Electrical fire early warning system capable of identifying various electrical hidden dangers

An early warning system and three-phase voltage technology, applied in continuity testing and other directions, can solve problems such as single prevention and control functions, neutral point offset, and accidents, and achieve the effect of facilitating on-site operations

Pending Publication Date: 2021-11-09
SHENYANG FIRE RES INST OF MEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The neutral line maintains the balance of the three-phase load. Once it is disconnected, the neutral point will shift, causing the equipment to fail to work normally, and serious accidents may occur
The current equipment is not accurate enough for the detection of neutral wire disconnection
In addition, the current electrical testing equipment does not have the ability to detect a variety of electrical problems, resulting in the need for testing personnel to carry a large amount of equipment. Most electrical fire monitoring systems only monitor temperature and residual current, and have a single prevention and control function

Method used

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  • Electrical fire early warning system capable of identifying various electrical hidden dangers

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Embodiment Construction

[0019] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0020] The present invention provides a method for detecting disconnection of neutral line, comprising the following steps:

[0021] S1. Obtain three-phase current and three-phase voltage;

[0022] S2. Calculate harmonics based on three-phase current;

[0023] S3. When the three-phase load is in a balanced state, and the third harmonic mutation of the current occurs continuously before the fault position of the neutral line, it is determined that the neutral line is disconnected; when the three-phase load is unbalanced, the neutral line current Approaching zero and comparing the measured three-phase voltage with the three-phase volta...

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Abstract

The invention discloses an electrical fire early warning system capable of identifying various electrical hidden dangers, and relates to the technical field of electrical detection devices, and the electrical fire early warning system comprises the following steps: S1, obtaining a three-phase current and a three-phase voltage; S2, calculating harmonic waves based on the three-phase current; S3, when the three-phase load is in a balanced state, determining that the neutral line is broken if third harmonic abrupt change of the current continuously occurs in front of the fault position of the neutral line; and in a three-phase load imbalance state, when the neutral line current approaches zero, the measured three-phase voltage is compared with the three-phase voltage after the neutral line is broken, which is calculated based on the three-phase imbalance degree, and when the error is within a set range, determining that the neutral line is broken. According to the technical scheme provided by the invention, the broken line fault of the neutral line can be identified more accurately.

Description

technical field [0001] The invention relates to the technical field of electrical detection devices, in particular to an electrical fire early warning system that can identify various electrical hidden dangers. Background technique [0002] The neutral line maintains the balance of the three-phase load. Once disconnected, it will cause the neutral point to shift, causing the equipment to fail to work normally, and serious accidents can occur. Current equipment is not accurate enough to detect neutral wire breakage. In addition, the current electrical testing equipment does not have the ability to detect various electrical problems, resulting in the need for testing personnel to carry a large amount of equipment. Most electrical fire monitoring systems only monitor temperature and residual current, and have a single prevention and control function. The working process is to use residual current transformers and temperature sensors to collect the line residual current and lin...

Claims

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Application Information

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IPC IPC(8): G01R31/54
CPCG01R31/54
Inventor高翱余广智王玮王阳王聪聪芦日新李多君白晋豪
OwnerSHENYANG FIRE RES INST OF MEM