Detection on Looseness of Flange Bolt of Insulating Spacer Based on Critical Refraction Longitudinal Wave Method

GE Jian; WANG Wei; SONG Jiancheng; JIAO Guoxun; LI Pengjiang; GAO Jinwu; REN Hongqiu

doi:10.13296/j.1001-1609.hva.2024.04.020

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Detection on Looseness of Flange Bolt of Insulating Spacer Based on Critical Refraction Longitudinal Wave Method

Research & Analysis | 更新时间：2025-04-26

- Detection on Looseness of Flange Bolt of Insulating Spacer Based on Critical Refraction Longitudinal Wave Method
- High Voltage Apparatus Vol. 60, Issue 4, Pages: 165-172(2024)
- 作者机构：
  
  1.太原理工大学煤矿电气设备与智能控制山西省重点实验室，矿用智能电器技术国家地方联合工程实验室，太原　 030024
  2.国网山西省电力公司电力科学研究院，太原　 030001
- 作者简介：
- 基金信息：
  
  State Grid Shanxi Electric Power Company Science and Technology Project (GIS Basin Insulator Stress Detection Based on Ultrasonic Key Technology Research and Application)
- DOI：10.13296/j.1001-1609.hva.2024.04.020
  CLC：
- Received：23 December 2023，
  
  Revised：25 February 2024，
  
  Published：16 April 2024
- 稿件说明：
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GE Jian, WANG Wei, SONG Jiancheng, et al. Detection on Looseness of Flange Bolt of Insulating Spacer Based on Critical Refraction Longitudinal Wave Method[J]. High voltage apparatus, 2024, 60(4): 165-172.
DOI：

GE Jian, WANG Wei, SONG Jiancheng, et al. Detection on Looseness of Flange Bolt of Insulating Spacer Based on Critical Refraction Longitudinal Wave Method[J]. High voltage apparatus, 2024, 60(4): 165-172. DOI： 10.13296/j.1001-1609.hva.2024.04.020.

摘要

盆式绝缘子是GIS的关键绝缘器件，与两侧气室法兰通过螺栓进行紧固连接，当螺栓松动时会导致盆式绝缘子应力分布不均，从而影响GIS运行的安全性和稳定性。文中提出了一种基于超声临界折射纵波（L

）的盆式绝缘子法兰螺栓松动检测方法，根据L

波在盆式绝缘子法兰表面的传播声时差来反映螺栓松动情况。结果表明，当相邻螺栓松动时，L

波在松动螺栓之间的法兰表面声时差变化最大，且变化量大于24 ns；当不相邻螺栓松动时，L

波在松动螺栓正对的法兰表面声时差变化最大，且声时差变化量大于10 ns，并且螺栓松动程度越大，超声传播声时差变化量越大。该检测方法可实现对盆式绝缘子法兰螺栓松动的检测，判断螺栓松动数量及位置，具有一定的工程实用价值。

Abstract

Insulating spacer is the key insulation element of GIS. It is fastened and connected with the flanges of the gas compartment on both sides by bolts. The bolts

in case of loose

will lead to uneven stress distribution of insulating spacer

thus affecting both safety and stability of the insulating spacer. In this paper

a method for detecting the bolt looseness of

insulating spacer flanges based on ultrasonic critically refracted longitudinal waves (L

) is proposed. The looseness of bolts is reflected in accordance with the acoustic time difference of L

wave propagation on the surface of the insulating spacer flanges. The results show that

in case of looseness of the adjacent bolts

the L

wave has the largest change in the flange surface acoustic time difference between the loose bolts

and the magnitude of variation is greater than 24 ns; While

when the non-adjacent bolts are loose

the acoustic time difference on the surface of flange of L

on the opposite side of the loose bolt is maximum and the acoustic time difference is greater than 10 ns

and the greater the bolt looseness

the greater the ultrasonic propagation acoustic time difference. The detection method can achieve the detection of the looseness of the flange bolts of the insulating spacer

judge the number and position of the loosening of the bolts and has certain engineering practical value.

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