基于微分法的接地网拓扑结构检测

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Abstract The magnetic inverse problem method is often used to diagnose the topology and corrosion broken of the grounding grids in existing research, but the solution process is usually very complex. This paper proposes a derivative method which can draw the topology of ground grids by injecting current into the ground grids, filtering and numerical differentiation for magnetic field of the surface. First, a shape function is introduced to describe the distribution of magnetic field which is parallel to the surface of grounding grids, after analyzing the principle of derivative method. Since its even-order derivatives contain main peaks, the 2nd- and 4th-order derivatives are chosen to detect the topology of grounding grids, and numerical example shows that the 2nd- and 4th-order derivative method can accurately diagnose the topology of current-carrying grids. Experimental result shows that the 2nd- order derivative method is recommended to use in practical application, while the 4th-order derivative method requires high accuracy measurement data. Thus, the derivative method can detect the position of grid branch in the measurement area, and hereby draw the topology of grounding grids with low error and less computation.

Key words： Grounding grids derivative method topology magnetic field

Received: 05 April 2013 Published: 13 April 2015

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	Articles by authors
	Wang Xiaoyu
	He Wei
	Yang Fan
	Zhu Liwei
	Liu Xingping

Cite this article:

Wang Xiaoyu,He Wei,Yang Fan等. Topology Detection of Grounding Grids Based on Derivative Method[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 73-78.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I3/73

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