NDLI: Mitigation of switching overvoltages in transmission lines via controlled switching

Content Provider	IEEE Xplore Digital Library
Author	Dantas, K. Fernandes, D. Neves, L.A. Souza, B.A. Fonseca, L.
Copyright Year	2008
Description	Author affiliation: Dept. of Electr. Eng., Fed. Univ. of Campina Grande, Campina Grande (Dantas, K.; Fernandes, D.; Neves, L.A.; Souza, B.A.)
Abstract	The goal of this work is to present a controlled switching strategy to reduce overvoltages due to transmission line closing and re-closing. Controlled closing and re-closing of transmission lines eliminates the need of pre-insertion resistors, reducing in this way the costs of transmission line circuit breakers. The switching strategy consists on finding a suitable circuit breaker making instant, i. e., the time in which the voltage across the circuit breaker contacts is zero and the time span between the closing instant of the first and the last pole is as small as possible, minimizing in this way, the effect of the electromagnetic coupling between transmission line phases. The method is based on a very simple zero crossing algorithm with constraints and is implemented in the Alternative Transients Program (ATP) using the MODELS language. Data from the North-Northeast Brazilian Power System Grid, planned to be in service by 2009, are used to produce a few case studies. Some line switching events are analyzed: line closing and re-closing taking into account trapped charges and shunt compensation effects. The controlled switching performance is compared to the pre-insertion resistorpsilas method. The simulations attest the efficiency of the method, limiting switching overvoltages to nearly 1.55 per unit for shunt compensated transmission lines. In addition, controlled switching provides an increase of power apparatus life time, improvement on power quality and possibly the elimination of impositions that makes prohibitive some switching operations.
Starting Page	1
Ending Page	8
File Size	2000932
Page Count	8
File Format	PDF
ISBN	9781424419050
ISSN	19325517
DOI	10.1109/PES.2008.4596806
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transmission lines Switches Control systems Switching circuits Surges Shunt (electrical) Object oriented modeling Electromagnetic Transients Switching Overvoltages Transmission Lines Controlled Switching
Content Type	Text
Resource Type	Article

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