风电场大地网接地阻抗测试个例分析

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。

A case study of grounding impedance test of wind farm earth network.

Geodetic network is the main component of wind farm, and it is an important work to carry out safety test on the ground network grounding impedance regularly. Dongyuan cicada subitems wind farms are introduced in this special geographical environment and the earth network installation, studied and analyzed the conditions and methods of the grounding impedance test requires, chose three pole method, the Angle of the different frequency method, the method of combining the grounding impedance test methods for practical analysis, and summarized in this paper, the error source and eliminate the error of the method and the matters needing attention, hoping for the same kind large ground network to provide technical reference grounding impedance test.