Transactions of Materials and Heat Treatment

Title：Analysis on reasons of overheating fracture for 35 steel extension rod

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ClassificationCode：TM241

year,vol(issue):pagenumber：2022,47(1):216-221

Abstract：

Extension rod is an important load-bearing connection fitting for transmission lines. Therefore, for an example of an extension rod fracture for 500 kV transmission line, the reasons causing the overheating fracture of extension rod were investigated by macroscopic observation，material composition detection, mechanical performance detection at room temperature and high temperature, metallographic structure observation under different heat treatment conditions，fracture morphology observation and current test of extension rod. The results show that the poor contact or disconnection of jumper conductor clamper causes the extension rod to generate serious heat for a long time owing to passing through large current, the pearlite structure of the extension rod changes from lamellar structure to spherical structure, and creep occurs under the action of wire tension, then the bearing area decreases and the tensile strength has a significant drop, finally fracture occurs on the extension rod under the action of wire tension. Thus, the research provides guide for the line patrolling, installation and repair work of jumper conductor clamper.

Funds：

云南电网科技项目（YNKJXM20180175）

作者简介：郭新良（1971-），男，学士，高级工程师 E-mail：330965365@qq.com

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