NDLI: Parameter identification of unsymmetrical transmission lines using accurately re-synchronised fault records

Content Provider	IEEE Xplore Digital Library
Author	Schulze, R. Schegner, P. Stachel, P.
Copyright Year	2009
Description	Author affiliation: Institute of Electrical Power Systems and High Voltage Engineering, TU Dresden, 01062 Dresden, Germany (Schulze, R.; Schegner, P.; Stachel, P.)
Abstract	Today transmission lines are protected by installing protection relays at their terminating stations. If a fault appears, the protection relays of the faulty line as well as of adjacent lines react and record measurement data. Until today these records are often unexploited. The purpose of this work is to analyse these records with the goal to identify equipment parameters in particular to estimate parameters of unsymmetrical transmission lines by using time-varying phasors. Due to the characteristic of the assumed line model only synchronously sampled fault data of two terminating stations can be used for this type of identification. It is commonly assumed in the field of signal processing of disturbance records (e. g. calculation of fault distance with multi-terminal signals) to use synchronised relays as signal sources. In practise this is not always the case. GPS-synchronised fault data are a minority compared with unsynchronised. This paper presents a novel method for re-synchronising unsynchronised fault data with time differences up to seconds. The proposed re-synchronisation method is divided into two stages. The pre-synchronisation uses segment borders to synchronise disturbance records of similar sequences. The second stage precisely synchronises the fault data belonging to two sides of an overhead transmission line by taking into account the characteristics of a simple line model.
Starting Page	1
Ending Page	6
File Size	1163427
Page Count	6
File Format	PDF
ISBN	9781424442416
ISSN	19449925
DOI	10.1109/PES.2009.5275229
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Parameter estimation Transmission lines Protective relaying Power transmission lines Transmission line matrix methods Integrated circuit modeling Transmission line theory Power system modeling Power system protection Power system relaying re-synchronisation of fault records parameter identification transmission line model time-varying phasors
Content Type	Text
Resource Type	Article

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