Three Phase Transformer Generation, transmission and distrbution of electric energy is invariably done through the use of three-phase* systems because of its several advantages over single-phase systems. Assuch, a large number of three-phase transformers are inducted in a 3-phase energy system for stepping-up or stepping-down the voltage as required. For 3-phase up or down transformation,… Read more

Methods of limiting the effects of armature reaction – The cross-magnetizing effect of armature m.m.f. can be minimised at the design and construction stage of a D.C. machine. Various methods of mitigating the effects of armaturereaction are discussed below :(a) High-reluctance pole tips – If thereluctance of the pole tips is increased, then the magnitude… Read more

Armature reaction in d.c machines – The armature m.m.f. produces two undesirable effects on the main field flux and these are :(1) net reduction in the main field flux(2) distortion of the main field flux Effects of armature reaction in d.c machine (1) iron losses – These losses depend on the maximum value of flux… Read more