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DC arc fault detection method, device and system

A DC arc and fault detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as power failure, and achieve the effect of avoiding unnecessary tripping

Active Publication Date: 2022-07-22
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unnecessary tripping can lead to many disadvantages such as power outages and extra maintenance

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  • DC arc fault detection method, device and system
  • DC arc fault detection method, device and system
  • DC arc fault detection method, device and system

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Embodiment Construction

[0083] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, and are not used to limit the protection scope of the present invention.

[0084] For the sake of brevity and intuition in description, the solution of the present invention is explained below by describing several representative embodiments. Numerous details in the embodiments are provided only to aid in understanding the aspects of the invention. However, it is obvious that the technical solutions of the present invention may not be limited to these details during implementation. In order to avoid unnecessarily obscuring aspects of the present invention, some embodiments are not described in detail, but merely framed. Hereinafter, "inc...

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Abstract

The embodiments of the present invention disclose a DC arc fault detection method, device and system. The method includes: detecting a current high frequency component of a direct current signal in a first time period; when the number of current high frequency components detected in the first time period is greater than a first predetermined threshold, at the first time The current high frequency component of the DC current signal is detected in a second time period after the period; when the number of current high frequency components detected in the second time period is greater than a second predetermined threshold, a DC arc fault is determined. The embodiments of the present invention set thresholds for counting high-frequency components of the current for the arcing stage and the stabilization stage respectively, and comprehensively determine whether an arc fault is detected based on the judgment results of the two thresholds, which solves the problem of rejecting tripping or not tripping when it should be tripped. the problem of unnecessary tripping.

Description

technical field [0001] The present invention relates to the field of arc fault (Arc Fault, AF) technology, and in particular, to a method, device and system for detecting a DC arc fault. Background technique [0002] An arc fault is an electrical fault in which an unintended arc occurs between conductors or between conductors and ground. According to the connection relationship between the arc and the circuit when the arc fault occurs, the arc fault can be divided into series arc fault, parallel arc fault, grounding arc fault and compound arc fault, and so on. Once an arc fault occurs, since the arc current is usually outside the thermal protection zone, it is difficult for the existing thermal circuit breaker to detect such a fault, and cannot protect the line before the fault is out of control in the early stage. Therefore, there is an urgent need for a reliable arc fault detection method to detect arc faults. [0003] At present, almost all existing DC arc fault detecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 刘臻陈维刚杜峰卓越
Owner SIEMENS AG