Electromagnetic time reversal : application to electromagnetic compatibility and power systems

✍ Scribed by Paolone, Mario; Rachidi, Farhad; Rubinstein, Marcos

• Publisher: John Wiley & Sons
• Year: 2017
• Tongue: English
• Leaves: 290
• Category: Library

✦ Synopsis

"This book is intended to give the theoretical foundation of the electromagnetic time reversal theory. Special emphasis is given on real applications in the fields of EMC and power systems"--

Abstract:

The aim of this book is to familiarize the reader with the concept of electromagnetic time reversal, and introduce up-to-date applications of the concept found in the areas of electromagnetic compatibility and power systems. Read more...

The basic idea of the EMTR is to take advantage of the re-
versibility in time of the wave equation. The transients observed
in specific observation points of the system are time-reversed
and transmitted back into the system. The time-reversed signals
are shown to converge to the source (fault) location. The EMTR
presents several advantages.

Typical methods used these days are based on
the estimation of the postfault impedance observed in measurement points usually located in primary substations. With
the hypothesis of having a fully passive power system, such an es-
timation could provide useful information to locate the fault
when compared with the line impedance. However, the presence of other sources (e.g., associated with the increasing pen-etration of dispersed generation) can largely affect the accuracy of these procedures. For these reasons, procedures that belong to the second of the aforementioned categories may be less influenced by the presence of dispersed generation. This
is because postfault high-frequency electromagnetic transients
taking place within the first few milliseconds after the fault are
associated with the travelling waves originated by the fault it-
self. Therefore, these transients are not influenced by the industrial frequency power injections of distributed sources. The
major drawbacks of this second category of methods are: 1) they
require an assessment between the number of observation points
versus the number of possible multiple fault-location solutions
and 2) they require large bandwidth measuring systems.
Within this context and by referring to the second of the afore-
mentioned categories
, this paper aims at investigating the pos-
sibility of applying
the theory of time reversal to the problem
of fault location.
This method was developed
first in the
field of acoustics [15]
–[18] and was more recently applied to electromagnetics

✦ Table of Contents

Content: Time reversal: a different perspective --
Time-reversal in diffusive media --
From electromagnetic time reversal theoretical accuracy to practical robustness for EMC applications --
Amplification of electromagnetic waves using time reversal --
Application of time reversal to power line communications for the mitigation of electromagnetic radiation --
Application of electromagnetic time reversal to lightning location --
Electromagnetic time reversal applied to fault location in power networks.

✦ Subjects

Time reversal;Electromagnetism;Electromagnetic compatibility;Electric power systems;TECHNOLOGY & ENGINEERING / Mechanical; fault location in wired networks; matched-pulse reflectometry; decomposition of the time-reversal operator (DORT);