<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mohamed F. Abdel-Fattah</style></author><author><style face="normal" font="default" size="100%">Matti Lehtonen</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A New Transient Current Based Centralized Selectivity Algorithm for Earth Faults in Isolated and Compensated Neutral MV Networks</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the 44th International Universities Power Engineering Conference</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Power System Protection 3</style></keyword><keyword><style  face="normal" font="default" size="100%">Power System Simulation and Analysis</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2009</style></year><pub-dates><date><style  face="normal" font="default" size="100%">September</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%"></style></number><edition><style face="normal" font="default" size="100%"></style></edition><publisher><style face="normal" font="default" size="100%"></style></publisher><pub-location><style face="normal" font="default" size="100%">University of Strathclyde</style></pub-location><volume><style face="normal" font="default" size="100%"></style></volume><pages><style face="normal" font="default" size="100%"></style></pages><isbn><style face="normal" font="default" size="100%"></style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">This paper presents a new centralized selectivity algorithm for earth faults in isolated and compensated neutral medium voltage (MV) networks. The proposed algorithm is based on investigations on the flow of the transient fault currents in the network during the earth fault. The fault current is composed of the currents flowing through the earth capacitances, and return through the windings of the substation transformer, which highlights the strong relation between these currents. The algorithm proposes to determine and utilize the relation between the transient phase current changes (superimposed components) in the substation transformer and the transient residual currents for each feeder and section of the network (centralized approach). The fault indicators will measure the transient RMS values of the residual currents, in a verified constant sliding window of 2.5 ms, using a sampling frequency of 25 kHz, at each feeder and section in the network. The fault relation factors will be calculated, considering availability of a suitable centralized communication link with the substation transformer transient phase current changes. The fault indicator will be activated for higher fault relation factors; around 100%. The faulted feeder can be detected easily and the faulted section can be selected precisely by following the active fault indicators, without voltage measurements. The proposed algorithm is valid for both of isolated and compensated networks. It is less dependent on the fault resistance and the faulted feeder parameters. A 20 kV, 251 km MV distribution network is simulated by ATP/EMTP program. Extensive simulations are performed to validate and realize the algorithm.</style></abstract><issue><style face="normal" font="default" size="100%"></style></issue><work-type><style face="normal" font="default" size="100%"></style></work-type><accession-num><style face="normal" font="default" size="100%"></style></accession-num><call-num><style face="normal" font="default" size="100%"></style></call-num><notes><style face="normal" font="default" size="100%"></style></notes><custom1><style face="normal" font="default" size="100%"></style></custom1><custom2><style face="normal" font="default" size="100%"></style></custom2><custom3><style face="normal" font="default" size="100%"></style></custom3><custom4><style face="normal" font="default" size="100%"></style></custom4><custom5><style face="normal" font="default" size="100%"></style></custom5><custom6><style face="normal" font="default" size="100%"></style></custom6><custom7><style face="normal" font="default" size="100%"></style></custom7><research-notes><style face="normal" font="default" size="100%"></style></research-notes><num-vols><style face="normal" font="default" size="100%"></style></num-vols><orig-pub><style face="normal" font="default" size="100%"></style></orig-pub><reprint-edition><style face="normal" font="default" size="100%"></style></reprint-edition><section><style face="normal" font="default" size="100%"></style></section><auth-address><style face="normal" font="default" size="100%"></style></auth-address><remote-database-name><style face="normal" font="default" size="100%"></style></remote-database-name><remote-database-provider><style face="normal" font="default" size="100%"></style></remote-database-provider><label><style face="normal" font="default" size="100%"></style></label><access-date><style face="normal" font="default" size="100%"></style></access-date></record></records></xml>
