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Power distribution network fault positioning method and device based on transient wave recording type fault indicator

A fault indicator and distribution network fault technology, applied in fault location, fault detection by conductor type, measurement device, etc., can solve the problems of high sampling accuracy requirements, loss of real-time and sensitivity of fault location, etc. The judgment principle is simple, the fault location is stable and reliable, and the calculation amount is small.

Inactive Publication Date: 2020-04-10
NARI NANJING CONTROL SYST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After all the data is uploaded (it takes 10-30 minutes), the master station will perform positioning, which loses the real-time performance and sensitivity of fault positioning
Moreover, the timing accuracy of the above algorithm for the fault indicator needs to be within 3ms, which is relatively high, and the sampling accuracy is also very high.

Method used

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  • Power distribution network fault positioning method and device based on transient wave recording type fault indicator
  • Power distribution network fault positioning method and device based on transient wave recording type fault indicator
  • Power distribution network fault positioning method and device based on transient wave recording type fault indicator

Examples

Experimental program
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Effect test

Embodiment 1

[0066] This embodiment is a distribution network fault location method, including:

[0067] receiving fault recording files generated by fault indicators in response to distribution network faults;

[0068] Analyze the fault recording file to obtain the zero-sequence current waveform data;

[0069] Based on the zero-sequence current waveform data obtained by analysis, determine the time when the fault occurs;

[0070] According to the pre-built distribution network model, determine the branch lines connected to the busbar and the downstream fault indicators of each fault indicator on each branch line;

[0071] According to the number of branch lines connected to the busbar, and by comparing the similarity of zero-sequence current waveforms of the fault indicators on different branch lines connected to the busbar, the branch line where the fault is located is predicted;

[0072] For each branch line where the predicted fault is located, by comparing the similarity of the zero...

Embodiment 1-1

[0076] On the basis of embodiment 1, in the present embodiment:

[0077] The fault recording file is: at least one transient recording type fault indicator on the feeder belonging to the same busbar, in response to the grounding fault of the distribution network line, records the load current data of the three-phase line, and the generated comtrade format recording files. When the line is grounded, the fault indicator triggers the acquisition unit to record the load current data of the line by collecting the sudden value of the phase electric field strength in the line, and collects the wave recording data of the three-phase acquisition unit through the collection unit to synthesize zero sequence The current waveform is formed into a comtrade recording file and sent to the DTU power distribution terminal and / or power distribution master station.

[0078] For the fault recording files of multiple fault indicators triggered by the same fault, the determination of the fault occu...

Embodiment 1-2

[0110] This embodiment specifically describes the distribution network fault location method from the aspects of distribution network modeling, wave recording analysis, fault time determination, fault line selection, and fault location.

[0111] 1. Distribution Network Modeling

[0112] combine Figure 1 to Figure 3 , before the fault location of the distribution network, the simplified modeling of the distribution network is carried out first. The simplified modeling of the distribution network can be developed through the existing technology to configure the modeling software to realize the user-operated device control drag and line drawing interface, and then generate a simplified distribution network line topology according to the user's operation. If for figure 2 The distribution network line structure shown can be generated image 3 The tree topology diagram shown.

[0113] After the distribution network model is determined, each time a fault occurs in the distribut...

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Abstract

The invention discloses a power distribution network fault positioning method and device. The method comprises the steps of receiving a fault recording file generated by a fault indicator in responseto a power distribution network fault; analyzing to obtain zero-sequence current waveform data; determining a fault occurrence moment; determining a line topological structure according to a pre-constructed power distribution network model; according to the number of the branch lines connected with a bus and by comparing the zero-sequence current waveform similarity of the fault indicators on thedifferent branch lines connected with the bus, pre-judging the branch lines where the fault is located; for the branch line where each pre-judged fault is located, judging whether the fault exists ornot or judging the position of the fault by comparing the similarity of the zero-sequence current waveforms of the adjacent fault indicators on the branch line. According to the invention, fault positioning discrimination is carried out based on the waveform file of the transient wave recording type fault indicator in combination with the line topology, the fault positioning efficiency and reliability can be improved, and the requirement for the time synchronization precision of the fault indicators is not high.

Description

technical field [0001] The invention relates to the field of grid fault location in distribution automation technology, in particular to a fault location method and device for a distribution network based on a transient recorder type fault indicator. Background technique [0002] As the last link of the power transmission and distribution system, the degree of automation of the distribution network is closely related to the quality and reliability of power supply and consumption. The medium-voltage distribution network at home and abroad widely adopts the non-effective neutral point grounding operation mode, mainly including the neutral point non-grounding mode and the arc-suppression coil grounding mode. The structure of distribution network is complex, and faults occur frequently, especially single-phase grounding faults. After a single-phase ground fault (also known as a small current ground fault), the system can run with the fault for a period of time, and the instanta...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 刘遐龄周俊蔡月明刘明祥王文轩樊轶杨涛封士永陆凡张刘冬车凯
Owner NARI NANJING CONTROL SYST
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