Protection method and apparatus for electric leakage and electric shock accident of power system

摘要

The present invention relates to a method and apparatus for protecting an electric shock and electric shock accident of a power system capable of preventing electric leakage and electric shock accidents caused by deterioration of insulation of electric wires. In one example, receiving the residual voltage value (Vn) and the leakage current value (Ig) of the wire line; - Determining whether the residual voltage (-Vn) in-phase leakage current value (I gr ) is greater than a preset current correction value; -Residual voltage (-Vn) In-phase current leakage current value (I gr2 ) - Residual voltage (-Vn) The current value is increased by subtracting leakage current value (I gr1) immediately before in-phase (I gr2 -I gr1 ) determining whether a value divided by the time taken to perform the operation (dt) is greater than a preset increase rate correction value (dI); and - when the residual voltage (-Vn) in-phase leakage current value (I gr ) is greater than the preset current correction value, transmitting a trip alarm signal to the wire line breaker; including, the -residual voltage (- Vn) The in-phase leakage current value (I gr ) is calculated by the following equation, I gr = Igcosθg, where θg is the phase difference between the leakage current value (Ig) and the residual voltage value (Vn) of the electric wire, the power system Disclosed is a method for protecting against electric leakage and electric shock.