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Low-current grounding fault judgment method and fault recording system

A technology of small current grounding and fault recording, applied in fault location, signal transmission system, fault detection according to conductor type, etc., can solve problems that are not conducive to accurate fault analysis, inability to distinguish fault phases in a timely and effective manner, and unfavorable record preservation and other issues to achieve the effect of low power consumption standby

Inactive Publication Date: 2020-02-14
烟台科大正信电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Without a wave recording system, it is not conducive to accurate analysis of faults, and it is impossible to distinguish faults in a timely and effective manner
Also detrimental to record keeping of failures

Method used

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  • Low-current grounding fault judgment method and fault recording system
  • Low-current grounding fault judgment method and fault recording system
  • Low-current grounding fault judgment method and fault recording system

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specific Embodiment approach

[0048] It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Any modification of the structure, the change of the proportional relationship or the adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the technical content disclosed in the present invention. within the scope of coverage.

[0049] At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relat...

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Abstract

The invention discloses a low-current grounding fault judgment method and a fault recording system. The system comprises an A / D acquisition module, a DFT filtering module, a data storage module, a wireless communication module, an encryption module, a main processor, an external maintenance communication module and an integrated power module. According to the invention, the Fourier transform filtering processing is carried out on collected data, other frequency harmonics can be filtered out, the voltage jump judgment is carried out after clean waveform data is obtained, the Hilbert transform is carried out on electric energy, the electric energy is judged to obtain a small-current grounding fault signal, and a point location where a fault occurs can be accurately identified.

Description

technical field [0001] The invention relates to the technical field of distribution network automation, in particular to a small-current grounding fault judgment method and a fault recording system. Background technique [0002] The most common and also the most dangerous fault on a transmission line is an abnormal connection between phases or between phases and ground, that is, a short circuit. These faults are divided into single-phase-to-ground short-circuit, two-phase-to-phase-to-phase short-circuit, two-phase-to-ground short-circuit and three-phase ground short-circuit in the power system. Among them, the single-phase grounding short circuit is the most common, and the three-phase short circuit is relatively rare. When a short circuit occurs, a large short-circuit current will be generated, and at the same time, the voltage in the system will be greatly reduced. When a single-phase-to-ground fault occurs in the line, the value of the fault current is often much smalle...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/08G08C17/02
CPCG01R31/086G08C17/02
Inventor 温学斌王子鸣郑龙全韩卫卫
Owner 烟台科大正信电气有限公司