Low voltage power distribution line line breaking fault identification method and low voltage power distribution line line breaking fault identification device

A disconnection fault and line technology, which is applied in circuit devices, emergency protection circuit devices, fault locations, etc., can solve the problems of disconnection fault detection and fault type identification without providing solutions.

Active Publication Date: 2017-08-01
CHINA AGRI UNIV
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Problems solved by technology

[0004] Although the existing technology solves the problem of disconnection fault detection in 10KV distribution lines, it does not provi

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  • Low voltage power distribution line line breaking fault identification method and low voltage power distribution line line breaking fault identification device
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  • Low voltage power distribution line line breaking fault identification method and low voltage power distribution line line breaking fault identification device

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Embodiment Construction

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] In one embodiment of the present invention, refer tofigure 1 , a low-voltage distribution line disconnection fault identification method, comprising:

[0028] S101. Obtain the phase line current signal at the first preset sampling point on the single-phase branch, the total leakage current signal and / or the total leakage current signal at the second preset sampli...

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Abstract

The invention provides a low voltage power distribution line line breaking fault identification method and a low voltage power distribution line line breaking fault identification device. Fourier transform of a phase line current signal and a total leakage current signal of a first preset sampling point and Fourier transform of a total leakage current signal, an A phase current signal, a B phase current signal, and a C phase current signal of a second preset sampling point are carried out to acquire the amplitudes and the phase angles of the above mentioned various signals, and based on the amplitude, the phase angles, and the current setting values of the above mentioned various signals, whether a single-phase branch protection criterion and/or a three-phase main branch protection criterion are/is satisfied is determined. By combining the 220V single-phase branch protection criterion and the 380V three-phase main branch protection criterion together, a complete fault detection and protection system is provided for low voltage power distribution system line breaking faults, and faults of a three-phase power distribution wire main branch and faults of a single-phase branch power distribution wire are identified accurately, and therefore whether a protection device is required to cut the faulted line is determined.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of power distribution lines, and more specifically, to a method and device for identifying disconnection faults of low-voltage power distribution lines. Background technique [0002] Generally speaking, the distribution network refers to the power network with a voltage level of 35kV and below, and its function is to supply power to various distribution stations and various electric loads in the city. At present, the power distribution lines in most cities in my country use 10kV voltage level to supply power to users. Distribution lines have a wide distribution area and a long total length, but the operating environment is harsh, and they are prone to disconnection faults due to lightning strikes, external mechanical forces, and line load overloads, which seriously threaten the safety and reliability of power supply. After a disconnection fault occurs in the line, the voltage quality of t...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/08H02H7/26H02H1/00
CPCG01R31/085G01R31/50H02H1/0007H02H7/26
Inventor 杜松怀刘睿江伟强韩晓慧
Owner CHINA AGRI UNIV
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