Study on Physicochemical and Charge Characteristics of EPDM Insulation for 110 kV Cable Accessories

WAN Zijian; ZHANG Wei; TAN Xiao; CHEN Zhaoyang; XIE Kun; XIE Qing; REN Chengyan

doi:10.13296/j.1001-1609.hva.2026.03.018

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Study on Physicochemical and Charge Characteristics of EPDM Insulation for 110 kV Cable Accessories

Research & Analysis | 更新时间：2026-03-11

- Study on Physicochemical and Charge Characteristics of EPDM Insulation for 110 kV Cable Accessories
- High Voltage Apparatus Vol. 62, Issue 3, Pages: 144-152(2026)
- 作者机构：
  
  华北电力大学输变电设备安全防御重点实验室，河北保定 071000
  中国科学院电工研究所等离子体科学和能源转化北京市国际科技合作基地，北京 100190
  国网江苏省电力有限公司电力科学研究院，南京 211103
  国网江苏省电力有限公司常州供电分公司，江苏常州 213004
  华北电力大学新能源电力系统国家重点实验室，北京 102206
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.03.018
  CLC：
- Received：25 July 2025，
  
  Revised：2025-10-28，
  
  Published：16 March 2026
- 稿件说明：
移动端阅览
WAN Zijian, ZHANG Wei, TAN Xiao, et al. Study on Physicochemical and Charge Characteristics of EPDM Insulation for 110 kV Cable Accessories[J]. High Voltage Apparatus, 2026, 62(3): 144-152.
DOI：

WAN Zijian, ZHANG Wei, TAN Xiao, et al. Study on Physicochemical and Charge Characteristics of EPDM Insulation for 110 kV Cable Accessories[J]. High Voltage Apparatus, 2026, 62(3): 144-152. DOI： 10.13296/j.1001-1609.hva.2026.03.018.

摘要

电缆附件是输电线路运行中易发生故障的薄弱环节，为探究不同运行年限高压电缆附件绝缘老化状态的变化，对三元乙丙橡胶（ethylene propylene diene monomer，EPDM）绝缘110 kV高压电缆附件微观结构、化学组成、电气性能和表面电荷特性进行观测和分析。结果表明：随运行年限增加，附件在多种因素作用下发生老化，EPDM绝缘击穿场强整体呈下降趋势，陷阱能级向浅陷阱偏移，浅陷阱电荷密度增大。附件绝缘在老化过程中引入C=O、-OH等极性基团，同时和硅油反应引入含Si基团，使EPDM介电常数增加；另一方面，绝缘电热老化后期产生的强极性基团等化学缺陷可使EPDM陷阱能级加深，同时深陷阱密度增加，而老化过程中出现的重结晶现象有利于击穿场强的保持和提升。EPDM绝缘的击穿场强和陷阱参数受附件类型和材料制备工艺影响较小，能较好地反映高压电缆附件的绝缘老化状态。

Abstract

Cable accessories are weak links with frequent failure in the operation of transmission line. For exploring the variation of insulation aging status of high-voltage cable accessories withdifferent service years

the microstructure

chemical composition

electrical performanceand surface charge characteristics of Ethylene Propylene Diene Monomer (EPDM) insulated 110 kV high-voltage cable accessories are measured and analyzed. The results show that with the increase of service years

the aging of the accessoriesis occurred under multiple factors.The breakdown field strength of EPDM insulation shows a downward trend as a whole

the trap energy level shifts towards shallow trap

and the charge density of shallow trap increases. During the aging process

polar groups such as C=O and-OH are introduced into the accessories insulation. At the same time

rections with silicone oil introduces Si-containing groups collectively leading to an increase in the dielectric constant of EPDM. On the other hand

such chemical defect as extremely strong functional group which has occurred at the later stage of insulation electrical heating keeps the EPDM trap trap energy level deepen and

at the same time

the deep trap density increases. However

the recrystallization phenomenon in the aging process is beneficial for maintaining and enhancing the breakdown field strength. The breakdown field strength and trap parameters of EPDM are less affected by the type of cable accessories and material preparation technology

which can better reflect theaging status of high-voltage cable accessories.

关键词

Keywords

references

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