A fully controlled three-phase rectifier bridge circuit supplies a dc load of 300V,60A, from 415V 3-phase ac supply via delta-star transformer. (i) Determine the required thyristor and transformer specifications. (ii) Draw the load and thyristor voltages when firing angle alpha = 60°. (ii) If a commutating diode is placed across the load, determine the FWD specification and then calculate the average load voltage and FWD average current when firing angle alpha = 45° A fully controlled three-phase rectifier bridge circuit supplies a dc load of 300V,60A, from 415V3-phase ac supply via a delta-star transformer.(i)Determine the required thyristor and transformer specifications.(ii)Draw the load and thyristor voltages when firing angle a = 60°.(ii)If a commutating diode is placed across the load, determine the FWD specification andthen calculate the average load voltage and FWD average current when firing anglea = 45° .3 4 5L2VaicL3Ic46 A 2

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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A fully controlled three-phase rectifier bridge circuit supplies a dc load of 300V,60A, from 415V 3-phase ac supply via delta-star transformer. (i) Determine the required thyristor and transformer specifications. (ii) Draw the load and thyristor voltages when firing angle alpha = 60°. (ii) If a commutating diode is placed across the load, determine the FWD specification and then calculate the average load voltage and FWD average current when firing angle alpha = 45°

A fully controlled three-phase rectifier bridge circuit supplies a dc load of 300V,60A, from 415V
3-phase ac supply via a delta-star transformer.
(i)
Determine the required thyristor and transformer specifications.
(ii)
Draw the load and thyristor voltages when firing angle a = 60°.
(ii)
If a commutating diode is placed across the load, determine the FWD specification and
then calculate the average load voltage and FWD average current when firing angle
a = 45° .
3 4 5
L2
Va
ic
L3
Ic
4
6 A 2

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