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Leakage current fault detection method, device and system

A detection method and detection device technology, applied in the direction of measuring devices, circuit devices, emergency protection circuit devices, etc., can solve problems such as rejection action, leakage protector misoperation, etc.

Active Publication Date: 2018-12-18
孙麓轩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a leakage current fault detection method, device and system to effectively solve the problem of misoperation or refusal of operation of the leakage protector

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  • Leakage current fault detection method, device and system
  • Leakage current fault detection method, device and system

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Embodiment Construction

[0054] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0055] figure 1 It is a flowchart of a detection method for a leakage current fault provided by an embodiment of the present invention. Such as figure 1 As shown, the detection method of the leakage current fault provided by an embodiment of the present invention includes:

[0056]In step S101, the leakage current generated by the line at each moment during the preset time period and the total current of the line at each moment within the preset time period are acquired.

[0057] In this embodiment, the total current of the line at each moment may include normal current and leakage current of the line at the current moment. In addition, the leakage current a...

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Abstract

Embodiments of the present invention provide a leakage current fault detection method, device and system. The method comprises the following steps: obtaining leakage current generated in a circuit ateach moment in a preset period of time and total current at each moment in the preset period of time; determining a first function image of the leakage current varying with time according to the leakage current generated in the circuit at each moment in the preset period of time; determining a second function image of the total current varying with time according to the total current of the line at each moment in the preset period of time; determining difference between a change trend of the first function image and a change trend of the second function image according to the first function image and the second function image; and realizing leakage current fault detection by judging whether a leakage current fault exists in the circuit according to the difference. The invention can effectively solve the problem of misoperation or refusal to action existing in a leakage protector.

Description

technical field [0001] The invention relates to the field of line protection, in particular to a detection method, device and system for a leakage current fault. Background technique [0002] Most of the existing detection and protection methods for leakage current faults use leakage protectors. The zero-sequence transformer in the leakage protector detects the residual current in the line, that is, the leakage current. If the detected residual current is greater than the preset protection setting value, the electromagnetic mechanism is driven to act, and the leakage protector is disconnected to generate leakage current. line. [0003] However, leakage protectors have problems of malfunction and refusal to operate. Specifically, in many occasions, for example, in the computer room, leakage current is difficult to avoid, because there is a certain leakage current when the load equipment is powered on the line, when the load equipment on the line increases, this normal leaka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/33G01R31/02
CPCG01R31/50H02H3/33
Inventor 孙麓轩
Owner 孙麓轩
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