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The Potential Calculation and Fault Diagnosis of Grounding Grid in Transformer Substation

Author: XuLan
Tutor: ZhangDanDan
School: Huazhong University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Grounding grid Surface potential Fault diagnosis Grey incidence analysis theory
CLC: TM862
Type: Master's thesis
Year: 2011
Downloads: 78
Quote: 1
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Abstract


The condition of the substation grounding grid is vital for the safety of the power systems. During the condition monitoring of substation grounding grid, the parameter calculation of grounding grid and its fault diagnosis are very important and practical. In this paper, based on theoretical analysis, the model of the grounding grid is established, which can calculate the potential of the grounding grid. A diagnosis method which is based on analyzing the surface potential distribution is proposed. Through research of grey incidence analysis theory, a new diagnosis method which is based on T’s correlation degree is suggested.Through analyzing the distribution of current and potential in the soil, a model is established, which is based on EMF-circuit theory. Superposition method is used in the model. At the same time, subdivision and equivalent are adopted to Simplify the calculation. Comparing with CDEGS, the accuracy of the calculation program of this paper is Proved.Based on theory of electrostatic field, the current and potential distribution of the conductor are analyzed, and the diagnosis method which is depending on the surface potential distribution is suggested. By the program carried through in this paper, calculation on fine and break grounding grid is completed. In addition, simulation experiment is carried out,which get the potential parameter of the fine and broken grounding grid to get.The results of calculation and experiment show that the surface potential will get down when the breakdown occurs on the grounding grid. Therefore, the Surface potential distribution can be used as a key factor to determine fault of grounding grid.Finally, based on the grey incidence analysis theory, the diagnosis model which is based on T’s correlation degree is suggested. The potential is greatly affected by the distance of the potential point and the border of the grounding grid. To weaken the effect, a self-defined "edge factor" is applied in the diagnosis model. Two examples are calculated by the model. The result shows that the model is effective, which is not need to know the structure of the grounding grid.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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