基于异频电流法的抽水蓄能电站接地阻抗测量实践

Grounding Impedance Measurement Practice in a Pumped Storage Power Station based on Different Frequency Current Method

接地电阻值作为电站接地系统的重要技术指标,对接地网的安全性评价具有重要意义。抽水蓄能电站因其特殊的地势条件和复杂的土壤结构,使其接地网阻抗的计算和测量较普通地网更复杂。通过分析异频电流法在实际测量中的优点,并结合长龙山抽水蓄能电站接地阻抗测量实践,提出了接地网设计以及测试中需要注意的几点建议,对抽水蓄能电站接地网阻抗研究与测量具有一定的参考意义。

As an important technical indicator for the grounding system in power plants,the grounding resistance value is of great significance for the safety evaluation of the grounding grid.Due to the special terrain conditions and the complex soil structures,calculation and measurement of the grounding grid impedance of pumped storage power stations are more difficult than ordinary grounding grids.With the analysis of the advantages of the different frequency current method in practical measurement,and the grounding impedance measurement practice in Changlongshan Pumped Storage Power Station,several suggestions for the design and tests of the grounding grid are proposed.It can be useful reference for the research and measurement of the grounding grid impedance in pumped storage power stations.