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ELEC 4302

Contents. IntroductionFunctions of Equipment ProtectionFunctions of Protective RelaysRequired Information for Protective SettingProtection Settings ProcessFunctional Elements of Protective RelaysOperating Characteristics of Protective RelaysOvercurrent and Directional Protectio

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ELEC 4302

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    1. ELEC 4302/7311 Power System Protection: Protection settings Dr. Ramesh Bansal School of Information Technology and Electrical Engineering, Axon Bldg, 47/212 The University of Queensland, St Lucia, 4072 Australia bansal@itee.uq.edu.au Ph: +61 (07)33653394 Fax: +61 (07) 336 54999 1

    2. Contents Introduction Functions of Equipment Protection Functions of Protective Relays Required Information for Protective Setting Protection Settings Process Functional Elements of Protective Relays Operating Characteristics of Protective Relays Overcurrent and Directional Protection Elements Distance Protection Function 2

    3. Protection Settings: Introduction A power system is composed of a number of sections (equipment) such as generator, transformer, bus bar and transmission line. These sections are protected by protective relaying systems comprising of instrument transformers (ITs), protective relays, circuit breakers (CBs) and communication equipment. In case of a fault occurring on a section, its associated protective relays should detect the fault and issue trip signals to open their associated CBs to isolate the faulted section from the rest of the power system, in order to avoid further damage to the power system. 3

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