Three Phase Transformer

Reply Fri 8 Nov, 2013 12:59 pm
Hello I am just stuck on a three phase transformer question.

A 5KVA, 3 phase transformer, Y-Y (Star) has a primary line voltage of 500V and secondary line voltage of 200V, supplying to a load of 75 ohm with the line impedance of 40. Calculate the line current in primary
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Reply Fri 8 Nov, 2013 01:02 pm
Click on the following link for help:
Reply Fri 8 Nov, 2013 01:09 pm
I am still struggling with it .. I have been given the approximate answer but dont quite get how its been calculated
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Reply Sat 9 Nov, 2013 10:48 am
Can you calculate the secondary current? Since the power (KVA) load in the secondary is the same for the primary, your primary current will vary from the secondary based on the applied voltage. Pri KVA=Sec KVA.
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