On-line monitoring of partial discharges in power capacitors using high frequency current transformer technique

摘要

A novel technique has been designed and developed for online monitoring of partial discharges in power capacitors by employing high-frequency current transformers. Experimental investigations have been carried out in the laboratory on simulated capacitor banks in order to study the possibility of locating a defective unit in the bank. To check the feasibility and the suitability of the technique under operating conditions of the capacitors, field trails have been carried out on 3.3 and 11 kV capacitor banks maintained by some industries and electricity boards. The technique has been found to be effective in locating a defective unit in a capacitor bank.