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Full insulation required on high voltage winding.
Phasor diagram of three phase transformer. It is seen from the phasor diagram that the secondary phase voltage v an leads the primary phase voltage van by 30. 1 transformer when excited at no load only takes excitation current which leads the working flux by hysteretic angle α. 2 excitation current is made up of two components one in phase with the applied voltage v is called core loss component i c and another in phase with the working flux ø called magnetizing current i m.
The power generated at various generating stations is in three phase nature and the voltages are in the range of 13 2kv or 22kv. But if three identical coils each with the same number of coil turns are placed at an electrical angle of 120 o to each other on the same rotor shaft a three phase voltage supply would be generated. Flux of each limb uses the other two limbs for its return path with the three magnetic flux s in the core generated by the line voltages differing in time phase by 120 degrees.
In order to reduce the power loss to the distribution end the power is transmitted at somewhat higher voltages like 132 or 400kv. Three phase transformers are used to step up or step down the high voltages in various stages of power transmission system. Delta delta three phase transformer phasor diagram.
The three phase transformer construction is of two types. Thus the flux in the core remains nearly sinusoidal. 3 phase distribution transformers generally have a delta triangular connected primary winding and a star wye connected secondary winding.
Advantages of delta delta connection. In this type of construction there are three cores and two yokes. The 3 phase phasor diagram.
Similarly v bn leads v bn by 30º and v cn leads v cn by 30º this connection is also called 30º connection. Ideal for three wire motor loads. Previously we have only looked at single phase ac waveforms where a single multi turn coil rotates within a magnetic field.
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