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A fault location method for multi-branch transmission lines

A transmission line and fault location technology, applied in the direction of fault location, measurement of electricity, measurement of electrical variables, etc., can solve problems that have not yet been discovered

Active Publication Date: 2021-04-09
国电电力河北新能源开发有限公司 +1
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Problems solved by technology

[0004] To sum up, for multi-branch transmission lines, there is no method that can solve its fault location very well.

Method used

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  • A fault location method for multi-branch transmission lines
  • A fault location method for multi-branch transmission lines
  • A fault location method for multi-branch transmission lines

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Embodiment Construction

[0028] based on the following Figure 1 ~ Figure 4 , specifically explain the preferred embodiment of the present invention.

[0029] At present, in the traveling wave method, both in the manufacture of high-frequency sampling devices and in the accuracy of the wave head identification method of traveling waves have been significantly improved, thus ensuring that the traveling wave method can obtain higher positioning accuracy. This provides a broad application prospect for the traveling wave method in the fault location of transmission lines. Although the application of traveling wave ranging on multi-branch transmission lines is limited, in the present invention, at first, the measurement of fault distance is realized by using traveling wave ranging, and then the judgment of false fault point is carried out in combination with other identification methods proposed by the present invention, Therefore, it not only ensures the advantage of high fault location accuracy, but als...

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Abstract

A multi-branch transmission line fault location method, using traveling wave distance measurement to realize the preliminary location of the fault point, obtain the fault distance between the fault point and the traveling wave measuring point, screen the power grid transmission lines, and obtain all distances between the traveling wave measuring point The distance is equal to the line position of the fault distance, using the actual zero-sequence current value measured by each terminal measuring device to calculate the theoretical zero-sequence voltage value of each terminal measuring device corresponding to the possible fault location, and calculate the possible fault location The deviation between the theoretical zero-sequence voltage value and the actual zero-sequence voltage value of each corresponding terminal measurement device is recorded as the zero-sequence voltage value deviation. Compared with all zero-sequence voltage value deviations, the smallest zero-sequence voltage value deviation corresponds to the possible The fault location is the real fault location. The invention effectively ensures the accuracy of fault location, makes up for the shortcoming of traveling wave ranging in multi-branch lines, and realizes fast and simple fault location.

Description

technical field [0001] The invention relates to the technical field of transmission line fault location, in particular to a multi-branch transmission line fault location method. Background technique [0002] In the power system, when a short-circuit fault occurs on the transmission line, it is necessary to rely on fault location technology to find the fault point, so as to repair the fault point in time and ensure the power supply reliability of the power grid. At present, the existing fault location technology, whether it is the impedance method or the traveling wave method, has a relatively narrow range of application for distance measurement, and it is used for fault location on a single line or a simple network, which cannot be applied to multi-branch lines. At present, with the interconnection of power grids, the multi-branch line structure has become very common, so it is necessary to invent a fault location method for multi-branch lines. [0003] Among all the fault ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/00
CPCG01R19/00G01R31/088
Inventor 张光军张科朱永利孙立志胡静波
Owner 国电电力河北新能源开发有限公司
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