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Computationally efficient methodology for analysis of faulted power systems with series-compensated transmission lines: a phase coordinate approach

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Title Computationally efficient methodology for analysis of faulted power systems with series-compensated transmission lines: a phase coordinate approach
 
Creator GAJBHIYE, RK
GOPI, B
KULKARNI, P
SOMAN, SA
 
Subject electric lines
computational efficiency
electric fault currents
electric power system protection
electric relays
equivalent circuits
overvoltage protection
varistors
 
Description A capacitor in series with a transmission line is protected from overvoltage due to a large fault current by a nonlinear metal-oxide varistor (MOV) connected in parallel. Fault analysis, as well as the evaluation of performance of the transmission protection system, in the presence of MOV action becomes complex because 1) v-i characteristics of the MOV are nonlinear; 2) unsymmetrical MOV action for unsymmetrical faults will introduce coupling in sequence networks; and 3) MOV action will influence voltage or current inversion phenomenon. This paper presents a computationally efficient and simple methodology for fault analysis wherein the linear part of the network is modeled by an equivalent multiport Thevenin network. The proposed approach handles nonlinearity in fault analysis efficiently. It also provides an elegant approach to model unbalance in a network due to MOV action. The proposed approach can be used to determine relays prone to voltage or current inversion. Results on a real-life 716-bus Indian system illustrate the efficiency of the proposed approach.
 
Publisher IEEE
 
Date 2008-12-01T09:49:16Z
2011-11-25T16:14:17Z
2011-12-26T13:05:24Z
2011-12-27T05:52:15Z
2008-12-01T09:49:16Z
2011-11-25T16:14:17Z
2011-12-26T13:05:24Z
2011-12-27T05:52:15Z
2008
 
Type Article
 
Identifier IEEE Transactions on Power Delivery 23(2), 873-80
0885-8977
http://dx.doi.org/10.1109/TPWRD.2007.915966
http://hdl.handle.net/10054/212
http://dspace.library.iitb.ac.in/xmlui/handle/10054/212
 
Language en_US