±1000kV特高压直流互感器的选型与研制

Development on±1000kV UHVDC instrument transformer

直流输电作为一项成熟、可靠的大容量、远距离输电技术,在我国跨省、区联网工程中发挥了重要作用。随着±800kV特高压直流输电工程的顺利开展和实施,更高电压等级±1000kV特高压直流输电技术的发展成为可能。直流互感器是供直流输电系统用电能计量、电量监测、电力系统控制与保护的重要装置,由于直流互感器的技术比交流互感器复杂,制造难度大,国内用量少,且事故率很高,所以一直没有得到推广,云南-广东和向家坝-上海±800kV特高压直流工程中直流互感器均依赖于进口,我国未掌握核心技术。为推进特高压直流设备国产化进程,±1000kV直流电压等级的直流互感器研究成为必然。在对比分析目前直流互感器的类型,同时又参照±800kV直流工程中直流互感器运行情况的基础上,对于±1000kV直流互感器进行了选型、结构、性能及关键技术等方面的研究。分析结果对研制±1000kV特高压直流互感器具有指导作用。

DC transmission is very important in long distance power transmission in China because of its safety and reliability.As long as±800kV HVDC transmission project has been built,±1000kV ultra HVDC transmission becomes possible.DC instrument transformer is important of value source and relay protection in power measurement.Because DC instrument transformer is more difficult than AC in manufacture and it is not safe,so it is not popular in the world and China.±800kV HVDC instrument transformer is lied in Yun nan-Guang Dong and Xiang jiaba-Shang hai projects.To develop homemade UHVDC devices,it is very important to research±1000 kV UHVDC instrument transformer.Through comparing and analyzing±800kV UHVDC instrument transformer,we have researched the section,configuration,performance and other key technology of±1000kV UHVDC instrument transformer in detail,so as to hold key technology and economize project financing.