大长度高压直流电缆中电荷的产生、测量及释放研究综述

Review on Charge Generation, Measurement and Dissipation in Large-length HVDC Cable

摘要:

碳减排作为能源转型的核心驱动力之一，能够有效促进清洁能源发展，缓解全球温室效应。在全球能源互联网发展的背景之下，用于长距离、跨地区输电的大长度直流电缆在电力互联网中占据着重要地位。同时，直流电缆工作时间较长，维护工作较为困难，而电缆中又不可避免会出现电荷积累问题，其中的残余电荷将威胁电缆的安全运行，降低电缆的使用寿命，甚至可能造成电缆故障。因此，有必要对大长度直流电缆的电荷问题开展相关研究。从直流电缆中电荷的产生、测量和释放3个方面进行概述，总结了近年来相关研究中的热点问题，对未来热门研究方向给出参考。所做研究对大长度直流电缆的在线监测和寿命评估均具有重要的指导意义。

Abstract:

Carbon emission reduction, as one of the core drivers of energy transformation, can effectively promote clean energy development and mitigate global greenhouse effect. In the context of the development of global energy internet, large-length HVDC cables for long-distance and cross-regional power transmission occupy an essential position in power internet. However, the accumulation of electric charges in large-length HVDC cables is inevitable, and would threaten the safe operation of cables, reduce their service life and might even cause insulation fault. Therefore, it is necessary to study the electric charges in large-length HVDC cables. A brief overview of electric charge generation, measurement and release in HVDC cables is provided, and the important research issues in recent years are summarized, which has important guiding significance for both online monitoring and life assessment of large-length HVDC cables.