Slow Contact Opening Circuit Breakers

By Kesorn Pechrach

New results in this book show that at the point at which the arc root moves from the contact region, the driven flow could dominate the arc root commutation from the contact region. The arc root contact time analysis and modelling of the magnetic forces lead to able to estimate the minimum forces that moved the arc root from the contact region. The minimum force for the arc to move from the contact region, with contact opening velocities between 1 m/s and 10 m/s, was approximately 0.2 N. The short circuit current showed a significant influence on the movement of the arc root and the magnetic forces on the contact area and the arc root contact time is decreased as the contact gap increases for contact velocities below 2.2 m/s. The contact opening velocity has a significant influence on the mobility of the arc root from the contact region. The arc root motion depended upon the quantity of the flow and area of the arc chamber venting.

• Language: English
• Publisher: Pechrach Publishing
• Release date: Jul 12, 2019
• ISBN: 9781393808381

Book preview

Dr. Kesorn Pechrach

Slow Contact

Opening

Circuit Breakers

Dr. Kesorn Pechrach

Pechrach Publishing

England

Slow Contact Opening Circuit Breakers 

By Dr Kesorn Pechrach

ISBN 978-0-9931178-6-2

Pechrach Publishing

7 Boundary Road, Bishops Stortford, Hertfordshire, CM23 5LE, England, United Kingdom. Tel: [phone]

Published 2015 by Pechrach Publishing

Copyright © 2015 Kesorn Pechrach and Pechrach Publishing

The right of Kesorn Pechach to be identified as the author of this work has been asserted in accordance with section 77 and 78 of the Copy right, Designs and Patents Act 1988

All right reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of the publishers.

Every reasonable attempt has been made to identify owners of copyright. Errors or omissions will be corrected in subsequent edition. Although the authors and publisher have made every effort to ensure that the information in this bookwas correct at the time of going to press, the authors and publisher do not assume and hereby disclaim any liability to any party for any loss, damage, or disruption caused by errors or omissions.

This book is dedicated to my sister,

Somjan Pechrach.

Acknowledgments

I would like to thank my beautiful son, Neran J. Pechrach Weaver and my amazing husband, Dr. P. M. Weaver for enthusiasm advice, suggestion and non-stop supporter while I was writing this book. 

Many Thanks to my awesome family in Thailand for their continuous support, understanding and encouragement.

I would like to thank Prof. J.W. McBride for showing me a new way of life.

My best friends P.G. Wheeler and P.W. Wilkes for their cheerfully supply all manufacturing mechanical and electrical parts for experiments.

Thanks to Dr. J. Swingler, Prof. N. Ben Jemaa, Prof. Sawa and Prof. Suleiman M Sharkh for their suggestion and recommendations throughout this work

Finally, I would like to thanks my support and backup team: Rajiya Sultana, Anna Wlodarczyk and Kanae Jinkerson.

Table of Contents

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