Answered: Three phase Bridge rectifier operated…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Three phase Bridge rectifier operated from a 380V, 50Hz source throughout three-phase Y/Y connected transformer with ration 2:1. The load current has continuous character with negligible ripples and average thyristor current of 15A. The circuit inductance per phase is 1.2mH. The rectified voltage due to overlapping angle is 90 % of that voltage when this angle is neglected.

1- How much will the voltage drop be due to circuit inductance *

2- How much will the dc average voltage Vdc(alpha) be.

3- How much will the firing angle be ?

4- The overlapping angle.

5- How much is the percentage change of the output dc power if the thyristors T2, T4 and T6 are replaced by three diodes D2, D4, D6.

6- How much will be the maximum RMS phase current for the mentioned in previous task circuit ( semi-converter).

7- If an additional of 1 mH inductances are added to the existing inductances in the phases , how much will the overlapping angle be. The dc load current is kept constant & the circuit is semi-controlled rectifier..

Three phase Bridge rectifier operated from a 380V, 50HZ source throughout three-phase Y/Y connected
transformer with ration 2:1. The load current has continuous character with negligible ripples and
average thyristor current of 15A. The circuit inductance per phase is 1.2mH. The rectified voltage due to
overlapping angle is 90 % of that voltage when this angle is neglected.

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