Measurement Device of Resistive Leakage Current for Arrester Deterioration Diagnosis

피뢰기 열화진단을 위한 저항분 누설전류의 측정장치

  • 길경석 (한국해양대학 전기전자공학부) ;
  • 한주섭 (한국해양대학 산업기술연구소) ;
  • 김정배 ((주)효성 중공업연구소)
  • Published : 2003.10.01

Abstract

Resistive leakage current flowing ZnO blocks increases with its ages, which is an important indicator of arrester deterioration. However, a complicated circuitry is essential to measure the resistive leakage current included in the total leakage current, and the difficult handling of the measurement makes few applications to the fields. In this paper, we propose a resistive leakage current measurement device which is composed of a current detection circuit and an analysis program operated on a microprocessor. The device samples the input leakage current waveform digitally, and discriminate the zero-cross and the peak point of the waveform to analyze the current amplitude vs. phase. The capacitive leakage current is then eliminated from the total leakage current by using an algorithm to extract the resistive leakage current only. Also, the device can be operated automatically and manually to analyze the resistive leakage current even when the leakage current waveform is distorted due to various types of arrester deterioration. To estimate the performance of the device, we carried out a test on ZnO blocks and lightning arresters. From the results, it is confirmed that the device could analyze most parameters needed for the arrester diagnostics such as total leakage current. resistive leakage current, and the $3^rd$ harmonic leakage current.

Keywords

resistive leakage current;deterioration;measurement device;microprocessor;arrester diagnostics;harmonic leakage current

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