Novel protection scheme for residual current device‐based electric fault time detection and touch current identification

Research on the Principle of Residual Current Protection Technology Based on Transient Waveform Criterion

“…Under the action of the alternating magnetic flux, the induced electromotive force E2 is generated on the secondary side of the transformer [2]. This signal enters the single-chip microcomputer through the sampling resistor and the signal conditioning circuit to perform the leakage protection function after being sampled and processed.…”

Classification and identification of electric shock current for safety operation in power distribution network

“…Literature [7–11] combines wavelet packet transform, energy entropy, quantum genetics, and other artificial NN to establish a related classification model, which provides theoretical support for effective recognition types. In [12], the least squares SVM can accurately identify the electric shock current of the birth object from the total leakage current. Based on the principle of adaptive filtering, the literature [13] establishes an adaptive electric shock current detection model with good noise robustness and can effectively eliminate the dead zone of protection action.…”

“…Literature [7][8][9][10][11] combines wavelet packet transform, energy entropy, quantum genetics, and other artificial NN to establish a related classification model, which provides theoretical support for effective recognition types. In [12], the least squares SVM can accurately identify the electric shock current of the birth object IET Cyber-Phys. Syst., Theory Appl.…”

“…Based on the principle of adaptive filtering, the literature [13] establishes an adaptive electric shock current detection model with good noise robustness and can effectively eliminate the dead zone of protection action. However, the methods in [7][8][9][10] are mainly used for fault identification of power systems, and the literature [11][12][13] is mainly used for the identification of electric shock currents. Residual current protection is different from power system fault and, it is subject to changes in leakage current caused by various load changes.…”

An energy and leakage current monitoring system for abnormality detection in electrical appliances

“…To identify the residual current defect in low voltage distribution networks, a cooperative training classification model based on an upgraded squirrel search method for a semi-supervised SVM and the k-nearest neighbor is applied in 29 . A protection strategy based on least squares-SVM is designed and developed for residual current and touch current 30 . All aforementioned study deal with SVM based different strategies for fault detection in different systems where the proposed system developed rule-based classifiers for detecting sensor fault and load current fault and MSVM is applied for leakage current fault through proper classification in a household environment.…”