But if the same load is connected across the open ends of the two windings [still at 240V] somewhat greater voltage drop will be produced.
I would take exception to that statement. The only way that would be true is if the load were to be large enough to collapse the delta a bit and thus lowering the voltage. That doesn't happen in a normally loaded transformer bank. If we have permitted the bank to have too much load that does indeed happen. What happens is that the voltage is lower to start with if the bank is overloaded.
Don't lose sight of the fact that the rated voltage output of a transformer will only happen when no load is on the transformer and the rated voltage is on the primary side. As soon as load is applied, the impedance will cause voltage drop through the transformer.
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Charlie Eldridge, Indianapolis,
Utility Power Guy
