A three-phase two-winding transformer rated 1200 MVA, 14kV/162kV has a leakage reactance of j0.10 pu. A three-phase load operating under balanced positive phase sequence conditions on the secondary side absorbs 1000 MVA at 3 0.9pf lagging with a terminal voltage of 161kV. Use the given information to answer the following questions: i) Draw a reactance diagram for the circuit. ii. Determine the following: The voltage at the primary when the primary side of the transformer is star connected iii. The voltage at the primary when the primary side of the transformer is delta connected

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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.