Industrial Power Systems Handbook

air circuit breakers amperes application approximately arrangement arresters autotransformer cable capacitors cent conductor connected current transformers curves cycle d-c component distribution system electric equipment fault current feeder circuit fuses ground-fault current higher voltage horsepower impedance induction motors industrial plants initial installed cost insulation interrupter switches interrupting rating kilovars kilowatt kva base kvar lighting lightning arresters line-to-ground line-to-line load load-center system load-center unit substation low-voltage machine magnitude maximum motor starter motor-starting National Electrical Code neutral normal ohms One-line diagram operating overcurrent overhead line overvoltages per-unit phase power factor power system primary voltage ratio reactance reactor relay resistance resistor secondary selective short short-circuit current short-circuit protection shown in Fig steam supply switchgear symmetrical synchronous motors system voltage Table three-phase time-current trans trip turbine utility voltage drop voltage rating voltage regulation voltage spread volts zero