异频法测试大型地网接地电阻技术的研究

Research on testing large-scale grounding resistance of ground grid technique with different-frequency method

针对用工频大电流法和三极法测量大型地网接地电阻时抗干扰能力不足,介绍了异频法测量接地电阻的原理、测试频率的选择方法及测试仪器的参数,结合测试实例,验证了异频法的有效性,并分析了测试频率和测试引线布线方式对测试结果的影响,以期解决地网干扰电流等问题。

Aiming at the insufficient anti-interference ability of the power frequency large-current method and the three-pole method to test the large-scale grounding resistance of ground grid,the paper introduces the principle for the different-frequency method to test the ground resistance,the selective methods for testing frequency,and the parameter of the testing apparatus,proves the effectiveness of the different-frequency method by combining with the test examples,and analyzes the influence of the test frequency and the test pins and wires on the test results,so as to solve the ground interference current and other problems.