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A method for identifying arc-flash ground faults in distribution networks

A ground fault and identification method technology, applied in the fault location, detecting faults according to conductor types, etc., can solve the problem of poor handling of arc ground faults, and achieve the effect of improving the reliability of safe operation of the power grid

Active Publication Date: 2020-03-10
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] In order to solve the problem that the processing effect of arcing grounding faults in the above technologies is not good and needs to be improved, this application provides a method for identifying arcing grounding faults in distribution networks

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  • A method for identifying arc-flash ground faults in distribution networks
  • A method for identifying arc-flash ground faults in distribution networks
  • A method for identifying arc-flash ground faults in distribution networks

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[0046] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following illustrative examples do not represent all implementations consistent with the present application; rather, they are merely means consistent with some aspects of the application as recited in the appended claims example of.

[0047] At present, arc grounding has always been a common fault in the distribution network, and it is a serious hidden danger to the safe operation of the power grid. Arc light grounding means that a certain phase voltage is short-circuited to the earth through an arc light, and generally occurs in a high-voltage non-neutral point grounding system. Among them, single-phase arc grounding is the most c...

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Abstract

The application relates to the technical field of distribution network line fault recognition and in particular to a method for recognizing an arc ground fault of a distribution network. The fault recognition method includes: determining the fault occurrence time of the distribution network line; extracting a plurality of cycle waveforms before and after the distribution network line fault; calculating the sampling phase angle difference sequence [phi](k) of the phase voltage of the distribution network line fault; calculating the first-order differential value sequence [delta]I(k) of the zero-sequence current after the distribution network line fault; obtaining a characteristic sequence M(k) according to the sampling phase angle difference sequence [phi](k) and the first-order differential value sequence [delta]I(k) of the zero-sequence current; and determining whether the distribution network line fault is an arc ground fault according to the number of abrupt change times of the characteristic sequence M(k) within a preset time. The fault recognition method can perform line maintenance and operation in areas with high incidence of arc faults of the distribution network, and can provide richer information on the safety maintenance and operation of the distribution network, and is very important for improving the reliability of the safe operation of the power grid.

Description

technical field [0001] The present application relates to the technical field of distribution network line fault identification, in particular to a distribution network arc-flash ground fault identification method. Background technique [0002] With the development of the economy, the power supply can no longer meet people's needs, and the security problem of the power grid is becoming more and more serious. Based on this, the development and expansion of the construction of the medium-voltage distribution network is the main task of the current economic development of the power grid. my country's medium and low voltage distribution network is dominated by overhead lines, the structure of the line is complex, there are many branches, and it is prone to failure. According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, and 70% of them are caused by single-phase ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 董涛王洪林刘亚东郭霖徽刘柱揆范黎涛
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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