Penetration Depth of Critical Refraction Longitudinal Waves in Epoxy Resin Insulating Spacer

ZHANG Jie; WANG Wei; XU Yudong; SONG Jiancheng; LIN Lingyan; ZHANG Jianhua; ZHANG Kai

doi:10.13296/j.1001-1609.hva.2025.07.017

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Penetration Depth of Critical Refraction Longitudinal Waves in Epoxy Resin Insulating Spacer

Research & Analysis | 更新时间：2025-06-30

- Penetration Depth of Critical Refraction Longitudinal Waves in Epoxy Resin Insulating Spacer
- High Voltage Apparatus Vol. 61, Issue 7, Pages: 142-149(2025)
- 作者机构：
  
  1.太原理工大学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.2025.07.017
  CLC：
- Received：03 January 2025，
  
  Revised：07 March 2025，
  
  Published：16 July 2025
- 稿件说明：
移动端阅览
ZHANG Jie, WANG Wei, XU Yudong, et al. Penetration Depth of Critical Refraction Longitudinal Waves in Epoxy Resin Insulating Spacer[J]. High voltage apparatus, 2025, 61(7): 142-149.
DOI：

ZHANG Jie, WANG Wei, XU Yudong, et al. Penetration Depth of Critical Refraction Longitudinal Waves in Epoxy Resin Insulating Spacer[J]. High voltage apparatus, 2025, 61(7): 142-149. DOI： 10.13296/j.1001-1609.hva.2025.07.017.

摘要

GIS盆式绝缘子在制造加工过程中会产生残余应力，残余应力会降低绝缘子的机械强度并最终导致其破裂，这是影响绝缘子安全运行的重大安全隐患。临界折射纵波（L

）对材料应力极为敏感，它可以用于检测盆式绝缘子的残余应力。文中分析了L

波法检测环氧材料不同深度内部应力的原理，建立了L

波在环氧复合材料中传播的有限元仿真模型，研究了不同频率L

波在环氧中的传播特性，得到常见频率下L

波在环氧材料中传播深度表达式，并进行了实验验证。结果表明，L

波在环氧复合材料的渗透深度随着波的频率的增加而衰减，通过改变探头产生的L

波频率，可准确控制L

波在环氧复合材料中的渗透深度，进而可以计算材料在该深度下的平均应力。这不仅可以为盆式绝缘子残余应力出厂检测，也可以为运行中盆式绝缘子的状态监测提供理论指导和技术支持。

Abstract

Insulating spacer for GIS can produce residual stress during manufacturing process

which in turn reduces the mechanical

strength of the insulating spacer and eventually leads to its rupture and is a major safety hazard affecting safe operation of the insulating spacer. The critical refractive longitudinal waves (L

) are extremely sensitive to material stress and can be used to detect the residual stresses of the insulating spacer. In this paper

the principle of L

wave method for detecting internal stresses at different depths of epoxy materials is analyzed

a finite element simulation model of L

wave propagation in epoxy composite material is set up through simulation

the propagation characteristics of L

waves of different frequencies in epoxy are studied

and the expression of L

wave propagation depth in epoxy materials at common frequencies is obtained and experimental verification is performed. The results show that the penetration depth of L

waves in the epoxy composite material attenuates with the increase of the frequency of the wave

and the penetration depth of the L

wave in the epoxy composite material is accurately controlled by changing the L

wave frequency generated by the probe

thus the average stress of the material at this depth can be calculated. This can not only provide theoretical guidance and technical support for delivery detection of residual stress of insulating spacer

but also for the condition monitoring of the insulating spacer in operation.

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