中国电机工程学报2016，Vol.36Issue(24)：6682-6692,11.DOI:10.13334/j.0258-8013.pcsee.161822
直流叠加冲击电压下HVDC电缆暂态电场分布特性研究
Research on the Transient Electric Field Distribution in HVDC Cable Under DC Voltage Superimposed Impulse Voltages
摘要
Abstract
HVDC cables in operation will endure the lightning or switching impulse voltages superimposed on the DC working voltage, the steady DC electric field distribution and the transient electric field distribution under the impulse voltages superimposed on the DC voltage should be considered at the same time during the cable insulation structure design. Due to the conductivity of HVDC cable insulation as a function of the electric field and temperature, the transient electric field distribution in HVDC cable under the lightning and switching impulse voltage is more complex. Therefore, the effects of the temperature gradient, the applied voltage pattern and the nonlinear conductivity properties of the insulating materials on the transient field were studied with the COMSOL Multiphysics simulation software, for the cable insulation under the DC voltage superimposed impulse voltages. The research results show that: the transient maximum field is always appeared in the insulation near to the inner shield surface during applied the DC superposed impulse voltages on the cable insulation; for the certain cable structure, the certain nonlinear properties of insulating materials and the certain superposed impulse voltage amplitude, increasing the temperature gradient in the insulation reduce the transient maximum field under the DC superposed with same polarity impulse voltages, and increase the transient maximum field under the DC superposed with reverse polarity impulse voltage; to reduce material conductance activation energy and to increase field dependence coefficient can effectivelyimprove the transient electric field distribution, reduce the amplitude and shorten the head and tail time of the transient maximum electric field wave.关键词
HVDC 电缆/温度梯度/冲击电压/暂态电场/非线性电导率Key words
HVDC cable/temperature gradient/impulse voltage/transient electric field/nonlinear conductivity分类
信息技术与安全科学引用本文复制引用
郑欢,刘乐乐,李忠华..直流叠加冲击电压下HVDC电缆暂态电场分布特性研究[J].中国电机工程学报,2016,36(24):6682-6692,11.基金项目
国家重点基础研究发展计划项目(973项目)(2014CB239504)；国家自然科学基金项目(51177029)。 The National Basic Research Program of China (973 Program)(2014CB239504) （973项目）
Project Supported by the National Natural Science Foundation of China (51177029) （51177029）
