The remaining chapters deal with the application of protective relays to each of the several elements that make up the electric power system. Although there is quite good agreement among protection engineers as to what constitutes the necessary protection and how to provide it, there are still many differences of opinion in certain areas. This book describes the general practice, giving the pros and cons where there are differences of opinion. Four standard-practice publications deal with the application of protective relays.1,2,3,4 Manufacturers’ publications are also available.5,6,20 Bibliographies of relaying literature prepared by an AIEE committee provide convenient reference to a wealth of information for more detailed study.7
Frequent reference will be made here to publications that have been found most informative.
The fact that this book recognizes differences of opinion should not be interpreted as
complete approval of the various parallel practices. Although it is recognized that there
may sometimes be special economic and technical considerations, nevertheless, much can still be done in the way of standardization
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