Calculation method for surface potential distribution of substation grounding grid considering multiple metal pipes
A technology of substation grounding grid and metal pipeline, which is applied in the field of calculation of substation grounding grid surface potential distribution, can solve the problems that it is difficult to reflect the actual situation of substation grounding grid surface potential distribution, so as to reduce the amount of calculation, improve accuracy, and improve overall sexual effect
Active Publication Date: 2020-03-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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In addition, when analyzing the on-site test results of the substation grounding grid, it is considered that the test results are only related to the state of the grounding grid and the soil structure, ignoring the influence of the substation’s underground metal pipes on the surface potential, which makes it difficult to obtain relevant test results. Reflect the actual situation of the substation grounding grid surface potential distribution
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[0053]The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0054] Such as figure 1 As shown, this embodiment provides a method for calculating the surface potential distribution of the substation grounding grid considering multiple metal pipes, including the following steps:
[0055] 1) Obtain the injection current i of the ground grid set ;
[0056] 2) Taking the grounding grid as an equivalent body, establish the potential relationship expression between the grounding grid and multiple pipelines:
[0057]
[0058] Where: R 00 is the resistivity matrix of the grounding grid itself; U 0 ,U A ,U B ,...,U K is the potential of the gro...
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The invention relates to a substation grounding grid ground potential distribution calculation method considering multiple metal pipes. The method takes into account mutual influence of longitudinal resistance of a number of metal pipes, the stray current of the pipes and the diffusion of a grounding grid, and calculates and analyzes the ground potential distribution of the grounding grid to acquire the comprehensive and accurate result of the ground potential distribution of the grounding grid of a substation. Compared with the prior art, the method provided by the invention has the advantages that the calculation accuracy of the ground potential distribution of the grounding grid of the substation is improved, and the calculation amount is reduced.
Description
technical field [0001] The invention relates to the technical field of substation grounding grids, in particular to a method for calculating the surface potential distribution of substation grounding grids considering multiple metal pipes. Background technique [0002] The grounding grid is an important part of the substation, and its reliability is of great significance to the safe and stable operation of the power system. In order to ensure the safe and reliable operation of the grounding grid, how to accurately and effectively discover the potential faults of the grounding grid and then take targeted protective measures has become the most prominent problem in the operation and maintenance of the power industry. The grounding grid fault diagnosis method based on the surface potential distribution is one of the most widely used methods at present. However, the site environment of the substation is relatively complex, and the existence of underground metal pipes will affec...
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IPC IPC(8): G01R31/08G06F30/20G06F17/16
CPCG01R31/086G06F17/16G06F30/20Y02E60/00
Inventor 施会王丰华盛连军茅晓亮周超杰朱李超黄建勇孟琦斌吕佩佩吴顺超
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO