Inspection and treatment of failure failure of high voltage circuit breaker

When the high-voltage circuit breaker is closed, it can be inspected from the electrical circuit and mechanical parts as well as the transmission mechanism.

1, electrical circuit failure

(1) Check if the actual capacity of the battery or silicon rectifier drops, causing the power supply voltage to be too low when the switch is closed, exceeding the minimum allowable value of the closing voltage;

(2) Check the fuses or other operating components of the closing circuit for any blown, poor contact and disconnection;

(3) Check whether the main contact or auxiliary contact of the closing DC contactor is malfunctioning, and whether the contactor electromagnetic coil is damaged or not;

(4) Check whether the closing coil itself is faulty (such as insulation damage between turns) and the electromagnetic attraction is insufficient;

(5) Check whether the components of the motor drive for closing are short-circuited, broken, and poorly connected;

(6) Check if the electromagnet ejector of the circuit breaker opening coil is stuck in the last position.

2. Operating mechanism failure

(1) Check if the overrun stroke adjustment of the closing iron core is sufficient;

(2) Check whether the closing iron core ejector pin is stuck;

(3) Check if the closing buffer gap is not adjusted enough to make the closing not in place;

(4) Check if the slope of the closing bracket is too steep, if there is insufficient contact between the bracket and the closing spindle, and the position of the bracket is not in the center of the bracket and the vibration is slipping;

(5) Check the three-point position of the branching board, and the phenomenon that the opening and closing plate moves upwards when there is no closing;

(6) Check whether there is any jam in the opening and return to the original position;

(7) Check if the return spring of the mechanism is invalid.

3, mechanical part failure

(1) Whether the positioning (or casing) of the transmission mechanism moves to generate a top or card phenomenon, so that the action is not in place;

(2) Whether the connecting shaft of the transmission mechanism is off.

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