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The wire used is usually are magnet wire. Magnet wire is a copper wire with a fleecing of varnish or some other artificial coating. Transformers for years have utilized Form wire, which is a lacquered type of magnet wire.
The conducting substance used for the winding depends upon the purpose. Diminutive power and signal transformers are wound with solid copper wire, shielded usually with enamel, and sometimes supplementary insulations. Superior power transformers may be wound with wire, copper, or aluminum rectangular conductors. Strip conductors are utilized for very grave currents. High rate of recurrence transformers operating in the 10’s to 100’s of kHz will have windings of wire to minimize the skin consequence losses in the conductors.
Large power transformers use multiple-trussed conductors as well, since still at low power frequencies non-identical distribution of current would otherwise subsist in high-current windings. Each string is shielded from the other, and the strands are assembled so that at definite points in the winding each portion occupies different next of kin positions in the complete conductor. This "transposition" balances the current flowing in each strand of the conductor, and lessens eddy current losses in the winding itself. The stranded conductor is also more elastic than a solid conductor of comparable size is.
For signal transformers, the windings may be positioned in a way to minimize seepage inductance and wander off capacitance to improve high-frequency reaction. This can be done by dividing up each coil into segments, and those segments placed in layers between the sections of the additional winding. This is known as a heaped type or interleaved winding.
To make the fundamental single-phase transformer more adaptable, both the primary and secondary windings can be prepared in 2 identical parts. The 2 parts can be reconnected either in a series or in parallel. This gives added flexibility as the primary winding can be switched for either 480 volts or 240 volts and the secondary winding can similarly be segregated into 2 equal parts providing either 120 or 240 volts. Either array will not affect the competence of the transformer. Secondary windings are charged with a slant such as 120/240 and can be attached in a series for 240V or in a parallel for 120V or 240/120V .Primary windings rated with ‘X’ such as 240 X 480 can function in series or parallel but are not intended for 3-wire operation. A transformer rated 240 X 480 primary, 120/240 secondary could be maneuvered in six varying combinations.
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