M.E.
El-Hawary,
Editor
r
Engineering Letters
ower Engineering Letters is a new section
of
IEEE Power Engi-
neering Review, running for the first time in the January 1998 is-
sue This section of the magazine offers
a
vehicle that will speed
publication of new results, discoveries, and developments. The section
affords authors the opportunity to publish contributions within
a
few
months
of
submission to ensure rapid dissemination of ideas and timely
archiving of developments in
our
rapidly changing field.
Original and significant contributions in applications, case studies,
and research in all fields of power engineering are invited. Of specific
interest are contributions defining emerging problems and special
needs in specific areas Brief notes may also comment
on
published
ar-
eas of established power topics.
his
issue
includes the following Power Engineermg Letters.
A Novel Approach for Fault Location
on
Transmission Lines, by
M M Tawfik, M M Morcos
Joint Energy and Reserve Dispatch
in
a
Competitive Pool using
Lagrangian Relaxation, by A G. Bakirtzis
Wavelet Transform and Neural Network Approach
to
Developing
Adaptive Single-Pole Auto-Reclosing Schemes for EHV Trans-
mission Systems, by I.K. Yu, Y.H Song
Submit contributions, criticism, and queries to the Power Engmeer-
ing Letters editor.
Dr.
Mohamed E. El-Hawary, DalTech, Dalhousie
University,
P.O.
Box 1000, Halifax, NS B3J 2x4, Canada, (902) 494-
6198 or (902) 494-6199, FAX (902) 429-3011, E-mail elha-
wary@dal ca.
The editorial board
for Power Engineering Letters
is
responsible
for the peer review of
all
Letters appearing in this section. Editonal
board members include.
M.E. El-Hawary (editor), Faculty of Engineering, DalTech,
Dal-
housie University, Halifax, NS, Canada
Maria Teresa Correia de Barros, Universidade Tecnica de Lisboa,
Portugal
Albert M. DiCaprio, PJM Interconnection, Norristown,
PA,
U.S.A.
R.K. Green, Jr., Central and Southwest Services, Dallas,
TX,
US
A
T.J. Hammons, University
of
Glasgow, Glasgow, Scotland, UK
Shin-Ichi Iwamoto, Waseda University, Tokyo, Japan
J
H
Jones, Southem Companies Services, Birmingham, Ala-
bama, U
S.A
Prabha Kundur, Power Tech Labs, Surrey, BC, Canada
Fred N Lee, University of Oklahooma, Norman, OK, U.S.A.
Peter McLaren, University of Manitoba, Winnipeg, Manitoba,
Canada
James Momoh, Howard University, Washington DC, U S.A.
Alexander Papalexopoulos, Pacific Gas and Electric,
San
Fran-
sisco, CA, U.S.A.
Michel Poloujadoff, Universite Pierre et Marie Curie,
Pans,
France
Narayan Rau,
IS0
New England Inc., Holyoke, MA U.S.A.
A. Schwab, Universitat Karlsruhe, Karlsruhe, Germany
Walter L Snyder, Jr., Siemens Energy
&
Automation, Inc.
Brooklyn Park, MN, U.S
A.
J.S.
Thorp, Come11 University, Ithaca, New York, U.S.A.
S.S.
Venkata, Iowa State University, Ames, IA, U
S
A.
Bruce
E
Wollenberg, University of Minnesota, Mmneapolis,
MN, U
S
A.
A
Novel
Approach
for
Fault
Location
on
Transmission
Lines
M.M.
Tawfik,
M.M.
Morcos
Author Affiliation:
Department of Electrical and Comput
neering, Kansas State University, Manhattan,
KS
66506
Abstract:
A new approach for fault locating is investigated. The
fault locator estimation is based
on
the noise generated by the fault in
the sending-end current signal. The proposed scheme consists of a
wavelet-based filter module,
a
Prony-based signal processor, and an
ANN-based estimator Input data has been generated using the Altema-
tive Transient Program (ATP).
A
three-phase, frequency-dependent
(FD) transmission line model was used. The scheme is tested using data
employed in the ANN training
as
well as new data sets. The proposed
locator has a good level of accuracy.
Keywords:
fault locator, artificial neural network, back-
propagation, Prony fitting, wavelet
Introduction:
Recent reformation in the power industry such as
open access
and
deregulation may have an impact
on
the reliability and
security of power systems. New methodologies for various protection
and control schemes are a must to maintain system reliability and secu-
rity within an accepted level. Artificial intelligence (AI) techniques are
among the top candidates to realize this new methodology.
on
the fundamental component of current and/or voltage. They usually
require either prefault measurements or remote-end measurements.
These measurements sometimes add technical complexity to the
scheme or even introduce an error component to the estimation if not
processed properly.
The use of the fault-generated noise has been introduced
as
a fault
detection tool
on
extra high voltage (EHV) lmes
[
11.
The results were
very encouraging to extend their use to fault location. This noise is sim-
ply the distortion in the voltage and current waveforms due to the trav-
eling wave moving over the line between the fault location and the
sending end.
;
,
\
\
Most present fault locators estimate the location of the fault based
"
I
I
Figure
1.
Waveforms
for
different
fault
locutions
IEEE
Power Enganeenng Revaew, November
1998
1
58
