Ring Main Distribution System
Another distribution system which eliminates the disadvantages of the radial system is used in practice called the main ring distribution system.
In such a system, the feeders cover the entire supply zone in the form of a ring and finally terminate in the substation from where it starts. The feeder is in closed loop of and looks like a ring hence the name given to the system as the main ring system. This is shown in Fig. 1.
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The feeder in the fashion ring is divided into the number of sections as AB, BC, CD, DE and EA. The different distributors are connected in A, B, C, D and E. Each distributor is supplied by the two feeders and therefore the design is similar to the two feeders in parallel in different paths. Therefore, if there is a fault in any part of the feeder, consumers will still continue to receive continuous supply. For example, if the fault occurs at point P in section AB of the feeder it can be isolated and repaired. The feeder can be fed at one or more feed points. Thus, the disadvantages of the radial system are eliminated in this system. Great savings on copper is another important advantage of the main ring system.