Rittal cabinet - judgment and treatment of energy storage faults in high-voltage switchgear

Create Date: 2024-8-30 12:03:23|Source: Rittal/Rittal

In the high-voltage cabinet with the spring energy storage operating mechanism, the energy storage must be stored in advance before closing. The energy storage mechanism is driven by an electric motor and the gear mechanism lengthens the spring. There are two types of operation methods: electric and manual. Manual failure to store energy should be due to a mechanical failure of the mechanism. Manual energy storage is possible, but electric energy storage is an electrical fault. The mechanism that has been in use for a short time has little mechanical wear and tear, and generally does not have mechanical failure.

1. Improper adjustment of the travel switch: The travel switch is a limit switch that controls the energy storage position of the motor. When the motor energy storage is in place, cut off the power supply of the motor. If the limit is too high, the institutional energy storage is full. The fault phenomenon is: the motor does not stop idling, and the energy storage indicator light does not light up. The motor can only be stopped by turning on the control switch (HK). When the limit adjustment is too low, the motor energy storage is not full and the motor is shut down in advance. Due to the energy storage is not in place, the switch cannot be closed. The way to adjust the limit is to manually and slowly store energy to find the correct position and tighten it.

2. Motor failure: If the motor winding is burned, there will be peculiar smell, smoke, fuse and other phenomena. If there is voltage at both ends of the motor, the motor does not rotate. It may be a fault such as the carbon brush falling off or being heavily worn. The way to determine whether it is a motor fault is to measure the voltage and resistance at both ends of the motor or replace it with another good motor for inspection.

3. Control switch failure or open circuit: When the control switch is damaged so that the circuit cannot be closed and the control loop is broken and the open circuit is caused, the fault is manifested in the form of the motor not rotating and there is no voltage at both ends of the motor. The way to find this is to measure the voltage or resistance with a multimeter. The measurement voltage method is that when the control circuit is energized, the multimeter is adjusted to the voltage level, and if there is a voltage (except for the step-down element), there is an open circuit point between the two points to be measured. Attention should be paid to the on-off of the bypass when using the measurement resistance method, and if there is a bypass parallel circuit, one end of the tested line should be disconnected.

Rittal cabinet - judgment and treatment of energy storage faults in high-voltage switchgear

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