Method for recognizing arc ground fault of distribution network

A ground fault and identification method technology, which is applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as arc light ground fault processing effect is not good, and achieve the effect of improving the safety and reliability of power grid operation
CN107797028AActive Publication Date: 2018-03-13YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Publication Date
2018-03-13

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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.
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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 ...

Claims

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