c) A single phase 25 kVA, 1200/120 V, 60 Hz distribution transformer has the following parameters; R:: 0.8 0 Rz: 0.008 0 L1: 5.305 mH L2: 0.05305 mH Exciting admittance on the high voltage side = 0.003 – jo.02 S i. Draw the equivalent circuit referred to the primary voltage of the transformer. Determine the input terminal voltage of the transformer on the high voltage side. The transformer is supplying a rated load of 15 kVA a rated secondary voltage 120 V and at 0.8 power factor lagging (Neglecting the transformer exciting current).

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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.