Power guarantee plan and device fault troubleshooting method

The invention provides a power guarantee plan and device fault troubleshooting method. A power guarantee region power grid plan comprises a plurality of distribution transformers, each distribution transformer is connected with a plurality of main distributors, and the main distributors are connected with a plurality of slave distribution cabinets. During power guarantee plan and device fault troubleshooting, a power guarantee range is firstly determined, and a power guarantee device set [P] is established; a planed power failure range is determined, and a planed power failure device set [Q] is established; a power failure accompanying device set [Q'] is established corresponding to each element in the planed power failure device set [Q]; a power guarantee cycle T is divided into a plurality of power guarantee periods T1, T2, ..., and Tr, planned power failure devices [Qr], power failure accompanying devices [Q'r], and a planned power failure duration Tr1 are determined before the coming of the Tr period, the