交流与交直流复合电压下“液–固”油纸绝缘体系界面电荷分布的仿真及推演模型研究  

Simulation and Deduction Model of Interface Charge Distribution of “Liquid-Solid” Oil Paper Insulation System Under AC and AC/DC Composite Voltage

作　　者：邹润豪 廖瑞金[1] 郝建[1] 刘丛 吴洁 ZOU Runhao;LIAO Ruijin;HAO Jian;LIU Cong;WU Jie(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《高电压技术》2021年第4期1391-1402,共12页High Voltage Engineering

基　　金：国家重点研发计划(2017YFB0902704,2017YFB0902700)。

摘　　要：空间电荷/界面电荷问题是影响换流变压器阀侧出线装置绝缘性能的关键因素。研究并掌握"液–固"油纸绝缘在交流以及交直流复合电压下的界面电荷特性将有助于中国特高压输电系统的发展。该文利用数值仿真方法,对"液–固"油纸绝缘在交流和交直流复合电压下的界面电荷特性进行研究。首先对交流和交直流复合电压下"液–固"油纸绝缘体系的空间/界面电荷仿真方法进行研究,然后聚焦交流电压下空间/界面电荷随相位存在动态变化的特点,开展交流和交直流复合电压下"液–固"油纸绝缘体系空间/界面电荷分布仿真分析及推演计算模型研究。研究结果表明:采用该文所提出的多层"液–固"油纸绝缘体系空间/界面电荷仿真方法计算的结果与电声脉冲法实测电荷密度值相比,误差小于1%;界面电荷密度随场强和温度的增大呈指数规律增加;稳态界面电荷密度随交直流复合比例(直流电压与交流幅值之比)的增大而增大并逐渐达到稳定值;在此规律基础上,建立了一种适用于交流与交直流复合电压下多层"液–固"油纸绝缘体系界面电荷分布的推演计算模型。Space/interface charge is a key factor affecting the insulation performance of valve side outlet device of converter transformer. Studying and understanding the interface charge characteristics of "liquid-solid" oil paper insulation under AC and AC/DC composite voltage will contribute to the development of UHV transmission system in China. By means of numerical simulation, this paper studies the interface charge characteristics of "liquid-solid" oil paper insulation under AC and AC/DC composite voltages. Firstly, the simulation method of space/interface charge of "liquid-solid" oil paper insulation system under AC and AC/DC composite voltages is studied. Then, focusing on the dynamic change of space/interface charge with phase under AC voltage, the simulation analysis and deduction calculation model of space/interface charge distribution of "liquid-solid" oil paper insulation system under AC and AC/DC composite voltage are carried out. The research results show that, for multi-layer "liquid-solid" system, the error between the simulation result and the experimental result is less than 1%. The interface charge density increases exponentially with the increase of field strength and temperature;the steady-state interface charge density increases with the increase of AC/DC composite ratio(the ratio of DC voltage to AC amplitude) and gradually reaches a stable value. On the basis of previous study results, a model to calculate the interface charge of multi-layer "liquid-solid" oil paper insulation system under AC and AC/DC composite voltages is established.

关 键 词：油–纸绝缘 场温联合 液–固界面 界面电荷 推演模型 

分 类 号：TM72[电气工程—电力系统及自动化]