Grounding resistance measurement method of largegrounding grids with short current wire |
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作者姓名: | LIU Yu gen YU Xiao dong SONG Zi nan SU Yu ping and Tian Jin hu |
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作者单位: | State Key Laboratory of Power Transmission Equipment & System Security and NewTechnology,Chongqing University,Chongqing 400030,P.R.China;;State Key Laboratory of Power Transmission Equipment & System Security and NewTechnology,Chongqing University,Chongqing 400030,P.R.China;;Anshun Power of Guizhou Grid Corporation,Guizhou Anshun 561000,P.R. China;State Key Laboratory of Power Transmission Equipment & System Security and NewTechnology,Chongqing University,Chongqing 400030,P.R.China;;State Key Laboratory of Power Transmission Equipment & System Security and NewTechnology,Chongqing University,Chongqing 400030,P.R.China; |
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摘 要: | The 0.618 method for grounding resistance measurement has long wire lead defect. By calculating and analyzing the ground potential of a large number of grounding grids which are different in shape, area and rod arrangement style using computer numerical method, it presents that the grounding grids can be equivalent to disc shape grounding electrodes. A new method of grounding resistance measurement is presented that taking the current electrode wire as long as the longer side length of grounding grids and voltage electrode wire as 0.509 times long as the current electrode wire. The measurement accuracy of this method is testified by experiment in field. The proposed method has much shorter wire than 0.618 method, it is suited to grounding resistance measurement of large grounding grids.
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关 键 词: | grounding grid grounding resistance measurements numerical method |
收稿时间: | 2009/6/28 0:00:00 |
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