0ROTECTIONOF%LECTRICITY $ISTRIBUTION.ETWORKS BY Alanna Stang Christopher Hawthorne
The quality of electricity supplies is an important factor in the socio-economic development of any area. Approximately 75 per cent of all customer hours lost are owing to faults on the distribution networks, and customers rightly expect a high level of security for their supply. Although this can be achieved by good distribution network design using proven equipment, it is also essential to provide suitable protection schemes and relay settings to ensure that faults are quickly disconnected to minimise outage times and improve the continuity of supplies to customers.
With this in mind this book has been produced as a reference guide for professional engineers and students. It is hoped that the many detailed examples and exercises throughout the book, which the authors have taken from actual case studies in the field, will provide worthwhile material for planning and design engineers and maintenance staff, particularly those engaged in the co-ordination and setting of protection on distribution systems.
The book is based on original material by Mr Gers and translated from the Spanish by Mr Holmes. Subsequently the authors have expanded the text considerably and added much up to date material. It is our view that in the process the continuous dialogue between the co-authors from differing backgrounds and experiences has led to a deeper exploration of the subject matter.
Thanks are due to the University of Valle and the Colombian Institute of Sciences (COLCIENCIAS) for financial help; The British Council for continuing support during many years of institutional exchange; C. Delgado for his valuable comments on the initial manuscripts and our colleagues at GERS Ltd. for their ideas and assistance; F. Pacheco in producing the diagrams; Professor K.L. Lo at Strathclyde University for his guidance, and Stephen and Philip Holmes for sharing so generously their computer expertise. In addition, the authors have been most grateful for the help received from many sources and the permission, readily given, by various organisations to include copyright material which is acknowledged in the text. Finally, we wish to acknowledge the considerable support and understanding that we have received from our wives Pilar and Maggie throughout the four years of work on this book.
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