Analysis on the Strain Clamp Fracture of ACCC

doi:10.11930/j.issn.10.11930.2015.10.97

Abstract

Abstract: A structure testing was conducted on the disabled ACCC strain clamp of a 220 kV transmission line. It was found that the line for hydraulic crimping on the aluminum tube was wrongly positioned after crimping, which resulted in local stress concentration, and the assembly quality of strain clamp was not in conformity with the requirements of the specification. A series tests are conducted, including the holding force test of wedge clamp and aluminum tube, the temperature-rise test of drainage board, and the influences of the clamp assembly and the temperature rise on holding force are discussed. It is concluded that the poor installed drainage board with heavy current generates an enormous amount of heat, which decreases the holding force of clamp, and leads to the temperature rise of aluminum tube. As a result, the aluminum tube may break with loading and the carbon fiber composite core rod may fall off from the wedge clamp. The technical requirements for the installation and safe operation of strain clamp are presented.

Key words: aluminum conductor composite core (ACCC), strain clamp, fracturing analysis, holding force of clamp

CLC Number:

TM727

LIU Chun, CHEN Hongdong, OUYANG Kejian, TANG Yuanfu, HE Pengfei, LI Wenbo, GONG Jing. Analysis on the Strain Clamp Fracture of ACCC[J]. journal1, 2015, 48(10): 97-100.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.10.97

https://www.electricpower.com.cn/EN/Y2015/V48/I10/97

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