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TELEPHONE INFLUENCE FACTOR (TIF) - The telephone influence factor of a synchronous generator is a
measure of the possible effect of harmonics in the generator voltage wave on telephone circuits. TIF is measured
at the generator terminals on open circuit at rated voltage and frequency.
THREE PHASE - Three complete voltage/current sine waves, each of 360 electrical degrees in length, occurring
120 degrees apart. A three phase system may be either 3 wire or 4 wire ( 3 wires and a neutral).
UNINTERRUPTABLE POWER SUPPLY (UPS) - A system designed to provide power
without delay or transients, during any period when the normal power supply is incapable of performing
acceptably.
UNITY POWER FACTOR - A load whose power factor is 1.0 has no reactance's causing the voltage wave to lag
or lead the current wave.
WATT - Unit of electrical power. In DC, it equals the volts times amperes. In AC, it equals the effective volts
times the effective amps times power factor times a constant dependent on the number of phases.