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Power transmission line single-phase grounding fault positioning method and system thereof

A technology for single-phase ground faults and power distribution lines, which is applied to fault locations, information technology support systems, and fault detection according to conductor types. It can solve problems such as low positioning accuracy and weak detection volume, and achieve the effect of eliminating hidden dangers.

Inactive Publication Date: 2019-02-26
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a single-phase ground fault location method and system for distribution lines to solve the problem of low positioning accuracy due to weak detection quantities in existing single-phase ground fault location methods

Method used

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  • Power transmission line single-phase grounding fault positioning method and system thereof
  • Power transmission line single-phase grounding fault positioning method and system thereof
  • Power transmission line single-phase grounding fault positioning method and system thereof

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Embodiment Construction

[0056] In order to solve the problem of low positioning accuracy due to the weak quantity to be detected in the existing single-phase ground fault location method, the present application provides a distribution line single-phase ground fault location method and system.

[0057] refer to figure 1 As shown in the work flow chart, the embodiment of the present application provides a method for locating a single-phase ground fault of a distribution line. The method is applied to a single-phase ground fault locating system for a distribution line. The system includes: a detection terminal and a host computer, The detection terminal communicates with the host computer through the GSM network, and the detection terminal is used to detect whether a single-phase ground fault occurs in the power distribution line. If a single-phase ground fault occurs, the detection terminal will detect the fault of the single-phase ground fault The data is transmitted to the host computer, and the hos...

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Abstract

The invention provides a power transmission line single-phase grounding fault positioning method and a system thereof, wherein the method comprises the steps of acquiring a voltage signal of three-phase power on the power transmission line by a detecting terminal, performing phase-mode transformation on the voltage signal, and obtaining zero-mode voltage; on the condition that the zero-mode voltage is not equal with a first preset threshold, transmitting the zero-mode voltage to an upper computer; if the zero-mode voltage is higher than a second preset threshold and gradient of a traveling wave front which corresponds with the zero-mode voltage is higher than a third preset threshold, calculating a distance between a fault point and the detecting terminal by the upper computer by means ofa travelling wave attenuation method; and determining the position of the single-phase grounding fault according to the distance between the fault point and the detecting terminal. According to the method of the invention, the position of the single-phase ground fault is fixed by means of a zero-mode voltage traveling wave attenuation characteristic; easy identification and relatively high precision of the zero-mode voltage travelling wave front are realized; the fault position can be quickly found for eliminating a hidden trouble; and a problem of low positioning precision caused by relatively weak to-be-detected amount in a traditional positioning method is settled.

Description

technical field [0001] The present application relates to the technical field of single-phase ground fault location of distribution lines, in particular to a single-phase ground fault location method and system of distribution lines. Background technique [0002] my country's medium-voltage distribution network plays an important role in distributing electric energy in the power network. The medium-voltage distribution network is composed of distribution lines, towers, distribution transformers, isolating switches, reactive power compensators and some auxiliary facilities. Among them, Distribution lines are mainly overhead lines. Because overhead lines are prone to ground faults, the reliability of power distribution in the distribution network is reduced. [0003] Among various types of ground faults, single-phase ground faults are more common. In order to increase the reliability of power distribution in the distribution network, it is necessary to locate the location of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/086G01R31/088G01R31/50Y04S10/52
Inventor 刘红文徐雨王科杨庆聂鼎杨金东
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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