Capacitor troubleshooting

(1) When the capacitor explodes and catches fire, immediately disconnect the power supply and use sand and a dry fire extinguisher to extinguish the fire.

(2) When the fuse of the capacitor is blown, report to the dispatcher, and open the circuit breaker of the capacitor after obtaining the consent. Cut off the power supply to discharge it, and perform an external inspection first, such as whether there are flashover marks on the outside of the casing, whether the casing is deformed, whether there is oil leakage and whether there is a short circuit in the grounding device, etc., and measure the insulation resistance between the poles and the pole to the ground. Check whether the capacitor bank wiring is complete and firm, and whether there is phase loss. If no failure is found, you can change the insurance and put it on. If the fuse is still blown after the power is supplied, the faulty capacitor should be withdrawn, and the rest of the power supply should be restored. If the circuit breaker is tripped at the same time as the fuse is blown, it cannot be forced to send at this time.

(3) The circuit breaker of the capacitor is tripped and the shunt fuse is not broken. The capacitor should be discharged for three minutes before checking the circuit breaker current transformer power cable and the outside of the capacitor. If no abnormality is found, it may be caused by the voltage fluctuation of the external fault bus. After inspection, it can be tested; otherwise, a comprehensive power-on test of the protection should be carried out. Through the above inspections and tests, if the cause is still not found, it is necessary to act according to the system and gradually test the capacitors. No trial investment is allowed until the reason is ascertained.