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Precautions when using high voltage capacitors

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1. Under normal circumstances, when the power station is out of power, the circuit breaker of the high voltage capacitor branch should be opened first, and then the circuit breakers of other branches should be opened; the operation sequence and power failure when the power transmission of the whole substation is restored In contrast, the circuit breakers of each branch should be closed first, and the circuit breaker of the high voltage capacitor bank should be closed. In the event of an accident, the branch circuit breaker of the high voltage capacitor bank must be disconnected first after the station has no power.

2. The parallel capacitor bank breaker is not allowed to transmit power after tripping. After the melt is blown, the power can not be restored after the melt is replaced before the cause is ascertained.

3. The high voltage capacitor is forbidden to close when it is charged. If the capacitor itself has a stored charge, when it is connected to an AC circuit, the voltage across the capacitor will exceed its rated voltage. If the capacitor is just powered off and on, because the capacitor itself has stored charge, the capacitor can withstand more than twice the rated voltage peak, which is not only harmful to the capacitor, but also more likely to blow the fuse or trip the circuit breaker. In case of overvoltage. The high voltage capacitor bank is closed again and should be carried out after 3 minutes of power failure.

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