More and more dynamic positioning ships choose to use closed-loop power grid systems in the design of the power distribution networks in order to save energy and reduce emissions, operate economically, and improve the reliability and flexibility of power distribution networks. DNV, ABS, CCS and other classification societies have also put forward corresponding inspection requirements for the design of closed-loop power grids in specifications and guidelines, among which advanced generator protection is one of the key points of the reliability assessment of the closed-loop power grids by these classification societies. Based on the specification requirements for the advanced generator protection, the design points of the advanced generator protection are analyzed from typical power grid faults combined with the current practical applications. It is hoped to provide references for the subsequent design of the closed-loop power grid.