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高压电器  2015 

哈密南―郑州±800 kV特高压直流输电工程接地极线路参数测量及分析

DOI: 10.13296/j.1001-1609.hva.2015.12.003, PP. 14-18

Keywords: 接地极线路,工频参数,频率特性参数

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Abstract:

哈密南―郑州±800kV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;47.5Hz和52.5Hz频率下实测阻抗值,经过加权平均计算后,与采用工频50Hz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。

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