Protective Relaying Theory and ApplicationsWalter A. Elmore ABB, 1994 - 367 sayfa This work thoroughly updates Applied Protective Relaying, developed and edited by J. Lewis Blackburn. It describes the fundamental concepts of relaying in easy-to-understand terms, and details the applications of protective relays for the detection of faults in electrical apparatus. It also describes other types of relaying such as reclosing, monitoring and load shedding. Fault detection or decision units are examined. |
İçindekiler
Introduction and General Philosophies | 1 |
Comparison of Symbols | 8 |
Basic Relay Units | 39 |
Telif Hakkı | |
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amperes angle autotransformer auxiliary Balance Point breaker-failure capacitor characteristic circuit breakers coil condition connected coordination ct's current flows current transformer curve delta detection devices differential relay directional distance relay energized Equation external fault factor fault current feeder frequency ground fault ground relay input inrush inrush current instantaneous K₁ KDAR linear coupler machine maximum microprocessor minimum motor negative sequence neutral normal out-of-step output overcurrent relays overload overvoltage phase comparator phase faults phase-to-phase phasor pickup polarizing positive sequence power system primary protective relays R-X diagram ratio reactance reactor reclosing reclosure relay operation remote resistance resistor restraint rotor S₁ S₂ saturation scheme secondary sensitivity sequence network sequence voltage shown in Figure source impedance Switch SYMMETRICAL FAULT synchronism terminal three-phase fault timer torque transformer bank transient trip typical unit voltage transformer Volts winding zero sequence current zone ZR₁