Electrical Power Systems Technology

486 Electrical Power Systems Technology

torque 353
total power (PT) 56
transformer 214-222, 225
transmission lines 208, 210
transmission path 19, 21
triac 461, 463, 464, 466, 467
trigonometric ratios 50
trigonometry 471
true power 49, 50

U
uninterruptible power supply
(UPS) 253
units of measurement 6
unity 69
universal motors 368, 399
uranium-235 109, 1 10

V
vapor lighting 334
vectors 40, 42, 43
vector diagram 40, 41
visible light 328, 330
volt-amperes reactive (vars) 50

volt-ohm-milliammeter (vom) 60

voltage drop 270, 272, 274, 275,

277, 282, 283

voltage regulation 154, 199, 200

voltage regulators 202, 243

voltage variation 397

W

watt 28

watt-hour meter 66, 68

watt-second 28

wattmeter 66

Wheatstone bridge 62, 63

wind systems 118, 124, 125

work 22, 23

wound-rotor induction motor 391

wye 55

configuration 53, 150

delta starting 437

system 54, 56, 57, 263, 302, 303,

304

Z

zener diodes 200