April 2020
Intermediate
296 pages
7h 37m
English
Content preview from Current Interruption Transients Calculation, 2nd Edition
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Preface to First Edition
After a fortunate and rewarding career that started at ASEA in Ludvika, Sweden and was followed by 28 years at BC Hydro in Vancouver, Canada, I took early retirement in May 2001. Not long afterwards, I was asked by the Association of Professional Engineers and Geoscientists of BC if I would be interested in presenting continuing professional development (CPD) courses on circuit breaker application and this started a second career in teaching.
The first course was four hours long and eventually grew into far more detailed courses, some up to five days’ duration. Experience with the courses showed that the part that generated the most questions from participants related to all types of current interruption transients and I started to consider developing a course on transients alone. Around about the same time, the engineering manager at one of my consulting clients lamented the fact that engineers today, particularly the younger generation of engineers, are much too dependent on software and have lost sight of theory and practical reality. He asked if a course could be developed to provide a fundamental understanding of transients and enable estimations using only a hand calculator and a spreadsheet program.
The approach taken (after a number of false starts) was to draw the circuit diagrams for all possible making, breaking, reignition, and restriking cases. Comparison showed that practically all cases are covered by four basic circuits (Tables 2.1
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