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In this study the thermal impact characteristics by forest fire are extensively investigated using temperature controlled ovens. The test conditions for thermal impact damage are simulated according to the characteristics of natural forest fire. The test pieces are suspension porcelain insulators made by KRI in 2005 for transmission lines. In the thermal impact cycle tests with 300 캜 thermal impact gradient (-70 to 230 캜), cycling in 10 minute periods, no critical failures occurred in the test samples even with long cycle times. But in tests with thermal impact gradient from room temperature to 200-600 캜, cycling in 10 to 30 minute periods, there were critical failures of the porcelain insulators according to the thermal impact gradient and quenching method. In the case of thermal impact by forest fire, it was found of that duration time is more important than the cycling time, and the initiation temperature of porcelain insulator failures is about 300 캜, in the case of water quenching, many cracks and fracture of the porcelain occurred. It was found that the thermal impact failure is closely related to the displacement in the cement by thermal stress as confirmed by simulation. It was estimated that the initiation displacement by the thermal impact of 300 캜 is about 0.1 %. Above 1 % displacement, it is expected that the most porcelain insulators would fail.

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Thermal impact characteristics by forest fire on porcelain insulators for transmission lines Won-Kyo Lee ;In-Hyuk Choi ;Jong-Kee Choi ;Kab-Cheol Hwang ;Se-Won Han pp.143-146

Accelerating aging of transmission line porcelain suspension insulators by autoclaving Won-Kyo Lee ;In-Hyuk Choi ;Koo-Yong Shin ;Kab-Cheol Hwang ;Se-Won Han pp.147-150

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Characterization of electrical properties and gating effect of single wall carbon nanotube field effect transistor Jinhee Heo ;Kyohyeok Kim ;Ilsub Chung pp.169-172

A vascular characteristic index of blood pressure variation using the pulse wave signal Dong-Keun Jung ;Jeong-seo Ha ;Gu-Tae Kang ;Soo-Young Ye ;Gi-Ryon Kim ;Gye-Rok Jeon pp.173-178

참고문헌 (6건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
1 E.A. Johnson, (2001) Forest Fires in: Modeling fire temperature maxima, Academic Press 미소장
2 S. W. Han, (2003) Study on performance and aging test of porcelain insulators for transmission line, J. of KIEEME(in Korean) 미소장
3 K. Morita, (1997) Study on long term reliability of suspension insulators, TIEE Japan 미소장
4 S. W. Han, (2002) A study on electrical and mechanical simulation for designing porcelain insulators with high strength, ICEE 2002 Proceeding 미소장
5 Cement Growth Failure of Porcelain Suspension Insulators 네이버 미소장
6 J. BelleriveJ.Bellerive, (1990) “Performance of porcelain insulator, forty years experiences at Hydro Quebec”, CEA Paper, March, 1990, 미소장

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