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The incoming voltage from the source to the transformer is called primary voltage.
An earthing transformer provides a neutral in a delta connected system.
A power transformer is used to provide power (to your home, for example), an instrument transformer is used to measure voltage or current (for metering, for example).
In a transformer it is known as the transformer core.
Injecting power into the higher voltage winding of a transformer will make it act as a step down transformer; injecting power into the lower voltage winding will make it act as a step up transformer. A transformer can be used both ways.