Transformers connected in wye-delta

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Homework Help Overview

The discussion revolves around a problem involving three single-phase transformers rated at 100kVA, connected in a wye-delta configuration on a 3-phase, 18kV line. The original poster seeks to determine the maximum load for the transformer bank and the outgoing line voltage.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the secondary voltage based on the primary voltage but expresses uncertainty about the implications of the transformer connections and the line voltage. Some participants question the validity of the voltage ratings in relation to the line voltage.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the transformer voltage ratings and their implications. There is no explicit consensus, but some guidance regarding the measurement of voltages in delta and wye configurations has been suggested.

Contextual Notes

Participants note a potential discrepancy in the voltage ratings, specifically questioning the connection of a 2.4kV transformer to an 18kV line, which may indicate missing information or assumptions that need clarification.

a_hargy
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Homework Statement


Three single phase transformers rated 100kVA, 13.2kV/2.4KV are connected in wye-delta on a 3-phase, 18kV line.

I need to find the maximum load that can be connected to the transformer bank and the outgoing line voltage.


Homework Equations





The Attempt at a Solution


I am completely stuck, so far I've got:
Voltage across primary is 2.4kV therefore voltage across secondary is 13.2kV
Es=13.2[tex]\sqrt{3}[/tex]=22.86kV?

Any help would be greatly appreciated.

Adam
 
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This can't be right can it? Do you have a 2.4KV transformer connected to an 18KV line?
 
I'm not 100% sure if that's what the question is implying as I'm completely stuck on it.
Thanks for the quick reply though.
 
Well, I don't know how 3 phase transformers are voltage rated, as I haven't studied them. However, if the voltage of a Delta is measured from phase to phase and voltage of a Wye is measured neutral to any phase, then you don't use the factor of sqrt(3).
 

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