(1) A three-phase, half-wave controlled rectifier is fed from 380-V, 50-Hz ac supply.

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   Al-Ameeria Integrated Technical Education Cluster

BTEC Higher National Diploma in

Electrical & Electronic Engineering

 2^nd semester 2016/2017

Activities (3)

(1) A three-phase, half-wave controlled rectifier is fed from 380-V, 50-Hz ac supply. The load is a resistive load of 10W. Find the average values of the load voltage and load current at triggering angles of a=15⁰ and a=75⁰.

(2) Repeat Prob.(7), if the load is highly inductive load.

(3) A three-phase, half-wave controlled rectifier is fed from 380-V, 50-Hz ac supply. The load is a highly inductive load of R=10W and the triggering angle is 30⁰.

     (i) Draw the waveforms of the load voltage and thyristor voltage.

     (ii) Compute the load power and the supply power factor

     (iii) Determine the rating of the thyristor.

(4) A three-phase, fully controlled bridge rectifiers feeds a resistive load of R=10W from a 380-V, 50-Hz ac supply. Find the average values of the load voltage and load current at triggering angles of a=15⁰ and a=75⁰.

(5) Repeat Prob.(4), if the load is highly inductive load.

(6) A three-phase, fully controlled bridge rectifiers is fed from 380-V, 50-Hz ac supply. The load is a highly inductive load of R=10W and the triggering angle is 60⁰.

     (i) Draw the waveforms of the load voltage and thyristor voltage.

     (ii) Compute the load power and the supply power factor

     (iii) Determine the rating of the thyristor.

(7) A 40-kW, 200-V, permanent-magnet has an armature-circuit resistance of 0.097W. The motor is fed from a single phase, fully-controlled rectifier bridge and the ac supply is 240-V, 60-Hz. If the efficiency of the motor at rated conditions is 96.7%.

     (i) Find the triggering angle.

     (ii) The motor speed if the motor constant is kf=1.15 V. s /rad.