Question: A three phase ac voltage controller is used to start and control the speed of a 3 phase 1 0 0 Hp , 4 6

A three phase ac voltage controller is used to start and control the speed of a 3 phase 100Hp ,460V, four pole induction motor driving a centrifugal pump. The power factor at full load is 0.85 and the efficiency is 80%. The motor's current is sinusoidal and the motor is connected in delta configuration.
a) determine the thyristor rms current rating
b) determine the peak voltage rating of the thyristor
c) determine the control range of the firing angle a

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