• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2016, Vol. 37 ›› Issue (4): 70-75.doi: 10.3969/j.issn.1000-7229.2016.04.011

• 输配电技术 • 上一篇    下一篇

避雷线分流对杆塔接地电阻测量的影响

张博成,胡志坚,张凯军   

  1. 武汉大学电气工程学院,武汉市 430072
  • 出版日期:2016-04-01
  • 作者简介:张博成(1991),男,工学硕士,主要从事输电线路带电测量、电力系统接地等方面的研究工作; 胡志坚(1969),男,博士、教授、博士研究生导师,研究方向为电力系统稳定分析与控制、新能源接入与分布式发电、输电线路参数带电测量等。

Influence of Ground Wire Shunting on Tower Grounding Resistance Measurement

ZHANG Bocheng,HU Zhijian,ZHANG Kaijun   

  1. School of Electrical Engineering, Wuhan University, Wuhan 430072, China
  • Online:2016-04-01

摘要:

采用电流-电压三极法测量架空线路杆塔的工频接地电阻时,架空避雷线对注入杆塔地网的测量电流具有分流作用,从而影响接地电阻的测量精度。建立了架空避雷线对注入杆塔地网的测量电流的分流模型,分析了避雷线分流的程度和影响分流效果的因素及其影响规律。结果表明:(1)避雷线分流所占比重可以达到60%以上,当测量杆塔接地电阻较大、非测量杆塔接地电阻较小、测量杆塔为变电站出线上的前2座杆塔时,避雷线分流效果更明显;(2)仅考虑分流电流大小对杆塔接地电阻测量的影响是不够的,忽略分流电流与测量电流的相角差同样会造成较大的测量误差,导致接地电阻的测量值偏高。

关键词: 杆塔, 接地电阻, 架空避雷线, 分流, 相角差

Abstract:

When using the method of current-voltage three-electrode method to measure the power frequency grounding resistance of overhead line tower, the ground wire has a role in separating the measuring current into the tower grounding grid, which can affect the measurement accuracy of grounding resistance. This paper establishes a shunting model of measuring current into the tower grounding grid for overhead ground wire, and analyzes the degree of the ground wire shunting, the factors affecting the shunting effect and its influence law. The results show that: (1)the share of the ground wire shunting can reach more than 60%; the effect of shunting is more obvious when the grounding resistance of the measurement tower is greater, the grounding resistance of the non-measurement tower is smaller and the measurement tower is the first two tower from the substation; (2)only considering the effect of shunt size on grounding resistance measurement is not enough, ignoring the phase angle difference between the ground wire shunting and the measuring current can also cause big errors, which will make the measuring value of the grounding resistance higher.

Key words: tower, grounding resistance, overhead ground wire, shunt, phase angle difference

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