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Page 393

| portable, 40 |

| primary, 14-15, 22 |

| principal parts, 22 |

| ratings, 19 |

| ratio of transformation, 14-15, 88-92, 98, 112-13 |

| regulation, 18 |

| secondary, 14-15, 22 |

| self protected, 50-56 |

| single phase, 71-73, 108 |

| SL, 99-100 |

| step down, 3, 5, 16, 89 |

| step up, 3, 5, 16, 89 |

| street lighting, 95-100 |

| constant current, 95-97 |

| IL and SL, 99-100 |

| substation, 39, 49, 59, 112, 119 |

| subway type, 47, 49 |

| tank, 29-32 |

| radiator, 32 |

| tap, 37, 60, 84, 92, 94, 99, 115 |

| tap changing, 37, 60, 93, 99, 113, 115 |

| temperature, 19 |

| terminal, 34-36 |

| troubleshooting, 122-24 |

| turns, 14-15 (see also Coil, Windings) |

| types, 23-28 |

| core, 23-24, 26-28 |

| shell, 23-24, 26-28 |

| spiral wound, 25 |

| vibration, 25 |

| welding, 103 |

| winding, 14, 22, 26 (see also Coil; Turns) |

| X-ray, 103 |

| Transient condition, 230 |

| Transmission, 266-67 |

| Trip-free feature, circuit breaker, 158-59 |

| Tripping, capacitor, 253 |

| Troubles, troubleshooting: |

| capacitors, 325 |

| circuit breakers, 174-76 |

| cut outs, 216 |

| disconnecting devices, 197 |

| fuses, 216 |

| lightning or surge arresters, 233 |

| protective relays, 279-80 |

| reactors, 325 |

| rectifiers, 325-26 |

| storage batteries, 301-2 |

| surge or lightning arrester, 233 |

| transformers, 122-24 |

| Turns, 14-15, 26, 78 |

| Turns ratio, 14-15, 88-90, 92, 98, 112-13 |

| V |

| Vacuum, 135 |

| circuit breaker, 135 |

| tube, 103 |

| Valve, 20, 66 |

| Vandalism, 29, 58 |

| Varmeter, 334-35 |

| Vaults, 34, 47-48 |

| Vent, 34, 48 |

| Ventilation, 34, 47-48, 53, 56, 64-65, 103 |

| Vent-volume ratio, 48 |

| Vibration, 25 |

| Viscosity, 60 |

| Volt, 5 |

| Voltage, 3-19, 26, 34-37, 61-67, 70-78, 81-83, 86, 90-104, 108-9, 118 |

| amplitude, 8 |

| induced, 8, 10, 14 |

| Voltage regulator, induction, 37-38, 91-93, 113-14 |

| step type (TCUL), 92-96 |

| Voltage wave, standard impulse, 119, 232 |

| Volt-ampere, 5, 19-20, 90 |

| Volt-ampere-hour reactive meter, 340, 347 |

| Voltmeter, 76, 96, 108, 110, 330, 333 |

| W |

| Water, 32 |

| condensation, 31, 59-60, 65 |

| Watt, 15 |

| Watthour demand meter, 340, 345 |

| Watthour meter, 96, 337-49 |

| A base, 342 |

| register, 343, 345, 348-49 |

| single phase, 343 |

| socket base, 347 |

| three phase, 343 |

| two phase, 346 |

| Wattmeter, 96, 333-36 |

| Wave, standard impulse, 119, 232 |

| front, 232 |

| tail, 232 |

| Wedge contacts, 139-41 |

| Welding, 53, 103 |

| autotransformer, 103 |

| Wheatstone Bridge, 358-59 |

| Wind, 12 |

| Windings, 23-28, 34, 37-40, 48, 59-62, 65, 113, 118, 120 (see also Coil; Turns) |

| auxiliary, 103 |

| concentric, 27 |

| pancake, 27 |

| Wire (see Conductor) |

| Wye connection, 74, 77-81 |

| delta, 78-80, 83 |

| open, 79 |

| two phase, 85-86 |

| wye, 80-81, 83 |

| X.. |

| X-ray equipment, 103 |

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