Distribution type method for protecting residual current of low voltage power supply system

The invention provides a distribution type method for protecting residual current for solving the problems of high malfunction rate or accurate action incapability of a residual current protective device. The method comprises the following steps that the residual current and duration time of the residual current of the residual current protective device are acquired; information is sent in real time to a superior residual current protective device; and the superior residual current protective device determines whether to act or not according to the received information so as to realize multi-grade cooperation for residual current protection and effectively reduce the malfunction rate of the residual current protective devices.