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Power distribution network grounding fault detection positioning method

A technology of ground fault and positioning method, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve problems such as misjudgment of polarity and small value of current transient components, so as to improve detection rate and automation. Level, improve the effect of automation functions

Active Publication Date: 2017-07-28
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

However, when the fault occurs near the zero-crossing value of the phase voltage, the transient component value of the current is small, which may easily cause polarity misjudgment

Method used

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  • Power distribution network grounding fault detection positioning method
  • Power distribution network grounding fault detection positioning method
  • Power distribution network grounding fault detection positioning method

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Embodiment Construction

[0043] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] This application is attached figure 2 The distribution system diagram shown is an example to introduce the wavelet characteristic energy method for detection of distribution network ground faults. figure 2 As a power distribution system, the bus connected to the transformer is the power supply bus, on a feeder with the 1# pole as the outgoing line (feeder: it is the distribution line distributed by the power bus, and each feeder is composed of several distribution lines In this calculation example, a total of 4 sets of fault detection devices are installed, and the fault detection devices record and send the zero-sequence current recording data of the branch to the distribution network center.

[0045] 1) Install 3 sets of fault test branches, which are respectively located on pole 5, pole 11, and p...

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Abstract

A characteristic energy method of the power distribution network grounding real-time fault detection is characterized by selecting a Daubechies8 wavelet filter to carry out the 4-order wavelet decomposition on a power distribution network fault recording zero sequence current time series; taking the integrated square of the fourth-layer wavelet decomposition coefficients as the characteristic energy of the fault monitoring, and determining whether a power distribution network grounding fault occurs according to the energy characteristic value of a zero sequence current; when the grounding fault occurs, searching a monitoring point having the largest characteristic energy in the feeder line branches as the fault starting point, and along with the flow-out bus directions of the power flow of the branches, searching a monitoring point having the smallest adjacent characteristic energy as the fault tail, thereby determining that a power distribution network grounding fault section is between the above head and tail end points.

Description

technical field [0001] The invention belongs to the technical field of power distribution automation, and relates to a wavelet characteristic energy method for detection of grounding faults in distribution networks. Wavelet transformation is performed on recorded wave signal data at fault monitoring points, and the detail coefficients of the fourth layer after wavelet transformation are used as the basis. Data, the square integral of the detail coefficient is used as the characteristic energy value, and the ground fault is identified and the fault interval is determined through the characteristic energy. Background technique [0002] Most of the distribution networks in my country adopt the neutral point not directly grounded system (NUGS), that is, the small current grounding system, which includes the neutral point ungrounded system (NUS), the neutral point through the arc suppression coil grounding system (NES, also Called the resonant grounding system), the neutral point ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086
Inventor 齐文斌赵玉赵凤青谭志海周年光刘定国朱吉然
Owner BEIJING SIFANG JIBAO AUTOMATION
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