NDLI: Thermal impact characteristics by forest fire on porcelain insulators for transmission lines

Content Provider	IEEE Xplore Digital Library
Author	Se-Won Han In-Hyuk Choi Dong-Il Lee
Copyright Year	2007
Description	Author affiliation: Adv. Mater. & Applic. Res. Lab., KERI, Changwon (Se-Won Han)
Abstract	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 300degC thermal impact gradient (-70 to 230degC), 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 200-600degC, 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 300degC, 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 300degC is about 0.1%. Above 1% displacement, it is expected that the most porcelain insulators would fail.
Starting Page	118
Ending Page	121
File Size	1059175
Page Count	4
File Format	PDF
ISBN	9781424404469
DOI	10.1109/EEIC.2007.4562601
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fires Porcelain Insulation Transmission lines Voltage Ovens Insulator testing Temperature control Thermal stresses Power transmission lines
Content Type	Text
Resource Type	Article

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