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New Diagnostic Technique and Device for Lightning Arresters by Analyzing the Wave Height Distribution of Leakage Currents  

길경석 (한국해양대 전기전자공학부)
한주섭 (한국해양대 산업기술연구소)
송재영 (한국해양대 전기전자공학부)
조한구 (한국전기연구원)
한문섭 (한국철도기술연구원)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers C / v.52, no.12, 2003 , pp. 562-567 More about this Journal
Abstract
Lightning arresters are deteriorated by repetition of protective operation against overvoltages or impulse currents in environments of its use. If a deteriorated arrester is left in power lines, it can lead to an accident such as a line to ground fault even in a normal system. Therefore, it is necessary to eliminate the deteriorated arrester in advance by checking the soundness of arresters on a regular basis, and to ensure the reliability of power systems by preventing accidents. Various deterioration diagnostic techniques and devices are suggested, and most of which measure leakage current components as an indicator of arrester ageing. However, the techniques based on the magnitude of leakage current measure simply RMS or peak value of leakage current components and do not provide detailed information needed in the diagnosis. In this study, we found that the wave height distributions of the total leakage currents are remarkably changed or a new wave height are produced with the progress of arrester deterioration. To propose a new technique for the diagnosis, we designed a leakage current detection unit and an analysis program which can measure leakage current magnitudes and analyze wave height distributions. From the experimental results, we confirmed that the proposed technique by analyzing the wave height distribution can simply diagnose the mode of defects such as a partial damage and an existence of punctures in arresters as well as deterioration of arresters.
Keywords
lightning arresters; overvoltages; deterioration diagnostic techniques; wave height distribution; leakage current detection unit; mode of defects; punctures;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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