(a) A $1,000 \mathrm{kVA}, 3.3 \mathrm{kV} 50 \mathrm{~Hz} 300 \mathrm{rpm}$ three phase alternator has 180 slots with 5 conductors per slot. Single layer winding with full pitch coils is used. The winding is star connected with one circuit per phase. Determine the specific electric and magnetic loading if the stator bore is 2 m and the core length is 0.4 m . Use the same loadings to determine the corresponding data for a $1,250, \mathrm{kVA}, 3.3 \mathrm{kV} 50 \mathrm{~Hz} 250 \mathrm{rpm}$ three phase star connected alternator having two circuits per phase. Both the machines have $60^{\circ}$ phase spread.
Explanation
To determine the specific electric and magnetic loading for the first machine, we need to calculate the total number of conductors, the stator bore, and the core length. We can then use the formula for specific electric loading and specific magnetic loading to calculate the values. To determine the specific electric and magnetic loading for the second machine, we need to calculate the total number of conductors, the stator bore, and the core length. We can then use the formula for specific electric loading and specific magnetic loading to calculate the values.
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