Safety Considerations When Handling Failed Capacitors

Since the two poles of the capacitor have the characteristics of remaining residual charge, first try to discharge the charge, otherwise electric shock accidents may occur. When dealing with faulty capacitors, the circuit breaker of the capacitor bank and its upper and lower isolation switches should be opened first. If a fuse is used for protection, the fuse tube should be removed first. At this time, although the capacitor bank has been self-discharged through the discharge resistor, there will still be some residual charge, so manual discharge must be performed. When discharging, firstly fix the grounding end of the grounding wire and the grounding grid, and then discharge the capacitor with the grounding rod several times until there is no spark and discharge sound, and finally fix the grounding wire. At the same time, it should also be noted that if the capacitor has internal disconnection, blown fuse or poor lead contact, there may be residual charges between its two poles, and these residual charges will not be discharged during automatic discharge or manual discharge. of. Therefore, operation or maintenance personnel should wear insulating gloves before touching the faulty capacitor, and short-circuit the two poles of the faulty capacitor with a short-circuit wire to discharge it. In addition, the capacitors connected in series should be discharged separately.