K:28) A two wire DC ring main distributor ABCDEA is fed at point C with 220V supply. The resistances of go and return conductors of each section AB, BC, CD, DE and AE are 0.2 Ω each. The main supplies the loads of 10A at A, 15A at B, 20A at D, 30A at E. Estimate: i. voltage at each load point ii. minimum consumer voltage.

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Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.