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Al-Ameeria Integrated Technical Education
Cluster
BTEC Higher National Diploma in
Electrical & Electronic Engineering
2nd
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.