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dc.contributor.authorTamronglak, Suracheten_US
dc.date.accessioned2014-03-14T21:17:40Z
dc.date.available2014-03-14T21:17:40Z
dc.date.issued1994en_US
dc.identifier.otheretd-08142006-110054en_US
dc.identifier.urihttp://hdl.handle.net/10919/39136
dc.description.abstractThis research analyzes the linkage between power system disturbances and failures in relaying systems. The annual disturbance reports prepared by the North American Electric Reliability Council were examined. It has been found that relaying system failures plays very important role in power system cascading outages. The type of relaying system failures that are the most troublesome are the ones that have a potential to remain hidden until being exposed by some abnormal power system states to trigger relay misoperations. Each commonly used relaying scheme in transmission system is examined for any hidden failures that can lead to relay misoperations and multiple power system contingencies. Each hidden failure mode has a region, called region of vulnerability. Inside this region, some abnormal power system states can expose the hidden failure. The reach of the region depends largely on the settings of the relay in question. A method of computing the relative importance of each region of vulnerability, called vulnerability index, was proposed. The calculation of the index can be based on some measurements of power system performances. In this research, the stability measurements of the system following some contingencies that may occur in the region are chosen. With this approach, vulnerable relays can be identified. A preventive method was proposed so that the number of relay misoperations due to hidden failures and, ultimately, the number of power system disturbances can be reduced.en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1994.T367.pdfen_US
dc.subjectElectric power failures.en_US
dc.subjectElectric relays.en_US
dc.subjectElectric power system stability.en_US
dc.subject.lccLD5655.V856 1994.T367en_US
dc.titleAnalysis of power system disturbances due to relay hidden failuresen_US
dc.typeDissertationen_US
dc.contributor.departmentElectrical Engineeringen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairPhadke, Arun G.en_US
dc.contributor.committeememberJohnson, Lee W.en_US
dc.contributor.committeememberBroadwater, Robert P.en_US
dc.contributor.committeememberDe La Ree Lopez, Jaimeen_US
dc.contributor.committeememberLiu, Yiluen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08142006-110054/en_US
dc.date.sdate2006-08-14en_US
dc.date.rdate2006-08-14
dc.date.adate2006-08-14en_US


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