Analysis of the failure causes of the locking pin in suspension insulators of a transmission line

TONG Yuanhao; MA Ping; BAO Yanrong; YANG Weidong; LI Liang

doi:10.3969/j.issn.1672-3643.2023.04.010

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Analysis of the failure causes of the locking pin in suspension insulators of a transmission line

更新时间：2026-09-14

- Analysis of the failure causes of the locking pin in suspension insulators of a transmission line
- Ningxia Electric Power Issue 4, (2023)
- 作者机构：
- 作者简介：
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- DOI：10.3969/j.issn.1672-3643.2023.04.010
  CLC：
- Online First：12 September 2023，
  
  Published：2023
- 稿件说明：
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TONG Yuanhao, MA Ping, BAO Yanrong, et al. Analysis of the failure causes of the locking pin in suspension insulators of a transmission line[J]. Ningxia Electric Power, 2023, (4).
DOI：

TONG Yuanhao, MA Ping, BAO Yanrong, et al. Analysis of the failure causes of the locking pin in suspension insulators of a transmission line[J]. Ningxia Electric Power, 2023, (4). DOI： 10.3969/j.issn.1672-3643.2023.04.010.

摘要

针对宁夏某输电线路上悬式绝缘子用锁紧销断裂失效的问题，采用宏观检查、化学成分材质分析、金相检测、扫描电镜（scanning electron microscope

SEM)以及能谱仪（energy dispersive spectrometer

EDS)分析等方法进行了分析。研究发现材质为H62黄铜的锁紧销外表面覆盖一层纯铜，纯铜薄厚不均，与黄铜的界面分明，锁紧销裂纹起源于纯铜较厚位置，沿晶扩展，断口内有S元素存在。综合分析认为：锁紧销由表面溶解-再沉积机制主导发生脱锌腐蚀，脱锌后锁紧销表面力学性能下降，受力后服役过程中锁紧销脱锌表面萌生微裂纹，微裂纹以应力腐蚀机制扩展，锁紧销开裂失效。

Abstract

Addressing the fracture failure of locking pins used in suspension insulators on a transmission line in Ningxia

this study employs macroscopic examination

chemical composition analysis

metallographic testing

scanning electron microscope（SEM）

and energy dispersive spectrometer（EDS） for investigation.It was observed that the locking pin

made of H62 brass

was enveloped with an uneven layer of pure copper

which had a clear interface with the brass.The cracking initiated at thicker areas of the copper coating and expanded along the grain boundaries

with sulfur elements present in the fracture.Through a comprehensive analysis

it is concluded that the locking pin experienced dezincification corrosion

primarily driven by the surface dissolution-reprecipitation mechanism

which consequently weakened its mechanical properties.Under stress during operation

micro-cracks formed on the dezincified surface and expanded through stress corrosion

resulting in the locking pin’s fracture failure.

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