Single-phase earth fault incremental phase selection protection method and device

A single-phase ground fault and phase selection technology, which is applied to measuring devices, fault locations, and fault detection by conductor type, etc., to avoid electrocution of humans and animals, reduce manufacturing difficulty, and save equipment manufacturing costs and operation and maintenance costs.

Pending Publication Date: 2022-01-07
安徽英玮信息技术有限公司
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Problems solved by technology

[0020] Aiming at the deficiencies of the prior art, the present invention provides a single-phase ground fault incremental phase selection protection method and device, which solves the problem of relying on special zero-sequence voltage and zero-sequence current equipment in the processing of ground faults from low resistance to high resistance. As well as the influence of the cable on the ground capacitance current and the influence of the overcompensation of the arc suppressing coil

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  • Single-phase earth fault incremental phase selection protection method and device
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  • Single-phase earth fault incremental phase selection protection method and device

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[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] see Figure 1-7 , the present invention provides a technical solution: a single-phase ground fault incremental phase selection protection method and device, including a three-phase measuring current transformer, a protection controller, and a high-voltage circuit breaker. The method of the present invention collects data from the current transformer. The feeder current is analyzed, and its fault characteristic quantity is analy...

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Abstract

The invention discloses a single-phase earth fault incremental phase selection protection method and device, which relate to the technical field of power distribution network relay protection. According to the single-phase earth fault incremental phase selection protection method and device, on the premise that a special zero-sequence current transformer and a zero-sequence voltage transformer in an existing method are omitted, the mode of being shared with a conventional measurement current transformer is adopted, the equipment manufacturing cost and the operation and maintenance cost are saved to the maximum extent, the equipment structure is simplified, and the manufacturing difficulty is reduced. Through the incremental current phase selection technology, the technology of eliminating arc suppression coil interference and feeder line cable capacitance current interference is realized, and the technical problem of realizing earth fault detection from low resistance to high resistance without zero sequence voltage is solved.

Description

technical field [0001] The invention relates to the technical field of power distribution network relay protection, in particular to a method and device for incremental phase selection protection for single-phase grounding faults. Background technique [0002] At present, the power grid is developing with each passing day, and the urban 10kV distribution network lines are gradually developing in the direction of intelligence. All walks of life have higher and higher requirements for network security operation, and the requirements for the reliability of line operation and intelligent control are more stringent. Accurately locating grid ground faults and minimizing isolation are the basis for grid power supply reliability. Avoiding the three major problems of human and animal electrocution caused by single-phase ground fault, fire caused by electrical equipment, and equipment damage caused by the expansion of ground fault electrical faults is the responsibility of the power g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52Y04S10/52
Inventor 贾延海俞洋
Owner 安徽英玮信息技术有限公司
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