  This paper presents an optimization framework for sequential reconfiguration
using an assortment of switching devices and repair process in distribution
system restoration. Compared to existing studies, this paper considers types,
capabilities and operational limits of different switching devices, making it
applicable in practice. We develop a novel multi-phase method to find the
optimal sequential operation of various switching devices and repair faulted
areas. We consider circuit breakers, reclosers, sectionalizers, load breaker
switches, and fuses. The switching operation problem is decomposed into two
mixed-integer linear programming (MILP) subproblems. The first subproblem
determines the optimal network topology and estimates the number of steps to
reach that topology, while the second subproblem generates a sequence of
switching operations to coordinate the switches. For repairing the faults, we
design an MILP model that dispatches repair crews to clear faults and replace
melted fuses. After clearing a fault, we update the topology of the network by
generating a new sequence of switching operations, and the process continues
until all faults are cleared. To improve the computational efficiency, a
network reduction algorithm is developed to group line sections, such that only
switchable sections are present in the reduced network. The proposed method is
validated on the IEEE 123-bus and 8500-bus systems.
