the purpose of the primary windings of a transformer is a varying magnetic field.
the purpose of the primary windings of a transformer is a varying magnetic field.
what is the purpose of the primary windings of a transformer?
a varying magnetic field
coils can have more than one winding, insulated electrically from each other. when there are two or more windings around a common magnetic axis, the windings are said to be inductively coupled or magnetically coupled. a time-varying current through one winding will create a time-varying magnetic field which passes through the other winding, which will induce a time-varying voltage in the other windings. this is called a transformer. the winding to which current is applied, which creates the magnetic field, is called the "primary winding". the other windings are called "secondary windings".









































section::::magnetic core.
electromagnetic coil
for polyphase systems, multiple single-phase transformers can be used, or all phases can be connected to a single polyphase transformer. for a three phase transformer, the three primary windings are connected together and the three secondary windings are connected together. examples of connections are wye-delta, delta-wye, delta-delta, and wye-wye. a vector group indicates the configuration of the windings and the phase angle difference between them. if a winding is connected to earth (grounded), the earth connection point is usually the center point of a wye winding. if the secondary is a delta winding, the ground may be connected to a center tap on one winding (high leg delta) or one phase may be grounded (corner grounded delta). a special purpose polyphase transformer is the zigzag transformer. there are many possible configurations that may involve more or fewer than six windings and various tap connections.
transformer types