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Journal of Korean Institute of Fire Science and Engineering 2006;20(3):35-41.
Published online September 30, 2006.
22.9 kV용 변압기 부싱 절연 커버의 실태 조사 및 열화 특성
최충석, 김향곤, 한운기, 이기연
1전기안전연구원(한국전기안전공사)2전기안전연구원(한국전기안전공사)3전기안전연구원(한국전기안전공사)4전기안전연구원(한국전기안전공사)
The Deterioration Properties and Actual Conditions of Insulation Cover used at 22.9 kV Transformer Bushing
Choi Chung-Seog, Kim Hyang-Kon, Han Woon-Ki, Lee Ki-Yeon
요약
본 논문에서는 22.9 kV용 변압기 부싱 절연 커버의 실태조사를 실시하였다. 절연 커버에 열적 스트레스를 인가하여 열화 패턴, 열 중량 변화, 적외선 특성 등을 해석하여 전기사고 원인 분석을 위한 근거를 제시하고자 한다. 노출된 변압기 단자를 보호하기 위해 설치한 절연 커버의 크기 및 길이가 부적절한 것이 확인되었다. 절연 커버에 $150^{circ}C$의 열적 스트레스를 인가한 경우 플라스틱 절연 커버(A, B, D, E)는 심한 변형이 일어났으나, 고무 절연 커버 C는 정상이었다. 열 중량 분석 결과 절연 커버 A는 $307.8{sim}405.9^{circ}C$에서 33.3%의 감소가 있었으며, 절연 커버 C는 $258.8{sim}332.9^{circ}C$에서 53.7%의 감소가 발생하였다. FT-IR 분석에서 플라스틱 절연 커버는 $CH_2,;CH_3$, C=O, C=C 결합 구조를 갖는 것으로 나타났으며, 고무 절연 커버는 OH, $CH_2,;CH_3$, C=O, C=N, C=C 등의 결합인 것을 알 수 있었다.
Abstract
In this study, we presented the problems in the insulation cover of 22.9kV transformer bushing through investigating actual conditions. After thermal stress applied to the insulation cover, deterioration patterns, thermogravimetric and infrared characteristics were analyzed, and the results were applied to the cause analysis of accidents and judgement of safety. The insulation covers are used to protect exposed terminals of transformer, but they had improper size and length. Therefore, they could not show efficient insulation function. In case that thermal stress of $150^{circ}C$ was applied to the insulation covers, plastic insulation covers(A, B, D, E) damaged severely, whereas rubber insulation cover(C) showed normal shapes. In the result of thermogravimetric analysis, the thermal gravity of plastic covers(A) decreased about 33.3% at $307.8^{circ}C;to;405.9^{circ}C$. and he thermal gravity of rubber covers (C) decreased about 53.7% at $258.8^{circ}C;to;32.9^{circ}C$. In the result of FT-IR analysis, plastic covers showed peaks characteristic of $CH_2,;CH_3$, C=O and C=C bonds, whereas rubber covers showed peaks characteristic of OH, $CH_2,;CH_3$, C=O, C=N and C=C bonds.
Key Words: Transformer bushing, Insulation cover, Deterioration, TGA, FT-IR
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