An Ultrasonic Pulse-Echo Method to Detect Internal Defects in Epoxy Composite Insulation

Fangyuan Tian, Yanpeng Hao, Zhouyiao Zou, Yao Zheng, Weiming He, Lin Yang and Licheng Li
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Fangyuan Tian: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yanpeng Hao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Zhouyiao Zou: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yao Zheng: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Weiming He: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Lin Yang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2019, vol. 12, issue 24, 1-17

Abstract: Voids or cracks in basin insulators inside a GIS (gas-insulated metal-enclosed switchgear) could trigger partial discharges or surface flashover under electrical stresses, threatening safe GIS operation. For this paper, some epoxy composite specimens were made from similar materials and manufacturing processes to make 252 kV GIS basin insulators. Some voids with different diameters or cracks with different diameters and orientations were artificially made in the specimens with different thicknesses. An ultrasonic pulse-echo system was set up, and ultrasonic tests were carried out on the specimens with voids or cracks. A method to calculate the depth of a defect was proposed by the propagation time of defect reflected waves. The results showed that a depth of 50 mm, a diameter φ of 2 mm void, and a diameter φ of 1 mm crack in epoxy composite insulation were detected by the ultrasonic system using a 1 MHz transducer.

Keywords: basin insulator; internal defect; ultrasonic pulse-echo (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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