IEEE Power & Energy Magazine - September/October 2015 - 89

book reviews

two worth reading
protective relaying and electric safety

W

WITH THIS ISSUE, WE HAVE TWO
books reviewed, Protective Relaying:
Principles and Applications and Electric
Safety: Practice and Standards. Protective
Relaying is in its fourth edition, and this
volume builds upon the earlier editions by
adding in new technology. Electric Safety
covers many levels and facets of electrical safety. Both books, according to their
reviewers, are valuable references.

Protective Relaying:
Principles and
Applications
By J. Lewis Blackburn and Thomas J.
Domin, 2014, ISBN-13: 9781439888117.
The fourth edition of Protective Relaying: Principles and Applications by
J. Lewis Blackburn is now available,
having been edited and enhanced by
Thomas J. Domin since the second edition. This book is applicable as a college textbook and as a reference book
for protection engineers new to the
industry (as an instructional text) and
those with experience (as a reference
text). This fourth edition has built upon
the earlier editions, adding the new
technology of the digital protective
relays, automation, event analysis, and
regulatory issues. This book is based
on the principles and applications typical in the United States.
Protective Relaying: Principles and
Applications begins with an introduction of the need for protective relaying
as well as a history. And while microprocessors and the digital age is all enDigital Object Identifier 10.1109/MPE.2015.2431217
Date of publication: 18 August 2015

september/october 2015

compassing, it is good to know where
protective relaying got its beginning.
The original technology of electro-mechanical relay is the basis of much of
the 21st century's algorithms used in microprocessor-based relays.
Unfortunately, through
the several editions, the
photo resolutions have
been lost; therefore, some
of the details have been
lost. The newer photographs used in recent editions do not suffer the
same issue.
After the introduction of the applications
of per unit as well as
phasors and polarity, the derivation and
application of symmetrical components
are presented. While there are many
computer-based programs that model the
power system and calculate the necessary
symmetrical components, this provides
a basis for the student to understand the
outputs of such modeling programs. This
is the language of the relay engineer or
technician. Practical examples are provided for the practice of the use of symmetrical components so the student can
become proficient in fault analysis and
event analysis.
The current and voltage inputs available to relaying are also discussed in the
early part of the book. The understanding of the steady-state and transient
performances of the current transformers, voltage transformers, and the coupling capacitive voltage transformers

are necessary to understand the proper
and improper operations of protective
relays. There is a short introduction
included on optical sensing devices as
well as other unconventional devices that
are becoming more
available today.
Following the introductory chapters are the
fundamental principles
of protection. The most
fundamental of these are
introduced first, the differential protection principle. This protection
is based on the fact that
current flow into a node
must equal the current
flowing out of a node.
Following this is the
overcurrent, directional, and impedancebased protection. System grounding principles are then summarized to allow for
understanding of the best practices for protection of each type of system.
Chapters 8-13 describe the individual component protection of the power
system. The protection of generators,
including the protection of distributed
generation, is first. Distributed generation is becoming more applicable today
with smaller generators in diverse locations, increasing the need for specialized
protection for the interties these systems.
These distinctly different generators are
compared and contrasted as to the protection needs. Details are provided on
protection for generator motoring, overexcitation, inadvertent energization, overvoltage, overcurrent, loss of synchronism,
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