Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Analysis on Damage of Porcelain Insulators Using AE Technique

AE기법을 이용한 자기애자의 손상 분석

  • Choi, In-Hyuk (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Shin, Koo-Yong (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Lim, Yun-seog (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Koo, Ja-Bin (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Son, Ju-Am (Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Lim, Dae-Yeon (Department of Safety Engineering, Incheon National University) ;
  • Oh, Tae-Keun (Department of Safety Engineering, Incheon National University) ;
  • Yoon, Young-Geun (Department of Safety Engineering, Incheon National University)
  • 최인혁 (한국전력공사 전력연구원) ;
  • 신구용 (한국전력공사 전력연구원) ;
  • 임윤석 (한국전력공사 전력연구원) ;
  • 구자빈 (한국전력공사 전력연구원) ;
  • 손주암 (한국전력공사 전력연구원) ;
  • 임대연 (인천대학교 안전공학과) ;
  • 오태근 (인천대학교 안전공학과) ;
  • 윤영근 (인천대학교 안전공학과)
  • Received : 2019.01.20
  • Accepted : 2020.02.24
  • Published : 2020.05.01
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Abstract

This paper investigates the soundness of porcelain insulators associated with the acoustic emission (AE) technique. The AE technique is a popular non-destructive method that measures and analyzes the burst energy that occurs mainly when a crack occurs in a high-frequency region. Typical AE methods require continuous monitoring with frequent sensor calibration. However, in this study, the AE technique excites a porcelain insulator using only an impact hammer, and it applies a high-pass filter to the signal frequency range measured only in the AE sensor by comparing the AE and the acceleration sensors. Next, the extracted time-domain signal is analyzed for the damage assessment. In normal signals, the duration is about 2ms, the area of the envelope is about 1,000, and the number of counts is about 20. In the damage signal, the duration exceeds 5ms, the area of the envelope is about 2,000, and the number of counts exceeds 40. In addition, various characteristics in the time and frequency domain for normal and damage cases are analyzed using the short-time Fourier transform (STFT). Based on the results of the STFT analysis, the maximum energy of a normal specimen is less than 0.02, while in the case of the damage specimen, it exceeds 0.02. The extracted high-frequency components can present dynamic behavior of crack regions and eigenmodes of the isolated insulator parts, but the presence, size, and distribution of cracks can be predicted indirectly. In this regard, the characteristics of the surface crack region were derived in this study.

Keywords

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