| Title |
Analysis and Countermeasures for False-Tripping of Earth Leakage Breaker Due to Lightning Surge |
| Authors |
이재복(Lee, Jae-Bok) ; 명성호(Myeong, Seong-Ho) ; 조연규(Jo, Yeon-Gyu) ; 장석훈(Jang, Seok-Hun) ; 김점식(Kim, Jeom-Sik) |
| Keywords |
Earth Leakage Breaker ; Lightning Surge ; False-Tripping ; MOV(Metal Oxide Varistor) |
| Abstract |
Recently it is reported that many a malfunction of ELB which is represented by non-operated type ELB for an impulse wave, is caused by lightning impulse and transient ground potential rise due to nearby lightning strokes. In order to examine the cause of malfunction, 5 samples were investigated experimentally in this study. As each ELB has a different leakage current detecting circuit and wiring method, various characteristics were measured. As a result, all of them brought about malfunctions under the lightning impulse voltage less than 7 kV and the surge current less than 3 kA. Also the different aspects were measured with a polarity of injected surge and a position of MOV to protect the inner circuit of ELB. The Position and effects of protecting devices were suggested as a remedy. |