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Intermittent arcing ground-fault line selection method based on improved phase locked loop

A technology of arc grounding and fault line selection, applied in the direction of fault location, etc., to achieve the effect of fault line selection, accurate extraction, and accurate fault line selection

Inactive Publication Date: 2013-09-18
SHENYANG AGRI UNIV
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Problems solved by technology

If it is directly applied to the fault line selection system, it will definitely bring disadvantages to the real-time performance of line selection

Method used

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  • Intermittent arcing ground-fault line selection method based on improved phase locked loop
  • Intermittent arcing ground-fault line selection method based on improved phase locked loop
  • Intermittent arcing ground-fault line selection method based on improved phase locked loop

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Embodiment Construction

[0067] The specific implementation will be described below by taking the line selection process when an intermittent arc-to-ground fault occurs on the line 1 as an example.

[0068] 1. Use the visual simulation tool Simulink of the matrix laboratory software Matlab in the computer to build the simulation model:

[0069] (1) Build the basic model of 10.5KV distribution network

[0070] The basic model structure diagram is as follows figure 2 As shown, including three-phase AC power supply, transformer, arc suppression coil, transmission line, load, and current transformer, the parameters of each component are set as follows:

[0071] Three-phase AC power supply: Phase-to-phase rms voltage: 60e 3 ; Phase angle of phase A: 0; Frequency: 50Hz; Inter connection: Yg; Capacity (3-phase short-circuit level at base voltage): 500MVA; Base voltage: 60e 3 ; X / R ratio (X / R ratio): 0.0007. Such as image 3 shown.

[0072] Three-phase transformer 1: rated capacity and frequency (Nomi...

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Abstract

The invention relates to an intermittent arcing ground-fault line selection method based on an improved phase locked loop. The method is characterized in that a visual simulation tool Simulink of matrix laboratory software Mat lab in a computer is used for modeling a simulated model, steps, such as signal extraction, phase adjustment, amplitude adjustment, data processing and line selection, are carried out, and a line is in fault if the phase of harmonic current of the line is opposite to that of harmonic current of other lines and a data value, obtained after the harmonic current of the line is processed, is greater than or equal to the sum of data values obtained after the harmonic current of the other lines. The method has the positive effects that accurate extraction on the amplitude and phase information of five harmonic currents of a zero-sequence current after intermittent arcing ground fault is realized, and the accurate fault line selection is realized by virtue of fault characteristics of a power distribution network.

Description

technical field [0001] The invention belongs to a detection method for a single-phase ground fault detection of a distribution network, and in particular relates to a detection method for an intermittent arc ground fault of a distribution network combined with an improved phase-locked loop and a related line selection algorithm. Background technique [0002] The distribution network of our country is very extensive and complex, and the neutral point grounding method of the medium voltage distribution network is mainly non-effective grounding. In this system, single-phase-to-earth faults occur from time to time. Since the single-phase ground fault does not affect the continuous power supply to the load, this undoubtedly greatly improves the reliability of power supply. However, at this time, the phase voltage amplitude of the fault network increases to 1.732 times of the original, which poses a great threat to the insulation of the system. [0003] In order to prevent the f...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 张志霞朴在林刘晓
Owner SHENYANG AGRI UNIV
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