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An ultrasonic on-line test method for detecting remotely and automatically energised porcelain post insulators in high-voltage substations

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The fracture of ceramic post insulators in substations is a very important factor which disturbs the normal working of high-voltage (HV) substations. Every year there are some serious grid accidents caused by the fracture of ceramic post insulators in some countries. The fracture is usually caused by the propagation of the crack. Therefore, in this paper, an ultrasonic on-line test method for inspecting automatically the internal crack of the energised porcelain post insulator at 220 kV substations is introduced to prevent the fracture. The correlative ultrasonic detection technology of the energised ceramic post insulators is investigated. Furthermore, an inspection mechanism and robotised inspection system with good insulation safety property and electromagnetic compatibility (EMC) performance are designed. The experimental results show that, even in the high-voltage and strong magnetic field circumstance in substations, the liveline remote inspection of energised porcelain post insulators can be accomplished safely, conveniently, steadily, reliably and effectively with this method.

Keywords: Ceramic/porcelain post insulator; HV substation; crack; insulation and electromagnetic compatibility; remote live-line automatic detection; small angle probe; ultrasonic on-line inspection

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.2008.50.4.209

Affiliations: 1 Received the BSc and MSc degrees in Mechanical Engineering in 2002 and 2005, respectively, from Jiangsu University, Jiangsu, China. At present, he is pursuing a PhD degree at Shanghai Jiaotong University.

Publication date: April 1, 2008

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