Title :
Detection of partial discharges at field in SF6 insulated equipments
Author :
Bacega, Wilson R. ; Tatizawa, Hédio ; Bacega, Felippe
Author_Institution :
ISACTEEP, Sao Paulo, Brazil
Abstract :
This paper presents the results of research aiming to develop partial discharge detection techniques in high voltage equipment, at substation environment. Measurements of high frequency components of leakage current, at equipments´ grounding conductor, were performed. This procedure was performed with the equipment energized and without disconnecting it from the system. The partial discharge generated current pulse is picked up by a high frequency CT, and is detected by an oscilloscope. The partial discharge identification was made considering previously obtained laboratory results, where partial discharges were characterized by means of its time domain signatures. This paper focuses measurements in SF6 circuit breakers. Encouraging results were obtained, showing the feasibility of detecting partial discharges in energized equipment in the laboratory and in the field, in a substation environment, using this method.
Keywords :
SF6 insulation; circuit breakers; conductors (electric); current transformers; leakage currents; partial discharge measurement; substation insulation; time-domain analysis; SF6 circuit breakers; SF6 insulated equipments; current pulse; equipment grounding conductor; high frequency CT; high frequency component measurement; high voltage equipment; high-frequency current trnasformer; leakage current; oscilloscope; partial discharge detection techniques; partial discharge identification; substation environment; time domain signatures; Circuit breakers; Electric potential; Electrodes; Needles; Partial discharge measurement; Partial discharges; Sulfur hexafluoride; IEC 60270; circuit breakers; insulation testing; partial discharges; predictive maintenance; sulphur hexafluoride;
Conference_Titel :
Transmission and Distribution Conference and Exposition (T&D), 2012 IEEE PES
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4673-1934-8
Electronic_ISBN :
2160-8555
DOI :
10.1109/TDC.2012.6281515