Support vector machine based fault electric arc detection method

Abstract

The invention provides a support vector machine based fault electric arc detection method, relating to the technical field of electric arc protection and solving the technical problem of improving fault electric arc identifying and judging accuracy. The method provided by the invention comprises the following concrete steps of: 1) acquiring current samples of circuits to be detected under different loads and working conditions; 2) normalizing the waveform of each current sample; 3) obtaining a test sample combination according to the normalized current samples; 4) dividing the test sample combination into a train set and a verification set; 5) calculating a kernel function parameter and a punishment parameter which have the highest prediction accuracy rate; 6) predicting each sample in the verification set; 7) training by utilizing different sample sets to obtain a weight matrix; 8) verifying the samples in the verification set by utilizing the weight matrix, and creating a detection model according to the verification result; and 9) identifying and judging the fault electric arc by utilizing the detection model. By applying the method provided by the invention, false operation of fault electric arc detection equipment under the action of an interference load can be effectively avoided.

Description

technical field [0001] The invention relates to arc protection technology, in particular to a technology based on a fault arc detection method based on a support vector machine. Background technique [0002] Indoor electrical lines and electrical equipment (such as electrical wiring, socket lines, internal lines of household appliances, etc.) after long-term operation, the insulation layer of the wires will age or be damaged, which will easily lead to arc faults between lines or short-circuit faults between lines and ground, and When a fault arc occurs, the current is usually very small, so that conventional line protection devices (such as residual current protection circuit breakers, fuses) cannot make accurate judgments on arc faults. [0003] Fault arcs in indoor electrical lines and electrical equipment are usually AC arcs, and AC arcs have the following characteristics: 1) There is a region where the current is close to zero in every half cycle, called "current zero re...

AI Technical Summary

Problems solved by technology

However, the voltage and current of some interfering loads (such as dimmers, switching power supply equipment, motor load equipment, equipment startup and shutdown, etc.) With the judgment method of AC fault arc, it is difficult to find a suitable characteristic value of fault arc to accurately distinguish the fault arc from the interfering load, which may easily cause malfunction of the fault arc detection equipment

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