Troubleshooting of Capacitors

(1) When the capacitor explodes and catches fire, immediately disconnect the power supply and put out the fire with sand and dry fire extinguisher.
(2) When the fuse of the capacitor is blown, it should be reported to the dispatcher, and the circuit breaker of the capacitor should be opened after obtaining the approval. Cut off the power supply to discharge it, and conduct external inspection first, such as whether there are flashover marks on the outside of the bushing, whether the casing is deformed, whether there is oil leakage and whether there is a short circuit in the grounding device, etc., and shake the insulation resistance between the poles and the pole to the ground. value, check whether the wiring of the capacitor bank is complete and firm, and whether there is a phase loss phenomenon. If the fuse is still blown after power transmission, the faulty capacitor should be withdrawn, and power transmission to the rest should be resumed. If the circuit breaker also trips when the fuse is blown, do not force it. After the above inspections are completed, the insurance will be replaced before investing.

(3) The circuit breaker of the capacitor trips, but 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 external fault bus voltage fluctuation. After inspection, it can be tested; otherwise, a comprehensive power-on test for protection should be further carried out. Through the above inspections and tests, if the reason is still not found, it is necessary to act according to the system and gradually test the capacitor. Do not try to vote until the reason is identified.