哈密南—郑州±800kV特高压直流输电工程接地极线路参数测量及分析  

Parameters Measurement and Analysis of the Grounding Lines for Southern Hami-Zhengzhou ±800 kV UHVDC Transmission Project

作　　者：刘博[1] 张博[1] 庞锴[1] 马德英[1] 邵颖彪 

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《高压电器》2015年第12期14-18,共5页High Voltage Apparatus

摘　　要：哈密南—郑州±800 kV换流站—陈家接地极线路在投运前需要测量工频参数和频率特性参数,为系统潮流计算和继电保护整定提供依据。根据接地极线路运行方式及对应实测参数值:双极运行下,测得的交流电阻值略大于直流电阻值;47.5 Hz和52.5 Hz频率下实测阻抗值,经过加权平均计算后,与采用工频50 Hz实测阻抗值很接近;双极运行下,零序电阻实测值频率特性随着频率的升高呈上升趋势,这是因为集肤效应的影响;零序电感实测值频率特性随着频率的升高呈下降趋势,这是由于大地电导随频率增加而增加的缘故;零序电容实测值随着频率的变化不大,通过EMTP进行仿真,验证了上述实测结论规律的一致性。The power frequency parameters and frequency characteristic parameters of the Chenjia grounding lines of Southern Hami-Zhengzhou ±800 kV Converter are measured before the grounding lines are put into operation in order to provide a basis for calculating system stability and setting relay protection. According to the operation mode of the grounding lines, conclusions are drawn as follows： 1 Considering the skin effect, the measured AC resistance value for bipolar operation is slightly larger than the DC resistance value; 2For the impedance frequency characteristic of 47.5 and 52.5 Hz, the power frequency parameters are calculated by the weighted average method, and the results are very close to the frequency of 50 Hz measured imdepance values; 3 The frequency characteristics of zero sequence resistance rises with the increase in frequency due to the skin effect; 4The zero sequence inductance decreases slightly with the increase in frequency because the conductivity of the earth increases with ascending frequency; and 5The zero sequence capacitance keeps steady with frequency, and EMTP simulation verifies the trend.

关 键 词：接地极线路 工频参数 频率特性参数 

分 类 号：TM721.1[电气工程—电力系统及自动化]