| Title |
Electrical Characteristics of ZnO Blocks by a Lightning Impulse Current and the Expert System to Diagnose Arrester Deterioration |
| Authors |
길경석(Gil, Gyeong-Seok) ; 한주섭(Han, Ju-Seop) ; 송재용(Song, Jae-Yong) ; 김명진(Kim, Myeong-Jin) ; 김정배(Kim, Jeong-Bae) ; 조한구(Jo, Han-Gu) |
| Keywords |
Lightning arrester ; Leakage current ; Deterioration ; Wave height distribution ; Expert system |
| Abstract |
This paper describes an effect of a single- and a quadruple-lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose arrestor deterioration. To deduce the parameters needed for diagnosing arrester deterioration, an accelerate deterioration teat is carried out. In the experiment, leakage current components are measured. Also, wave height distribution of the leakage current according to the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed conspicuous difference even in an immaterial leakage current increase. Therefore, the use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method by using only a leakage currant value. Finally, the expert system based on the experimental results is developed and the system can diagnose arrestor deterioration by measuring the leakage current and its wade height distribution. |