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| Detection method of electric shock current based on envelope feature of time domain waveform of chaotic signal |
| (1. College of Mechanical and Electrical Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; 2. Changji Power Supply Company, State Grid Xinjiang Electric Power Company, Changji, Xinjiang 831100, China) |
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Abstract To solve the problems of residual current protection device with refusing to operate, maloperation and difficult extracting of electric shock current signal, a chaotic detection method of electric shock current was proposed based on time domain waveform envelope characteristics of chaotic signal. Based on the sensitivity of chaotic system to initial conditions and immunity to noise, a phase detection method was proposed by vector analysis according to chaos theory. According to the difference of output xtimedomain waveform envelope in different states of chaotic system, the standard deviation of xtimedomain waveform extreme point sequence was proposed as index to measure the fluctuation characteristics of waveform envelope, and the critical state of chaotic system could be automatically identified. A method of detecting the amplitude of electric shock current was proposed by vector analysis. The results show that the proposed chaotic criterion can accurately judge the periodic state and chaotic state of the system, and the electric shock current signal can be detected from the total residual current with average error of 4.64%.
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Received: 30 January 2021
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