风电场大地网接地阻抗测试个例分析

Case analysis of ground impedance test of wind farm earth network

大地网是风电场的主要组成部分,对地网接地阻抗这项性能参数定期的开展安全测试是风电场安全保障的重要工作。该文介绍了东源蝉子顶风电场特殊的地理环境和大地网的敷设方式,研究分析了接地阻抗测试需要具备的条件和方法,并选择四极法、异频法、夹角法、补偿法等相结合的接地阻抗测试方法进行实践分析。通过实践得出,实验采用的方法是可行的,且大型地网接地阻抗测试接地极布线采用0. 618测试方法、30°夹角测试法是科学的。归纳阐述了误差来源及消除误差的方法和注意事项,希望给予风电场大地网接地阻抗测试提供技术参考。

The geodetic network is the main component of the wind farm. It is an important task to ensure the safety of the wind farm by regularly conducting safety tests on the ground impedance of the grounding grid. This paper introduced the special geographical environment of wind farm of Dongyuan Ziziding and the laying method of geodetic network. This research studied and analyzed the conditions and methods needed for ground impedance test,and chose four-pole method,different frequency method,angle method and compensation method,and combined with ground impedance test method for practical analysis. Through practice,the method adopted in the experiment is feasible,and the grounding impedance test of the large grounding grid,which is based on the 0. 618 test method and the 30° angle test method is scientific. This paper also summarized the sources of error and the methods for eliminating errors and its precautions,wishing to provide a technical reference for ground impedance test of wind farms.