Question on Delta-Delta transformer... pls advise.

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powersys

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Say the primary of the 3-phase delta-delta transformer is connected to 3-phase 415V supply. If the turn-ratio is 1-1, do u think there is any current (with significant value) in the secondary delta loop when no-load is connected to the secondary? Pls advise. Thanks.

 

Hi,
I think if there is no load connected and transformer is 1:1 with both delta windings, there will be only very small amount of leakage current in the secondary. Even though there is EM induction in the secondary.
I hope this is correct, yes i guess so.

BR,

Arif Khan

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    powersys

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I have the same thought as yours. I tested the configuration few days ago. Even the primary line-line voltage is very low (around 10Vrms), the current flowing in the secondary winding almost reached the rated value with no load connected to the secondary. Would u pls advise why such a high current in the 2nd winding? Thanks.
 

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