Protection of Industrial Power Systems

Protection of Industrial Power Systems

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The protection which is installed on an industrial power system is likely to be subjected to more difficult conditions than the protection on any other kind of power system. Starting with the many simple devices which are employed and covering the whole area of industrial power system protection, this book aims to help achieve a thorough understanding of the protection necessary. Vital aspects such as the modern cartridge fuse, types of relays, and the role of the current transformer are covered and the widely used inverse definite-minimum time overcurrent relay, the theory of the Merz-Price protection system and the development of the high-impedance relay system are critically examined. This new edition has come about in response to the dramatic change from the use of electro-magnetic relays to electronic and micro-processor relays which figure in practically all new installations. Therefore, although the theory and usage are the same, the application can be much improved owing to the increased range and accuracy and the added facilities provided with the modern relays. This book reflects the change and explains the technical advantages.Possibly the simplest of all schemes is the direct-acting trip where the actual fault current is used by passing it through one or two turns to provide a magnetic ... The adjustment is typically over a range of 5 to 10 times the circuit-breaker rated current. ... Figure 1.1 shows a typical low voltage distribution circuit and Fig. ... The full lines are the characteristic curves, the dotted lines the maximum tolerances.

Title:Protection of Industrial Power Systems
Author:T. DAVIES
Publisher:Butterworth-Heinemann - 1996-12-11


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