Title :
A practical PD online monitoring system used for transformers
Author :
Jian, Li ; Du Lin ; Caixin, Sun ; Ruijin, Liao ; Weigen, Chen
Author_Institution :
Key Lab. of High Voltage Eng. & Electr. New Technol., Chongqing Univ., China
Abstract :
In this paper, we develop a partial discharge (PD) online monitoring system with frequency band from 50 kHz to 1 megahertz used for transformers. The monitoring system mainly consists of wide-band signal detectors for multi-terminal measurements, signal pre-processing circuit, high speed A/D converter and cascaded 2nd order IIR lattice digital notch filter. The major measures to suppress narrowband interference are the signal pre-processing device and the digital notch filter. With analysis to field monitored signal from a transformer at a 220 kV substation, it is shown that the monitoring system can detect and extract the discharge pulse signal effectively. With PD pattern recognition method, the monitoring system can get more stable and reliable detection results
Keywords :
IIR filters; analogue-digital conversion; computerised monitoring; insulation testing; lattice filters; notch filters; partial discharge measurement; power transformer insulation; power transformer testing; signal processing; 220 kV; 50 kHz to 1 MHz; PD online monitoring system; cascaded 2nd order IIR lattice digital notch filter; discharge pulse signal extraction; high speed A/D converter; multi-terminal measurements; narrow-band interference suppression; partial discharge online monitoring system; signal pre-processing circuit; transformer; wide-band signal detectors; Detectors; Digital filters; Frequency; IIR filters; Monitoring; Partial discharge measurement; Partial discharges; Signal detection; Transformers; Wideband;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973795
