The magnetic leakage should be very small and designers go to some lengths to reduce it as far as possible because it causes leakage inductance, which is a bad thing. Ideally the magnetic field must be confined to the magnetic core of the transformer.
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The leakage flux is the magnetic flux that escapes the armature of the transformer and thus does not provide coupling from the primary windings to the secondary windings. If not minimized it can be a significant cause of energy loss and inefficiency in Transformers.
Any magnetic flux generated by the primary winding that doesn't link with the secondary winding is called 'leakage' flux.
The changing magnetic flux in the iron core of the transformer induces a voltage in the windings.
The phase shift is caused by inductance in the transformer. Any inductance from magnetic flux that fails to link both windings is called leakage flux, and the resulting inductance is called leakage inductance.
This depends on the voltage, and whether it is a three phase or single phase transformer.
A single-phase transformer works with a single-phase supply, while a 3-phase transformer is used with a 3-phase supply. A single-phase transformer has 2 wires on the primary and secondary (ignoring taps) while a 3-phase tansformer has 3 or 4 wires on the primary and secondary.
By design are you going to wind the transformer yourself? In your design you need a 5:1 ratio. On the output side of the transformer any two legs of a three phase transformer is considered single phase voltage. Good luck on your project.