High-voltage switchgear energy storage failure judgment and treatment - Database & Sql Blog Articles

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In the high-voltage cabinet using the spring energy storage operating mechanism, the energy must be stored before the closing to close the switch. The energy storage mechanism is driven by a motor to drive the gear mechanism to lengthen the spring. There are two methods of operation: electric and manual. Failure to store energy manually should be a mechanical failure of the mechanism. Manual energy storage, but electric energy storage is an electrical fault. The mechanical wear of the mechanism that is used for a short period of time is generally small and there is generally no mechanical failure.

1. Incorrect adjustment of the stroke switch: The stroke switch is a limit switch that controls the energy storage position of the motor. The motor power is cut off when the motor is in storage. If the limit is too high, the energy storage of the mechanism is full. The fault phenomenon is: the motor does not stop during idle rotation, and the energy storage indicator does not light. The motor can only be stopped if the control switch (HK) is turned on. When the limit adjustment is too low, the motor energy storage is not full before the machine stops. Since the energy storage is not in place, the switch cannot be closed. The way to adjust the limit is to manually store the energy to find the correct position and tighten it.
2, motor failure: If the motor windings burn out, there will be odor, smoke, fuses and other phenomena. If there is voltage across the motor, the motor does not turn. It may be a malfunction such as a carbon brush falling off or a serious wear. The method of determining whether the motor is faulty is to measure the voltage across the motor, the resistance, or replace it with another good motor.
3. Control switch failure or open circuit: When the control switch is damaged, the circuit can not be closed and the control circuit is broken, causing the open circuit. The fault manifests that the motor does not rotate and there is no voltage at both ends of the motor. The search method is to measure the voltage or resistance with a multimeter. The measuring voltage method is that when the control circuit is energized, the multimeter is adjusted to the voltage level. If there is voltage (except the step-down element), there is an open point between the two points measured. The measurement resistance method should pay attention to the on/off of the bypass. If there is a bypass parallel circuit, the end of the line to be tested should be disconnected.