PD detection: a new approach

Electric discharges that not completely bridge the electrodes are named partial discharges. The apparent charge is the charge displacement in the leads of the specimen subsequent a PD event. In order to obtain a good evaluation of the discharge characteristics a high-sensitivity and high accuracy detector has been developed using a mixed analog and digital signal processing technique. Direct analog integration of current pulse is used to achieve apparent charge. Then an analog to digital conversion of signal is performed and the results are is: stored for subsequent mathematical treatments. The system is configured for the evaluation of all parameters listed in lEC270 standard. The system gives information typical of both “time resolved systems” and “phase resolved systems”