Professor of Electrical Power Engineering – Cairo University
Objective :
To know the basic requirements of protective relays and the different types of faults in the electrical network
To know the different types of relays and principles of operation of each type
To learn how to protect the generators, transformers , feeders , bus-bars ,motors and distribution circuits
To know what is the primary and secondary protection
Contents :
Protective relay fundamentals : Different types of faults, The main idea of relays operation, The basic requirements of protective relays, Classification of relays according to their function of operation, Classification of relays according to their time of operation, Classification of relays according to their construction, Current transformers, Potential transformers
Types of relays : Electromagnetic relays, Static or electronic relays, Digital relays, Differential relays, Over current relays, Distance relays-Impedance relays, admittance relays and reactance relays, Earth leakage relays, Buchholz relay, Directional relays
Generator Protection : Faults in the windings protection, Loss of excitation protection, Motoring of generators protection, Overload protection, Overheating protection, Over speed protection, Unbalanced operation protection, Out of synchronization protection, External faults protection
Transformer Protection : Earth fault on a transformer winding protection, Core faults due to insulation breakdown which sufficient eddy current to flow causing over heating protection, Inter-turn faults occur due to winding flashover caused by line surges. Protection, Phase to phase faults protection, Tank faults due to loss of oil which produces abnormal temperature rises protection
Bus –bar Protection : Bus-bar Protection Techniques, Interlocking Schemes, Over-current Differential, Percent Differential, Feeder and distribution network protection,
