杆塔的冲击接地特性现场试验研究

Research on Onsite Test of Lightning Impulse Grounding Connection Characteristics on Tower

为研究输电线路杆塔接地装置的冲击特性,获得真型杆塔接地装置的冲击试验数据,采用便携式的冲击电流发生器对现场还未挂线的杆塔进行试验,获取杆塔自然接地、人工接地以及两者组合接地方式下电气性的冲击特性随冲击电流峰值变化的曲线。结果表明,冲击接地电阻随冲击电流幅值变大而减小;自然接地装置在实际工程应用中对降低冲击接地电阻起到了很大的作用,为进一步研究取消人工接地装置提供了有效的试验数据。

In order to study on the lightning impulse characteristics of grounding devices and to obtain their test data, the portable impulse current generator was adopted to carry out tests on the no hanging line tower on site and to obtain the curves of the impulse characteristic which changed with impulse current peak value under the mode of tower natural grounding, manual grounding and the combination of both kinds of grounding. The results show that the impulse grounding resistance decreases with the increase of impulse current amplitude. The natural grounding device plays an important role in practical engineering application to reduce impulse grounding resistance, which provides effective test data for further study of the artificial grounding device cancel.