直流叠加冲击电压试验回路保护电阻参数选择与外形优化  

Parameter Selection and Shape Optimization of Protective Resistance for DC Superimposed Impact Test Circuit

作　　者：张贵富 傅中 程登峰 朱太云 朱胜龙 吴正阳 ZHANG Guifu;FU Zhong;CHENG Dengfeng;ZHU Taiyun;ZHU Shenglong;WU Zhengyang(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei 230009,China;State Grid Anhui Electric Power Research Institute of Anhui Electric Power Grid Co.,Ltd.,Hefei 230022,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]国网安徽省电力有限公司电力科学研究院,合肥230022

出　　处：《南方电网技术》2021年第3期75-82,共8页Southern Power System Technology

基　　金：国家电网公司科技项目(特高压GIS长母线充电暂态过电压及绝缘提升措施研究)(SGSDJS00TGJS1900012)。

摘　　要：在最大900 kV直流叠加1800 kV操作或2400 kV雷电冲击电压的试验中,需要设计特殊的电阻元件保护直流电压发生器免受冲击电压的损坏。本文通过仿真计算,对直流叠加冲击电压试验回路中保护电阻的阻值进行了选取,同时基于试验时发生的外绝缘闪络,对电阻丝绕法与电极外形进行了优化,结果表明:保护电阻阻值选择500 kΩ,可满足保护直流电压发生器的要求;保护电阻外绝缘长度选择10 m,电阻丝绕法采用双线对绕,高压端电极配置环径2700 mm、罩深500 mm、管径250 mm的均压环,可明显改善电阻上电压分布和电场分布,满足不发生外绝缘闪络的要求。In the test of the maximum 900 kV DC superimposed 1800 kV operating or 2400 kV lightning impulse voltage,a special resistor element needs to be designed to protect the DC voltage generator from being damaged by the impulse voltage,and the appropriate shape is designed of the resistor to prevent flashover.Based on the simulation calculations,the resistance value is selected in the DC superimposed impact test circuit.And based on the external insulation flashover occurred during the test,the resistance wire winding method and the electrode shape are optimized.The results show that the optimum protection resistor is 500 kΩwhich can meet the role of protecting the DC voltage generator in the test circuit;The externally insulated length is selected to be 10 m,the resistance wire winding method uses two resistance wires for double-wire winding,The high-voltage terminal electrode is equipped with ring diameter 2700 mm,hood depth 500 mm and pipe diameter 250 mm of a grading ring on the high-voltage end,which can significantly improve voltage and electric field distribution on the resistor,and meet the requirement of no external insulation flashover and prevent flashover along the surface.

关 键 词：直流叠加冲击电压 保护电阻 仿真计算 电压分布 电场分布 

分 类 号：TM247[一般工业技术—材料科学与工程]