A method to improve the accuracy of high transition resistance ground fault judgment

A technology of ground fault and transition resistance, which is applied in the direction of fault location, measurement of resistance/reactance/impedance, measurement of electrical variables, etc., can solve problems such as difficult to grasp, small steady-state characteristic quantity, etc., to reduce hazards, shorten power failure interval, The effect of improving power supply reliability

Active Publication Date: 2022-06-28
BAOJI POWER SUPPLY COMPANY OF STATE GRID SHAANXI ELECTRIC POWER +2
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Problems solved by technology

Large amount of transient features, but difficult to capture
The steady-state feature quantity is small, but the signal is stable and easy to identify

Method used

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  • A method to improve the accuracy of high transition resistance ground fault judgment
  • A method to improve the accuracy of high transition resistance ground fault judgment
  • A method to improve the accuracy of high transition resistance ground fault judgment

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Embodiment Construction

[0025] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] The invention receives the voltage and current information collected by the previous equipment of the distribution line, firstly judges the transient first half-wave method for the collected zero-sequence voltage and zero-sequence current and other related data, and then uses the FFT algorithm to calculate the zero-sequence voltage and the zero-sequence current. The magnitude and phase of the zero-sequence current are used for power integral calculation, and the zero-sequence active power is obtained to ju...

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Abstract

The invention discloses a method for improving the judgment accuracy of high transition resistance grounding faults. The voltage and current information collected by primary equipment on the distribution line is collected, and the transient first half-wave method is performed on the collected zero-sequence voltage and zero-sequence current. Judgment, and then use the FFT algorithm to calculate the amplitude and phase of the zero-sequence voltage and zero-sequence current for power integral calculation, and obtain the zero-sequence active power to judge the grounding interval. than comprehensively judge the fault interval. The present invention has the functions of line selection and section selection, precise isolation of fault sections, reducing the damage caused by grounding faults to lines, shortening the power outage interval, reducing the workload of distribution network operation and maintenance personnel to patrol lines, increasing the time for fault finding and processing, and improving the distribution network system power supply reliability.

Description

technical field [0001] The invention relates to the technical field of single-phase grounding fault judgment of a 10kV distribution network, in particular to a method for improving the judgment accuracy of a high transition resistance grounding fault. Background technique [0002] At this stage, most of the 10kV distribution networks use the neutral point non-effective grounding method, including the neutral point ungrounded system, the neutral point grounding system through the arc suppression coil, and the neutral point grounding system through a small resistance. But most of the current applications are neutral ungrounded systems. As the load in the distribution network increases year by year, there are more and more distribution equipment, the operating environment is complex, and the number of operating failures increases. Most of the faults in the distribution network are single-phase grounding faults, accounting for about 80% of the total faults. Although single-phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08G01R31/08
CPCG01R27/08G01R31/08
Inventor 李子伟王若鲁张阳娄欣蔺庚立郭海涛王勇李岩王建辉周宏宇
Owner BAOJI POWER SUPPLY COMPANY OF STATE GRID SHAANXI ELECTRIC POWER
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