Analysis of an Oil-leakage and Heating Defect in a 110 kV Bushing-type Cable Terminal

Liu Hongda

doi:10.13882/j.cnki.ncdqh.2605F012

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Analysis of an Oil-leakage and Heating Defect in a 110 kV Bushing-type Cable Terminal

更新时间：2026-10-07

- Analysis of an Oil-leakage and Heating Defect in a 110 kV Bushing-type Cable Terminal
- Rural Electrification Issue 9, Pages: 47-53(2026)
- 作者机构：
  
  国网浙江省电力公司宁波供电公司,浙江,宁波,315000
- 作者简介：
- 基金信息：
- DOI：10.13882/j.cnki.ncdqh.2605F012
  CLC： TM216
- Published：2026
- 稿件说明：
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刘宏达. 一起110 kV瓷套式电缆终端漏油发热缺陷分析[J]. 农村电气化, 2026, (9): 47-53.

Liu Hongda. Analysis of an Oil-leakage and Heating Defect in a 110 kV Bushing-type Cable Terminal[J]. Rural Electrification, 2026, (9): 47-53.
刘宏达. 一起110 kV瓷套式电缆终端漏油发热缺陷分析[J]. 农村电气化, 2026, (9): 47-53. DOI： 10.13882/j.cnki.ncdqh.2605F012.

Liu Hongda. Analysis of an Oil-leakage and Heating Defect in a 110 kV Bushing-type Cable Terminal[J]. Rural Electrification, 2026, (9): 47-53. DOI： 10.13882/j.cnki.ncdqh.2605F012.

摘要

文章以一起110 kV瓷套式电缆终端漏油发热缺陷为研究对象，结合带电检测技术，通过解体检查及应力锥材料检测，排除了材料本身引起缺陷的可能性；基于终端结构及漏油发热原理，系统分析了漏油发热缺陷的原因。研究发现，缺陷根源在于封铅工艺不良，导致电缆内部受潮，在长时间运行下产生局部放电，引起应力锥烧蚀并出现裂口，最终造成终端漏油发热问题。针对该问题，提出了加强设备全寿命周期管理、深化带电检测及在线监测技术应用等防范措施，为高压电缆施工质量管控及运维管理提供了重要技术参考。

Abstract

Taking an oil-leakage and heating defect in a 110 kV bushing-type cable terminal as the research object

combining it with live detection technology

this study eliminates the possibility that the defect is caused by the material itself through disassembly inspection and stress cone material detection. Based on the terminal structure and the mechanisms of oil-leakage and heating

the causes of the oil-leakage and heating defect are systematically analyzed. The study reveals that the root cause of the defect is poor lead sealing workmanship

which leads to moisture ingress into the cable. During long-term operation

partial discharge is generated

resulting in ablation and cracks on the stress cone

and ultimately causing the oil-leakage and heating of the terminal. In view of this problem

preventive measures are put forward

including strengthening the full-life cycle management of equipment and deepening the application of live detection and online monitoring technologies

which provide an important technical reference for the construction quality control and operation management of high-voltage cables.

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references

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