Series arc fault detection method, device and equipment and storage medium

Abstract

The invention discloses a series arc fault detection method, device and equipment and a storage medium, and the method comprises the steps: obtaining a corresponding electrical quantity frequency spectrum according to the obtained electrical quantity of a DC power system; performing mathematical morphological operation on the electrical quantity spectrum to obtain a fluctuation component of the electrical quantity spectrum; calculating a characteristic value in a preset characteristic frequency band according to the fluctuation component to obtain an arc characteristic value; and according to the arc characteristic value, determining whether a series arc fault exists in the DC power system. The electrical quantity frequency spectrum of the DC power system is calculated based on mathematical morphology, the basic shape of the electrical quantity frequency spectrum and the characteristic information of the series arc fault can be reserved when the series arc fault occurs in the DC power system, the extracted arc characteristic value is ensured to be accurate, and the accuracy of the extracted arc characteristic value is improved. It is ensured that the series arc fault in the direct-current power system is effectively detected in time, and the detection reliability and the safety of the direct-current power system are improved.

Description

technical field [0001] The present application relates to the technical field of power systems, in particular to a series arc fault detection method, device, equipment and storage medium. Background technique [0002] In the DC power system, due to reasons such as loose connectors and aging of cable materials, DC arc faults may occur, and because DC arcs are easy to maintain stable combustion, the heat generated by them can generate thousands of degrees of high temperature after accumulation, so , DC arc faults are likely to cause fires. [0003] The arcs are classified according to the location where the arcs occur, and can be divided into series arcs, parallel arcs, and grounding arcs. Among them, when parallel arcs occur, the loop current changes significantly, and the possibility and frequency of series arc occurrence are the highest, and series arc faults occur After that, the DC voltage and DC current amplitude in the loop will not change significantly. [0004] In t...

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Problems solved by technology

[0005] This application provides a series arc fault detection method, device, equipment and storage medium, aiming to solve the problem that the electrical protection device in the prior art cannot effectively detect the series arc fault in the circuit, resulting in false failure report and fire The problem

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