Problem: The rating of three phases of a 3 winding transformer are: Primary Y-connected: 15MVA,66KV Secondary Y-connected: 10MVA,13.2KV Tertiary A-connected: 5MVA,2.3KV Neglecting resistance, The leakage reactance are: Zps = 7% on 15MVA, 66KV base ZpT PS = 9% on 15MVA, 66KV base = 8% on 10MVA, 13.2KV base ZST Find the PU impedances of the star connected equivalent circuit for a base of 70KV, 30MVA in the primary circuit.

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Q: QUESTION 19 E-06, PC-02. Three inductors 15 mH, 15 mH and 15 mH are connected in series. What is the…

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Q: A 2.2 KVA, 480/4800-V, 50 Hz, single-phase transformer is tested with the following results. Find…

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Q: Write ‘T’ for True and ‘F’ for False The phase shift angle of a Δ-Y transformer can only be 30⁰

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Q: Three single phase transformers are connected in a Delta-Delta configuration. Each transformer is…

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Q: Three single phase transformers are connected in a Wye-Wye configuration.  Each transformer is rated…

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Q: A three phase power transformer having a line voltage ratio of 400 V to 33 kV is connected in…

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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.