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Power grid fault location method and system

A technology of power grid fault and location method, applied in fault location, fault detection according to conductor type, measurement of electricity, etc., can solve the problems of low power grid fault maintenance efficiency, high maintenance cost, manual inspection, etc., to reduce inspection and troubleshooting time. , The effect of high maintenance efficiency and timely maintenance

Inactive Publication Date: 2017-09-15
JILIN UNIV
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Problems solved by technology

[0003] In view of this, the present invention provides a power grid fault location method and a positioning system to solve the problems that the existing power grid fault location method requires manual investigation, high maintenance cost, and low power grid fault maintenance efficiency.

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  • Power grid fault location method and system
  • Power grid fault location method and system

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Embodiment Construction

[0021] The present invention will be further explained below in conjunction with specific embodiments, but the present invention is not limited thereto.

[0022] Such as figure 1 As shown, the present invention provides a grid fault location method, comprising the following steps:

[0023] (1) Set monitoring points at intervals on the three-phase lines of the power grid, and collect instantaneous current information on the three-phase lines at each monitoring point;

[0024] (2) Calculate the zero-sequence current of each monitoring point according to the instantaneous current information;

[0025] (3) Compare the calculated zero-sequence current value of each monitoring point with the preset zero-sequence current threshold, and if the calculated zero-sequence current value is less than the preset zero-sequence current threshold, it is determined that the grid has no faults , if the calculated zero-sequence current value is greater than or equal to the preset zero-sequence c...

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Abstract

The present invention discloses a power grid fault location method and system. The method comprises the following steps: setting a monitoring point, and collecting the instant current information on a three-phase line at each monitoring point; calculating the zero sequence current of each monitoring point; determining whether a power grid has faults or not according to a zero sequence current value; and determining the fault position according to the zero sequence current phase difference of adjacent monitoring points. The system comprises monitoring units arranged at intervals along the three-phase line of the power grid and a work station monitoring center connected with the monitoring units. Compared to the prior art, the power grid fault location method and system can perform fault location in time and accurately perform feedback of the power grid fault points without further manual checking so as to greatly reduce the maintenance cost, improve the power grid fault maintenance efficiency and be worth of being generalized.

Description

technical field [0001] The invention relates to the technical field of electric energy monitoring, in particular to a power grid fault location method and a location system. Background technique [0002] Power distribution is the link in the power system that is directly connected to users and distributes electric energy to users. The distribution substation consists of a distribution substation (usually reducing the transmission voltage of the grid to a distribution voltage), a high-voltage distribution line (that is, a voltage above 1 kV), a distribution transformer, and a low-voltage distribution line (1 kV The following voltage) and corresponding control and protection equipment, the distribution voltage is usually 35-60 kV and 3-10 kV. The neutral point of my country's distribution network is not grounded, which belongs to the small current grounding system. In the actual operation of the distribution network, grounding and short-circuit faults sometimes occur. Genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088G01R31/086
Inventor 段清明梁冰琪郭宁
Owner JILIN UNIV
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