摘要
采用静电场有限元数值方法,对自主研发的±500 kV柔性直流换流阀的内绝缘和外绝缘特性进行了分析计算。按照子模块最大保护电压,校核换流阀的内绝缘特性;按照阀支架雷电冲击试验,校核换流阀的外绝缘特性。计算结果表明,自主化±500 kV柔性直流换流阀阀塔内部空气中最大电场强度为1.017 kV/mm,屏蔽系统最大电场强度为1.619 kV/mm,底部支撑绝缘子处最大电场强度为2.941 kV/mm。以3 kV/mm作为起晕场强判据,雷电冲击试验下,阀支架无起晕现象。试验结果表明,采用当前换流阀设计方案,换流阀顺利通过型式试验,无闪络、击穿放电现象,冷却系统无损坏。研究结果为±500 kV柔性直流输电系统换流阀绝缘设计提供了参考。
The electric field distribution characteristics of self-developed +500 kV VSC-HVDC converter is calculated with the finite element analysis method for electrostatic field in this paper. The internal insulation characteristics of valve is investigated based on the maximum protection voltage of sub-module, and the outer insulation char acteristics of valve is investigated based on the lightning impulse test of supporting structure. Calculation results show that the maximum electric field value of the self-developed ±500 kV converter tower is 1.017 kV/mm in the air gap of valve components, 1.619 kV/mm in the shielding system, 2.941 kV/mm around the supporting insulator. So if3 kV/mm is taken as the critical field intensity for corona inception of air, there will be no corona occurred on supporting struc ture during the lightning impulse test. Testing results show that the valve passes through experimental testing successfully without flashover, breakdown or discharge phenomenon with the current design, and there is no the cooling system. The conclusion provides a reference for the insulation design of ±500 kV VSC-HVDC valve. damage to converter
出处
《高压电器》
CAS
CSCD
北大核心
2017年第10期183-189,197,共8页
High Voltage Apparatus
基金
国家电网公司科技项目(5455ZS160020)~~
关键词
±500
kV柔性直流换流阀
有限元法
电场强度
绝缘特性
起晕
±500 kV VSC-HVDC converter valve
finite element method
electric field strength
insulation properties
corona inception