摘要
为了确定±800kV特高压直流线路的绝缘水平,依托±800kV云广直流输电工程,采用PSCAD程序模拟计算了单极线路接地在健全极线路产生的缓波前过电压及其沿线分布,给出了2%过电压的计算方法,分析了直流滤波器电容、接地电阻大小和接地位置等因素对过电压波形和幅值的影响。按两种直流滤波器方案,进行了云广直流线路的绝缘配合,选择了线路杆塔最小空气间隙,研究结果已在云广直流输电工程建设中应用。采用V串的特高压直流线路杆塔空气间隙受缓波前过电压控制,建议可以按离线路中点±30km内、外两部分分别进行直流线路缓波前过电压绝缘配合,以节省投资。
In order to determine the insulation level of 800 kV UHV DC transmission line, the PSCAD program is used to simulate and calculate slow-front overvoltage（SFO） and distribution along line at healthy line pole caused by one line pole ground fault for the Yunnan to Guangdong 800 kV UHV DC transmlssion line. The methods to calculate 2 % SFO is given , the factors to influnce the waveforms and amplitude of SFO by capacitor value of DC filter, ground resistance value and location of fault is analysed. The insulation coordination of the Yunnan to Guangdong 800 kV UHV DC transmission line is performed and the minimum air clearance of transmission tower is selected according tO two DC harmonic filter construction schemes. The research results are used by the Yunnan to Guangdong 800 kV UHV DC transmission project. It is suggested that the insulation coordination of UHV DC transmission line can be derided into two line sections separately to carry out, since the air clearance of UHV DC transmission line tower with V type insulator string is controlled by SFO. One section is within and another section is out side of 30 km range near the midpoint of DC line.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第7期1509-1517,共9页
High Voltage Engineering
基金
国家"十一五"科技支撑计划"特高压输变电系统开发与示范"项目课题18(2006BAA02A18-1-B)~~
关键词
±800
kV直流线路
接地故障
缓波前过电压
健全极2%过电压
绝缘配合
空气间隙
±800 kV UHV DC transmission line
ground fault
slow-front overvoltage
healthy pole 2%overvoltage
insulation coordination
air clearance
