Ground fault line selection method based on discrete Frechet Distance

A line selection method and ground fault technology, applied in the field of ground fault line selection based on discrete FréchetDistance, to achieve wide applicability, fastness and accuracy

Inactive Publication Date: 2021-07-23
SHENG YE ELECTRIC CO LTD +1
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Problems solved by technology

[0004] The present invention provides a ground fault line selection method based on discrete FréchetDistance, to at least solve the shortcomings of existing line selection methods applied to flexible systems

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  • Ground fault line selection method based on discrete Frechet Distance
  • Ground fault line selection method based on discrete Frechet Distance
  • Ground fault line selection method based on discrete Frechet Distance

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[0043] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, rather than Full examples.

[0044] The embodiment of the present invention provides a ground fault line selection method based on discrete FréchetDistance, such as figure 1As shown, by collecting the zero-sequence voltage and zero-sequence current at the time of the fault, it can be judged whether the system is single-phase to ground fault according to the zero-sequence voltage. Use the wavelet packet transform to extract the characteristic quantity of the zero-sequence current when the single-phase ground fault occurs, and then use FréchetDistance to calculate the waveform similarity of the extracted characteristic quantity curve; finally, compare the similarity of each curve to select ...

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Abstract

The invention provides a ground fault line selection method based on discrete Frechet Distance. The method comprises the steps of: collecting fault information, and judging a fault reason according to the fault information; if the fault is a single-phase ground fault, extracting zero-sequence current signals before and after the fault time of each feeder line, and establishing a change curve of zero-sequence current and time; and comparing the current values of all the feeder lines in the same time period on the basis of a discrete Frechet Distance algorithm, and determining that the feeder line with the largest current value difference from the other feeder lines at the same moment is the fault line. Compared with the prior art, the line selection method can effectively solve the problem that the line selection rate is low under the high-resistance grounding condition, and the requirement for accuracy is met; and the method can be simultaneously applied to cable lines and overhead lines, and has wide applicability.

Description

technical field [0001] The invention relates to a ground fault line selection method, in particular to a ground fault line selection method based on discrete FréchetDistance. Background technique [0002] The traditional grounding system is divided into small current grounding system and high current grounding system, and the small current grounding system is divided into neutral point ungrounded system, neutral point through the arc suppression coil system and high impedance grounding system, high current grounding system is divided into It is a neutral point grounding system directly or a small impedance grounding system. In the 10-66kV power system, the small current grounding system is mainly used. For power systems, among all faults, the probability of single-phase-to-ground faults is about 70%, so how to identify single-phase-to-ground faults has become the mainstream of fault identification at present. For the large-current grounding system, since the current is rel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 魏国锋翁健洪王惠东张弛刘康礼张森
Owner SHENG YE ELECTRIC CO LTD
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