A method and device for fault section location based on spectrum sequence kurtosis analysis

A technology of frequency spectrum sequence and fault section, which is applied in the direction of fault location, measuring device, fault detection according to conductor type, etc., and can solve problems such as difficulty in selecting center of gravity frequency

Active Publication Date: 2021-01-12
ZHUHAI XJ ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the shortcoming that the distribution network fault section location method based on the transient center of gravity frequency has difficulty in selecting the center of gravity frequency downstream of the fault point, and proposes the following scheme,

Method used

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  • A method and device for fault section location based on spectrum sequence kurtosis analysis
  • A method and device for fault section location based on spectrum sequence kurtosis analysis
  • A method and device for fault section location based on spectrum sequence kurtosis analysis

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Embodiment 1

[0071]Build a single-phase grounding simulation model of the distribution network in the ATP / EMTP environment,Figure 8 The 10kv distribution line shown is simulated and verified. Overhead line selects the JMarti model related to the frequency domain, and uses the subroutine Line Check of the simulation platform to calculate the line parameters at power frequency: positive sequence impedance Z1=0.3199+j0.2895Ω / km; positive sequence ground admittance b1=j3.584μs / km; zero sequence impedance Z0=0.4571+j1.8067Ω / km; zero sequence ground admittance b0=j1.3673μs / km. The equivalent load impedance of each line is unified as ZL=400+j20Ω. The length of the four feeders is L1= 15km, L2= 15km, L3= 20km, L1= 20km. The arc suppression coil is calculated by 10% over compensation, and the corresponding inductance value is L=9.42H. The complete set of distribution control terminals FTU1~FTU5 with measuring devices divide the feeder line into 5 sections.

[0072]Set the time of the A-phase grounding fault...

Embodiment 2

[0082]Use a certain electrical research institute to test the fault record data of each section switch to verify the algorithm proposed in this article.Picture 9 In order to use the zero sequence current waveform of each detection point after the fusion of the fault recorder analysis software, it can be seen from the figure that the transient process of the first channel is obviously different from the transient process of the other two channels. The frequency spectrum obtained by Fourier analysis in the frequency domain is as followsPicture 10As shown in the figure, it can be seen that the main frequency of the zero sequence current of the three fault monitoring points is 200Hz, so the method based on the transient center of gravity frequency will not be able to determine the fault section. After further analysis of the kurtosis of the spectrum sequence, the calculated kurtosis values ​​are K1=12.0, K2=9.25, K3=8.43, that is, the difference between K1 and K2 is the largest, that is...

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Abstract

The invention provides a method and device for analyzing fault segment location based on spectral sequence kurtosis. The method and device are mainly used for the auxiliary judgment of a fault segmentwhen a single-phase grounding fault occurs on a power distribution system. The transient gravity center frequency of the upstream zero-sequence current of a fault point is obvious, and is approximateto the shape of a single impact by means of spectrum analysis, and the downstream zero-sequence current of the fault point has a certain amplitude at a plurality of resonant frequencies, and is approximate to the shape of multi impacts, and therefore, spectrograms at two sides of the fault point are significantly different; with the maximum value of the zero-sequence current Fourier spectrum analysis sequence of monitoring points adopted as input signals for kurtosis calculation, a fault segment can be determined by means of the maximum value of the kurtosis difference value of various segments when the transient gravity center frequency is not obvious, and the maximum value can be used as an effective auxiliary judgment basis.

Description

Technical field[0001]The present invention relates to the technical field of circuit protection, and in particular to a method and device for locating a fault section based on spectral sequence kurtosis analysis.Background technique[0002]As the power distribution link that has the closest relationship with users, the reliability of the distribution network directly affects the overall performance and efficiency of the power system and the quality of users' power supply. With the complexity of the power distribution system network structure and the diversification of power supply operation modes, the difficulty of control operations and accident handling has increased. Therefore, the distribution automation system that can realize the rapid location and isolation of the line fault section and the remote automatic operation and processing of the fault has been widely used.[0003]At present, there are many researches on the fault line selection and location method of distribution networ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 罗勋华陈奎阳郭上华李贞胡兵彭松李丹祥林华梁
Owner ZHUHAI XJ ELECTRIC
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