A single-phase-to-ground fault section location method in distribution network based on cosine similarity
A single-phase-to-ground fault and cosine similarity technology, applied in the fault location, detecting faults according to conductor types, measuring electricity and other directions, can solve the problems of the correctness of the positioning method of the affected section and the complex structure of the voltage distribution line, and achieve accurate Highly responsive and adaptable effects
Inactive Publication Date: 2022-06-24
国网湖北省电力有限公司恩施供电公司
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However, the structure of the on-site medium-voltage distribution line is complex. At the line nodes with branches, the characteristics of the zero-sequence current collected before and after the branch point will change greatly, which seriously affects the traditional transient zero-sequence current based on uploading. The Correctness of Segment Locating Method Based on Sequence Current Feature Similarity Alignment
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[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0021] In order to improve the correctness of the traditional single-phase grounding fault location method in the distribution network, a new method is proposed in this embodiment. First, a digital simulation model of the actual distribution network is established; fault, obtain the transient zero-sequence current waveform data at the positions of the acquisition devices along the medium-voltage distribution line, and store these waveform data as standard data; once a single-phase grounding fault occurs in the medium-voltage distribution line, use the cosine The similarity calculates the similarity between the transient zero-sequence current waveform collected at each location and the pre-obtained standard waveform; Achieve accurate fault location. This method is not affected by branch lines, and is not affected by overhead mixed lines of cables.
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The present invention relates to non-effectively grounded distribution network technology, in particular to a cosine similarity-based positioning method for a single-phase ground fault section in a distribution network, including establishing an electromagnetic transient digital simulation model of a medium-voltage distribution network to be located, Including the main transformer model of the 110kV substation, the medium voltage distribution line model, the distribution transformer model and the load model; set a single-phase ground fault at the busbar of the medium voltage distribution line in the substation, and obtain the standard waveform data at each sampling point; when the actual distribution When a single-phase ground fault occurs in the power grid, the actual fault transient zero-sequence current is obtained by sampling at each collection point on site; based on the cosine similarity, the similarity between the actual fault transient zero-sequence current data and the standard waveform data is calculated; two The similarity difference between the fault transient zero-sequence currents of adjacent sampling points can be used to determine whether a single-phase ground fault occurs between two adjacent sampling points or a single-phase ground fault occurs on the bus. This method is not affected by branch lines, and is not affected by cable overhead hybrid lines.
Description
technical field [0001] The invention belongs to the technical field of non-effectively grounded distribution networks, in particular to a method for locating a single-phase grounding fault section of a distribution network based on cosine similarity. Background technique [0002] Existing methods for locating single-phase-to-ground faults in non-effectively grounded distribution networks can be roughly divided into two categories according to the different information they use: one is the method of locating faults based on externally injected signals; the other is the use of single-phase grounding faults. It can be further divided into fault location method based on fault steady state component, fault location method based on fault transient component and comprehensive location method. According to the actual application experience in the field, the segment location method based on the uploaded transient zero-sequence current feature similarity comparison is the most widely ...
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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088
Inventor 袁中祥朱占春潘宗俊冉荣华周海闻生学牟华杨华林邓丛中张新宇唐金锐袁成清
Owner 国网湖北省电力有限公司恩施供电公司