Study of Actuation Current Value of Residual Current Operated Protective Devices
If a rural low voltage grid(AC 50HZ,380V/220V,direct neutral point grounding) applies the TT work mode,and the residual current operated protective device is installed respectively to a three-layer residual current protective system which is constituted by VCC,branch circuit and load end.This paper systematically analyzes the setting of actuation current value of current operated protective devices on all levels,offers a high guidance value over safe and stable function of the rural low voltage grid.