a) Briefly explain the rotor construction in synchronous generator
b) A single phase 50 Hz transformer has 150 turns on the primary winding and 600 turns on the secondary winding. If the primary winding is connected to 240 V, 50 Hz determine
i) emf induced in secondary winding
ii) the maximum value of core flux
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Answers
Answer:
so the answer is as follow:
Step-by-step explanation:
a)In general, synchronous generator consists of two parts rotor and stator. The rotor part consists of field poles and stator part consists of armature conductors. The rotation of field poles in the presence of armature conductors induces an alternating voltage which results in electrical power generation.
b)Let consider V/f ratio is constant
⇒ ,
At 60 Hz
Total losses
384 W
i)In a transformer, source of alternating current is applied to the primary winding. ... This alternating flux gets linked with the secondary winding, and because of the phenomenon of mutual induction an emf gets induced in the secondary winding.
ii)You can work out the flux base on the cross section of the core and the quantities you have given. Max flux = E/ (4.44 )= 0.0225225 wb. But for iron core transformer max flux density limited to 2 tesla. With over excitation , its value takes upto 1.7 -1.8 tesla.