On-line monitoring instrument of fault discharge in large generators

This paper describes a newly developed partial discharge (PD) on-line monitoring system used for large turbine generators. The system consists of a broadband current transducer, a computer-aided PD measurement system. By using a programmable fabricated band pass filter and an adaptive digital filter, the system can suppress the noise and extract PD signal from the intense noise surroundings successfully. At the end of this paper, some field test results, obtained from a 200 MW generating set, are presented and discussed