| Title |
Development and Site Evaluation of the On-line Partial Discharge Measuring System on the 13 kV Class Stator Windings for Hydro Generator |
| Authors |
선종호(Sun, Jong-Ho) ; 황돈하(Hwang, Don-Ha) ; 윤영호(Yun, Young-Ho) ; 신병철(Shin, Byoung-Chol) ; 오봉근(Oh, Bong-Keun) ; 강동식(Kang, Dong-Sik) |
| Keywords |
수력발전기 ; 고정자 권선 ; 부분방전 ; 절연열화 On-line Monitoring ; Ceramic Coupler |
| Abstract |
In order to improve the reliability of stator windings for hydro generators, it is necessary to detect the defective point and life assessment of the high voltage windings. Especially the on-line partial discharge (PD) test provides the ability to monitor effects, such as slot discharge, internal discharge, and end-winding discharge without interrupting generators, this method has been proven the major testing technology in high voltage rotating machines nowadays. The purpose of this paper is to describe the method of the on-line PD measurement on stator windings for hydro-generator with 13 [kV] class ceramic coupler (CC), on-line PD measuring system, terminal box, and index parameters. Also, the developed PD measuring system and 13 [kV] class CC were installed Daechung-dam generator #2. It was found that this installed sensor and system had good electrical characteristics to detect PD activity during the operating condition with its detection frequency band is between several and several tens MHz. |