Living shock leakage protection feature recognition based

One kind of shock feature recognition of the living and leakage protection leakage protection method based on data collection unit comprising sequentially connected, a signal processing unit and a protection unit; data collection unit for collecting residual current total power lines and the line voltage signal, the signal processing means for recognizing the power-off signal leakage and issue a control command, after receiving the power-off protection control command unit for cutting power lines. The method includes acquiring a total leakage protection residual current and line voltage; uniform sampling; calculates the total residual current vector changes; calculating a complex impedance; impedance semicircle obtaining the center and radius; obtaining dispersion coefficient and impedance characteristic frequency and determines whether the living body shock occurred A step of. Advantageous effect of the invention is: do not depend on the magnitude of the residual current or a change is greater than the setting value. When the living body identifying feature to shock, immediate action, with protective desirable operating characteristics, particularly suitable for the final stage of the three-phase low-voltage distribution network protected four-wire line.