Transformer Loading

[magdumshirish]

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Respected Sir,
Thank You Very Much For Reply.
Sir, My Problem Is As Follows
Transformer Specification Are:
Cpacity: 315kva
Voltage Ratio: 11kv/433v
Fl Pry Current: 16a
Fl Sec Current :420a
Continious Sc Current: 170a Const Non Motorised Load
Now I Want To Switch On Motor Say 6ohp
Suppose The Startting Current Is 6*fl(90)=360a
Or 360/1.732 =207a.
So Mometoraly Sec Current Is 170+360=53o For Some
Milliseconds
Or 170+207=377a
I Am Worried About First Case Of 530a
Please Guide Me About Secondary Susrrenttainable
Current Insuch Cases.
I Am Worried About Fluction Or Flicuring In Secondary
Votage.

 

[chaterpilar]

What type of starter are you using..?

Is this motor the only load on the transformer?

A softstarter is what i suggest as it is easy on transformers and also on voltage drops.

But 315 kva transformer will take the 60 hp "start", even if you are using the Y-D starter, provide that the transformer is not loaded with any other load.

Cheers.