Q5Basic Electrical Engineering

Question

Q.5. An 1100/400 V, 50 Hz single phase transformer has 100 turns on the secondary winding. Calculate the number of turns on its primary winding.

Answer 1

For an ideal transformer, the ratio of the primary voltage to the secondary voltage is exactly equal to the ratio of the primary turns to the secondary turns. This is known as the voltage transformation ratio.

\frac{V _{1}}{V _{2}} = \frac{N _{1}}{N _{2}}

Given values: Primary Voltage ( $V_{1}$ ) = 1100 V Secondary Voltage ( $V_{2}$ ) = 400 V Secondary Turns ( $N_{2}$ ) = 100 We need to find Primary Turns ( $N_{1}$ ):

N_{1} = (\frac{V _{1}}{V _{2}}) \times N_{2} = (\frac{1100}{400}) \times 100 = 2.75 \times 100 = 275 turns

Q5Basic Electrical Engineering

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