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Method Research of Single Phase Grounding Fault Location in Power Distribution Network

Author: SunRongWei
Tutor: CaiXu
School: Shanghai Jiaotong University
Course: High Voltage and Insulation Technology
Keywords: small current grounding single-phase grounding fault fault location parallel resistance node impedance matrix
CLC: TM862
Type: Master's thesis
Year: 2009
Downloads: 251
Quote: 0
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Abstract


Most of the low-medium power distribution networks in China adopt non-effectively grounded neutral mode, also called small current grounding mode. Fast and accurate fault location, especially for single-phase grounding fault location, has significant meaning not only in reducing the power failure area, shortening the blackout time, improving power supply reliability, but also in securing the operation of the whole power system and safeguarding the economic operations.This article introduces the latest research findings of single-phase grounding fault location in small current grounding systems and analyses the advantages and disadvantages of various fault location methods. Then the article gives the operation features of both systems of isolated neutral mode and neutral grounding via arc suppression coil mode, and also the working mechanism of the two modes when single-phase grounding fault occurs. Based on these researches and findings, the following passages of this article propose its own faulted section location and fault location methods.Power distribution network is different from long distance power transmission line, in which it has more branches, more complex topology, and shorter distance, so that it is much more demanding in accurate fault location. In view of these problems, this article takes two steps to achieve the fault location objective. It first finds out the faulted section, then using synchronized phase measurements and node impedance matrix to get the exact fault location.In faulted section location part, this article constructs a multi-section model of power distribution network, defines a section description matrix P, and proposes a faulted section location method based on zero sequence current differences, then designs a node incidence matrix C to store the topology information of the power distribution network, so matrix C and matrix P can be used in calculating zero sequence current differences. The faulted section location method compares the zero sequence current differences of all sections. The section with the largest current difference is the faulted section. Simulation results show that this method works well in all conditions.In fault location part, this article introduces a fault location method, which originally only used in large current grounding systems. Through a series of modifications, this method now works well in small current grounding systems. Matlab simulation results confirm the accuracy and reliability of this method. This fault location method may have certain practical application values.

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