace the line.

(3) It can be used for dividing and combining small currents in lines, such as the charging current of bushings, buses, connectors and short cables, the capacitive current of switching voltage equalizing capacitors, the circulating current when switching double buses, and the excitation current of voltage transformers.

(4) According to the specific conditions of different structural types, it can be used to divide and combine the no-load excitation current of a transformer with a certain capacity.

Main characteristics of circuit breaker

The characteristics of circuit breakers mainly include: rated voltage UE; Rated current in; Setting range of tripping current for overload protection (Ir or Irth) and short circuit protection (Im); Rated short-circuit breaking current (industrial circuit breaker Icu；; Household circuit breaker Icn), etc.

Circuit breaker _ Baidu Encyclopedia

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Detached _ Baidu Encyclopedia

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