“…-the state (0,0,1) of the system is impossible as the restoration of sources D 1 , D 2 and D 3 must be in the state (2), in operating state (3), or in restoration state (0); -the state (0,1,1) of the system is impossible during the restoration of source D 1 the source D 2 is in operating state, and the source D 3 cannot be in unloaded mode (1): the source D 3 must be prepared for activation (2), work (3), or restoration (0); -the states (1,0,2) and (1,0,3) of the system cannot be considered when the source D 1 is in operating state and the source D 2 is in restoration state (0), the source D 3 cannot be prepared for activation (2) or work (3);…”