配电线路自然接地体冲击试验研究

Study on Impulse Experiment of NaturalGrounding Electrode of Distribution Line

通过搭建真型试验场地,对配电线路杆塔自然接地体的冲击特性进行了试验研究。不同激励强度下的杆塔表面与冲击侵入点的空间暂态电位差和地电位分布试验结果表明,杆塔表面电位与侵入点电位相比,下降约20%~35%;随着测点与杆塔自然接地体间距的增加,地表电位迅速下降,且下降速度随着距离的增加迅速放缓;自然接地体的冲击接地阻抗随着冲击电流幅值的增大而下降迅速。

By setting up a real test place,the impact characteristics of the natural grounding body of the power distribution line tower were tested and studied.The test results of the spatial transient potential difference and ground potential distribution between the tower surface and the impact intrusion point under different excitation intensities show that the surface potential of the tower is reduced by about 20%~35%compared with the intrusion point potential.As the distance between the measuring point and the natural grounding body of the tower increases,the surface potential drops rapidly,and the descending speed slows down rapidly as the distance increases.The impulse ground impedance of the natural grounding body decreases rapidly with the increase of the impulse current amplitude.