A general solution for ring-bus distribution systems reliability

Reliability of power distribution schemes can always be improved at the expense of cost and size. The addition of extra paths proves to increase the continuity of supply. This is really where redundancy steps in, with its two constituents: components redundancy and unitpsilas redundancy. This approach is dealt with in this paper and reliability evaluations for various practical distribution schemes of power supply are considered. A general formula for calculation of ring-main feeders reliability is also developed and applied to these practical distribution schemes. In a ring-bus system, it is found that the reliability of each feeder is decreased by increasing the number of the outgoing feeders, so it is recommended that no more than six feeders are preferable to be connected on such a system.