3. With the instruments located on the high-voltage side short- circuited, the short-circuit test readings for the 50KVA, 2400:240V transformer are 48V, 20.8A, and 617W. An open-circuit test with the low-voltage side energized gives instrument readings on the side energized gives instrument readings on the side of 240V, 5.41A, and 186W. The transformer is connected as an autotransformer as shown in Figurel, in which c-a is the 240V winding and a- b is the 2400V winding. It is assumed that the 240V winding has enough insulation to a voltage of 2640V to ground. (a) Compute the voltage rating V, of the high side for this autotransformer connection. (b) Compute the kVA as an autotransformer. (c) Compute the full-load efficiency as an autotransformer operating with the rated load of 0.8 power factor lagging. I, - Is %3D Vs= 240V Vp V, Ik- Ip 2400V

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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.