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Turn ratio is defined as high voltage to low voltage ratio as per IEEE standards. Now my doubt is:
In 3 phase transformer, Is it phase voltage ratio/or line voltage ratio?

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  • \$\begingroup\$ 3 pase loads like motors or water heaters may be connected using wye or delta circuit. There are transformers for wye or delta circuit. For all these circuits, a load between two phases is exposed to the voltage between these phases. A load between one phase and neutral is exposed to the line voltage. In this 12 pulse rectifier circuit, a transformer with two sets of secondary windings is used, one set in delta and the other in wye circuit. The primary windings are connected in wye circuit. \$\endgroup\$
    – Uwe
    Dec 14, 2017 at 10:40

2 Answers 2

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it's voltage between terminals.

for a wye winding it's line voltage (to neutral) for a Delta winding it's phase voltage (between phases)

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enter image description here n refers to inductance² or voltage ratio of paired windings.

But if it is Delta(line-line) winding to Wye (phase-N) \$V_L=\sqrt 3 V_P\$ is used to correct the n turns ratio for voltage.

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