Ground fault location method for resonant grounded system based on phase current and phase comparison

Abstract

The invention provides a resonant grounding system single-phase-to-ground fault zone location method using phase current mutation high frequency signal phase comparison. The method comprises the steps that 1 the phase voltage mutation and the phase current mutation of each data acquisition device are calculated; 2 a matrix beam algorithm is used to calculate the phase of all frequency components of the phase voltage mutation and the phase current mutation; 3 a fault phase and a perfect phase are identified; 4 the phase angle difference absolute dj of any high-frequency component of the fault phase current mutation and any high-frequency component of the perfect phase current mutation of the same acquisition device is calculated; and 5 the magnitude of all djs is determined to identify a fault zone. According to the method provided by the invention, a high-frequency signal of the phase current mutation is simply used; the fault zone is located by comparing the high-frequency signal phase between a fault phase and a certain perfect phase of the same acquisition site; and filtering is prevented.

Description

technical field [0001] The invention belongs to the field of relay protection for distribution networks, and in particular relates to a method for locating a single-phase ground fault section of a resonant ground system. Background technique [0002] The single-phase grounding line selection and section positioning of the resonant grounding system has always been a research hotspot and difficulty. At present, it is mainly based on the characteristics of zero-sequence voltage and current. This type of method needs to obtain zero-sequence voltage and zero-sequence current, which is not conducive to engineering realization. , so it is of great significance to study a bootstrapped segment location method based on phase voltage and current information. Contents of the invention [0003] The object of the present invention is to provide a method for locating a single-phase ground fault section of a resonant grounding system using high-frequency signal phase comparison of sudden ...

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Problems solved by technology

[0002] The single-phase grounding line selection and section positioning of the resonant grounding system has always been a research hotspot and difficulty. At present, it is mainly based on the characteristics of zero-sequence voltage and current. This type of method needs to obtain zero-sequence voltage and zero-sequence current, which is not conducive to engineering realization. , so it is of great significance to study a bootstrapped segment location method based on phase voltage and current information

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