Problem 1 A 240/120V, 60HZ ideal transformer is rated at 5KVA. 1) Calculate the a-ratio 2) Calculate the rated primary and secondary currents 3) Calculate the primary and secondary currents when the transformer delivers 3.2kW at rated secondary voltage and at 0.8 lagging power factor.

Problem 1 A 240/120V, 60HZ ideal transformer is rated at 5KVA. 1) Calculate the a-ratio 2) Calculate the rated primary and secondary currents 3) Calculate the primary and secondary currents when the transformer delivers 3.2kW at rated secondary voltage and at 0.8 lagging power factor.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.15P: Rework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at...

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Concept explainers

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.

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Problem 1
A 240/120V, 60HZ ideal transformer is rated at 5KVA.
1) Calculate the a-ratio
2) Calculate the rated primary and secondary currents
3) Calculate the primary and secondary currents when the transformer delivers 3.2kW at
rated secondary voltage and at 0.8 lagging power factor.

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