A three-phase Y-Y transformer has specifications of 25 MVA, 15/200 kV and an equivalent series impedance of 200+j670 Ω, referred to the high side. If rated voltage is applied to the high voltage winding, while a three-phase load is connected to the low side, the rated input power of the transformer is 23 MW with a factor of power of 0.86 delayed. Under these conditions, the terminal line voltage at the load relative to the low voltage terminal is :  a) 11,95 kV b) 13,78 kV c) 10,93 kV d) 15,80 kV e) 12,65 kV

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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.