Electrical fire cause analysis system and method

An analysis method and cause technology, applied in the field of smart home, can solve the problems of low current intensity, strong fire concealment, and lack of effective protection, and achieve the effect of improving electricity safety.

Active Publication Date: 2018-08-17
天津渤海物联科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an arc fault occurs, due to the low current intensity, which is far lower than the preset value of overcurrent protection devices such as leakage circuit breakers and fuses, effective protection cannot be obtained, resulting in strong concealment of fires caused by arc faults

Method used

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  • Electrical fire cause analysis system and method
  • Electrical fire cause analysis system and method
  • Electrical fire cause analysis system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1, a circuit schematic diagram of a fire cause analysis system, in which the electrical fire cause analysis of the power grid taking the mains as an example is schematically illustrated, and the main road signal acquisition module 1 includes a voltage sensor, a current sensor and a residual current sensor, which are used to detect the power grid The current / voltage of the main circuit, the signals collected by the voltage sensor, current sensor and residual current sensor are transmitted to the A / D conversion module and then to the processor through the signal conditioning module, and the signal conditioning module of the current sensor is connected with the A / D A wavelet filter is also connected between the conversion modules to filter out white noise and impulse noise, eliminate burrs and small protrusions in the current waveform, make the waveform smoother, but maintain the signal characteristics of the fault arc, the processor The phase, frequency, ph...

Embodiment 2

[0058] Please refer to Figure 5 , the difference between Embodiment 2 and Embodiment 1 is that the calculation method of the matching degree P is: take the current value of the ideal current waveform preset phase α as the ideal value I 1 , α is not the current zero-crossing point, take the current value of the same preset phase α of the load current waveform as the actual value I 2 , the preset phase α is 15° before / after the zero crossing point, and the matching degree P=I 2 / I 1 , because the current is extinguished before the zero crossing point and re-ignites after the zero crossing point, the existence of the flat shoulder area makes the preset phase α different, if I 2 Sampling in the flat shoulder area, then P will approach 0, if I 2 If the sampling is outside the flat shoulder area, then P tends to 1.

Embodiment 3

[0060] A fire cause analysis method,

[0061] Collect the current waveform of the main road in real time through the main road signal acquisition module 1, and extract the electrical parameters of the main road including at least the phase and frequency of the main road current;

[0062] By independently configuring the branch signal acquisition module 2 in each branch used to connect the load to collect the load current waveform in real time, extract the branch electric parameters at least including the effective value of the load current of each branch, and at the same time in each branch The branches connected to the load are all connected in series with the time-delay non-contact switch module 3, which is used to reduce the good arc interference generated during plugging.

[0063] generating ideal current waveforms respectively corresponding to the loads of each branch according to the effective value of the main circuit electric parameter and the load current in each bran...

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Abstract

The invention provides an electric fire cause analysis system and method. The method comprises the steps of: comparing an ideal current waveform with a load current waveform of a load of each branch, and generating a first score X in negative correlation with a matching degree P; utilizing a wavelet filter to carry out wavelet filtering on a main circuit current, and then carrying out wavelet analysis; calculating the number N of suddenly-changed signals in a preset phase interval, and generating a second core Y in positive correlation with the number N; calculating a weight sum of the second score Y and the first score X corresponding to a positive / negative semi-periodic wave where the central point of the preset phase interval corresponding to the second score Y is arranged, and obtaining a third score Z, wherein Z=q1X+Q2X, q1 is the weighted value of X, and q2 is the weighted value of Y; if Z is larger than a preset value, then determining that an faulted electric arc exists; and if Z is smaller than a preset value, then determining that no faulted electric arc exists. According to the invention, the generation of the faulted electric arc is reasonably determined combined with the characteristics of the faulted electric arc generating process, so that support is provided for early warning, alarming and protection, and the electricity utilization safety is improved.

Description

technical field [0001] The invention relates to the field of smart home, in particular to an electrical fire cause analysis method applied to a home grid. Background technique [0002] Electrical fires generally refer to the heat energy released due to faults in electrical circuits, electrical equipment, appliances, and power supply and distribution equipment; Fires caused by other combustible materials. In daily life, the occurrence of electrical fires mainly comes from the occurrence of loose lines and damaged insulation layers in household power distribution lines, and the occurrence of fault arcs due to long-term overload operation and insulation aging of power lines or internal lines of household appliances. It is usually accompanied by localized high-temperature sputtering of electrodes, which ignites nearby combustibles and causes a fire. [0003] The preventive means of electrical fires used in existing households are usually fuses or leakage circuit breakers, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 张磊
Owner 天津渤海物联科技股份有限公司
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