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Page 389

| reactive volt-ampere meter, 334-35, 352 |

| recording meter, 345-46, 350-51 |

| registers, 343-45, 348-49 |

| transformers, 352, 354-56 |

| varmeter, 334-35 |

| voltmeter, 330, 334 |

| watthour meter, 337-39, 341-43 |

| wattmeter, 333-34, 346 |

| Wheatstone Bridge, 358-59 |

| Instrument transformers, 95-97, 278-79, 352 |

| Insulation, 12, 23, 26-31, 34-38, 40, 56-57, 59-60, 62-65, 120-21, 146, 228-32 |

| basic insulation level, 228-33 |

| breakdown, 38 |

| oil, 148 |

| oil impregnated paper, 149 |

| porcelain, 148 |

| Insulation coordination, 38, 150-51, 215, 228-33 |

| arresters, 228-33 |

| circuit breakers, 150-51 |

| fuses, 215 |

| Insulation resistance test, 120 |

| Interlocks, 34, 313 |

| Interrupting devices, 185-90 |

| air break switch, 185-87 |

| load break, 190 |

| Interrupting duty, 129-31 |

| circuit breaker, 129-31, 151 |

| fuse, 214 |

| Iron Clad battery, 290-91 |

| Iron core, 7, 17-18, 22 |

| Iron core reactor, 306 |

| Iron losses, 18-19, 29 (see also Losses) |

| J. |

| Jack, hydraulic, 3, 4 |

| Joint, 48 |

| Jumper, 189 |

| K |

| Keep Alive circuit, 315 |

| Kilo, 5 |

| Kilovolt, 5, 19 |

| Kilovolt-ampere (kVA), 5, 19, 90, 99 |

| L |

| Lag, 10, 82 |

| Lagging, 60 |

| Laminations (I, U, E, L), 23-25, 60 |

| Lamps, 101-2 |

| halogen, 101-2 |

| mercury, 101-2 |

| sodium, 101-2 |

| Lead cell battery, 284-300 (see also Battery) |

| Lightning, 20, 26, 38, 49-50, 53, 59, 118-19. (see also Arrester) |

| Lightning arrester, 151, 218-33 |

| autovalve, 221 |

| coordination, 228-33 |

| expulsion, 224-25 |

| function, 218 |

| granulon, 222-24 |

| ground, 226-27 |

| insulation, 227-28 |

| isolator, 222, 224 |

| location, 226 |

| operation, principle of, 219 |

| pellet, 219-20 |

| thyrite, 222-23 |

| troubleshooting, 233 |

| types, 219 |

| valve, 219 |

| Lift rod, circuit breaker, 147 |

| Lines of force, 8, 23 (see also Magnetic Field) |

| Link fuse, 205 |

| Liquid filles fuse, 206 |

| Load monitoring, transformer, 57-58 |

| Losses, 15-29, 113-15 |

| copper, 19, 29, 114-15 |

| eddy current, 113-15 |

| heat, 17, 114 |

| hysteresis, 22-23 |

| iron, 18-19, 22, 29, 113-14 |

| I2R, 18, 113-14 |

| no load, 18 |

| transformer, 15, 17, 114-15 |

| Low voltage network, 48-49 |

| Lugs, lifting, 40, 43-44, 47 |

| M.. |

| Magnet, 6-7, 17 |

| Magnetic field, 6-9, 11, 13-18, 22-23, 29, 108 |

| Magnetic flux, 6, 27 (see also Magnetic field) |

| Magnetic lines of force, 6, 7, 22 |

| Magnetism, 7 |

| Maintenance, transformer, 60-67 |

| Main transformer, 84 |

| Manhole, 47-48 |

| Maximeter, 347 |

| Megger, 62-65, 120, 357-58 |

| Megohm, 120-21 |

| Megohmmeter, 355 (see also Megger) |

| Mercury arc rectifier, 314-16 |

| Keep Alive circuit, 315 |

| maintenance, 324 |

| Mercury lamps, 101-2 |

| Metalclad switchgear, 152-53 |

| Meters (see Instruments) |

| Microwave relay, 272-73 |

| Module, circuit breaker, 136-37 |

| Moisture, 30-31, 34, 59-60, 62 |

| Motor starting, autotransformer, 102-3 |

| Motor type mechanism, circuit breaker, 161-62 |

| Moving contacts, circuit breaker, 147 |

| Multiple circuit, 97 |

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