邓红雷,韩飞阳,王鹏宇,连捷辉,刘刚
DENG Honglei,HAN Feiyang,WANG Pengyu,LIAN Jiehui,LIU Gang

• 1:华南理工大学电力学院
• 2:广东技术师范大学自动化学院

摘要(Abstract)：

目前，在运海底电缆（以下简称“海缆”）三相金属护套间多采用绝缘或半导电聚乙烯护套隔离，这使得三相感应电压无法完全抵消，在护套两端直接接地方式下易形成较大的护套环流。大环流产生的热效应使得金属护套接地连接处热烧蚀故障频发，因此有必要对该类型故障机理进行研究。以一起真实海缆金属护套接地连接处热烧蚀故障为例，通过对故障样品的解体检查，分析了故障的典型特征。结合电磁暂态仿真软件和有限元仿真软件，分析了海缆金属护套与接地线不同接触状态下的接触面温度场分布。仿真结果基本还原了实际故障特征，验证了海缆金属护套接地连接处热烧蚀故障的发生机理，为海缆接地系统异常现象预警技术的提出奠定了基础。
Currently, submarine cables in operation(hereinafter referred to as “submarine cables”) commonly use insulated or semi-conductive polyethylene sheaths to isolate the three-phase metal sheaths, preventing complete cancellation of the induced voltage between the phases. As a result, significant sheath circulating currents can develop in the sheath when it is directly grounded at both ends. The thermal effects of these large circulating currents lead to frequent thermal ablation faults at the grounding connection of the metal sheath. Therefore, it is crucial to study the mechanism behind such fault. Using a real-life example of a thermal ablation fault at the metal sheath grounding connection of a submarine cable, the typical characteristics of the fault were analyzed through a disassembly inspection of the fault sample. Electromagnetic transient simulation software and finite element simulation software were used to analyze the temperature field distribution at the contact surface under different contact states between the submarine cable's metal sheath and the grounding conductor. The simulation results largely replicated the actual fault characteristics, validating the fault mechanism of thermal ablation at the grounding connection of the submarine cable's metal sheath. This research lays the foundation for the development of anomaly warning technologies for submarine cable grounding systems.

关键词(KeyWords)： 海底电缆;金属护套;接地系统;接触电阻;热烧蚀
submarine cables;metal sheath;grounding system;contact resistance;thermal ablation

Abstract:

Keywords:

基金项目(Foundation): 广东省基础与应用基础研究基金（2022A1515012523）

作者(Author): 邓红雷,韩飞阳,王鹏宇,连捷辉,刘刚
DENG Honglei,HAN Feiyang,WANG Pengyu,LIAN Jiehui,LIU Gang

DOI: 10.19585/j.zjdl.202505011

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