特高压换流站输电设备概述.pdf

研究与开发
特高压换流站输电设备概述
王烜(1)(2) 曹晓珑(1)
(西安交通大学电力设备电气绝缘国家重点实验室(1) 西安 710049
中国电力科学研究院(2) 北京 100085)

摘要研究表明,拟建中的 800kV 特高压换流站采用 12 脉动换流技术,换流单元有单极单换
流器与单极双换流器串联两种选择,其关键影响因素是换流变压器的容量。由于结构复杂,换流变
压器故障率是电力变压器的两倍,阀绕组与地以及交流绕组之间的主绝缘结构是特高压换流变压器
设计的难点。连接于极线的输电设备主要有平波电抗器、滤波电容器、直流电压分压器、光学电流
传感器、直流避雷器等。对于特高压而言,其最主要的问题是由于污秽引发外绝缘闪络以及由于电
压分布变化导致的内绝缘故障。
关键词:特高压换流站换流变压器电抗器电容器分压器避雷器
Summarize of UHVDC Station Transmit Electricity Equipments
WANG Xuan (1)(2) CAO Xiao-long (1)
((1) State Key Laboratory of Electrical Insulation for Power Equipment, Xi'an Jiaotong University,
Xi’an, 710049 (2) China Electric Power Research Institute, Beiking, . China 100085)

Abstract: It is shown 12-pulses technique will be used in the 800kV UHVDC stations under-plan.
There are two choices of converter unit connection between single converter and double converters in
series per pole. Capacity of converter transformers is one of important factors to decide this choice. Due
plex configuration, converter transformers failure rate is twice than power transformers. Main
insulation structure design has difficulty between valve windings and AC windings for UHV converter
transformers. The equipment which connected in the DC bus includes smoothing reactors, capacitors,
voltage dividers, optical current transducers and arresters. The most serious problem is