| Title |
Characteristics of Ceramic Coupler for On-line Partial Discharge Measurement in High Voltage Rotating Machines |
| Authors |
강동식(Gang, Dong-Sik) ; 윤대희(Yun, Dae-Hui) ; 김용주(Kim, Yong-Ju) ; 이홍식(Lee, Hong-Sik) ; 윤영호(Yun, Yeong-Ho) ; 박정후(Park, Jeong-Hu) |
| Keywords |
회전기 ; 고정자 권선 ; 부분방전 ; 절연진단 ceramic coupler |
| Abstract |
In order to improve the reliability of high voltage rotating machines, it is necessary to understand the breakdown mechanism of stator windings. Especially partial discharge(PD) inception and growth are important in stator winding insulation. Recently, many research on the diagnosis of stator winding insulation for large rotating machines have been developed since the 1970s. Capacitive couplers have been the most widely used sensor for on-line partial discharge detection in rotating machines. This paper deals with the electrical on-line monitor characteristics of ceramic coupler(CC) which has been developed to continuously measure the PD activity in operating high voltage motor stator windings on site. We investigated the electrical characteristics(PD quantity, breakdown voltage and frequency response) to develop CC. This paper presents frequency characteristics and laboratory test result to compare conventional 80([F] epoxy-mica coupler(EMC) and 105[pF] CC for PD measurement with 6.6㎸ model stator windings. |