Machine Parts

Phasing of a transformer :  Two dimensional vector is known as phasor.As the vector diagram of a transformer is drawn in phasor form and this is called the phasing of transformer. When load is applied to the secondary terminal the current that flows through the secondary terminal opposite to the primary current from lenz’s law.So flux is reduced,causes the induced emf in the primary winding is also reduced and therefore more current flows in the primary winding.This increased primary current will cause the flux to increase its original value.When more load current flow through secondary,the process is repeated. Phasor diagram with load : When load is connected the load current I 2 is   lagging E 2 .I 1 ̕   is the current that flows in the primary winding to balance the demagnetizing effect of I 2 .Since the flux remains constant I o   must be the same current that energizes the transformer at no load I 1 the actual current that   flows in the p