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Page 390

| N |

| Nameplate, 19-20, 40, 71, 111 |

| National Electric (Safety) Code, 53 |

| Network, 48-49 |

| protector, 48-49 |

| Networking of transformers, 19 |

| Neutral, 50, 53, 66, 73, 78, 80-81, 84 (see also Ground) |

| Nicad battery, 289, 293 (see also Battery, storage) |

| Nickel-iron alkaline cell, 284, 288 (see also Battery, Storage) |

| Nitrogen, 31 |

| Noise, 22-23, 25, 43, 59, 67 |

| No load losses, 18 |

| O |

| Ohm 11-12, 82-83 |

| Ohmmeter, 355 |

| Ohm's Law, 12, 108 |

| Oil, 29-37, 40, 48, 59-62, 121, 134-35, 148, 166-67 |

| dielectric strength, 148, 166-67 |

| leakage, 152 |

| maintenance, 166-67 |

| test, 61-62, 121 |

| throwing, 153 |

| Oil circuit breaker, 49, 134-35 |

| Oil conservator, 31-32 |

| Oil filled bushing, 149 |

| Oil filled reactor, 308 |

| Oil fuse, 206-7 |

| Oil fuse cut out, 49-50, 52 |

| Oil switch, 49 |

| Overcurrent relays, 238-44 |

| combination type, 243-44 |

| definite time, principle of, 239 |

| design and construction, 239-57 |

| electromechanical or plunger type, 239-41 |

| induction or disk type, 241-43 |

| instantaneous, principle of, 238 |

| inverse time type, principle of, 238-39 |

| Oxygen, 30 |

| P |

| Pad mounted transformer, 47, 51 |

| Pancake winding, 27 |

| Paper insulation, 35, 149 |

| Permanent magnet coil instrument, 329-30 |

| Petticoat, 35 |

| Phase, 19, 39, 73 |

| single, 19, 39, 70-73 |

| three, 19, 39, 73, 110-11 |

| two, 75, 85-86, 91 |

| Phase displacement, 74, 82-83 |

| Phase rotation, 82, 111 |

| indicator, 359-60 |

| Phase transformation, 84-86 |

| Scott connection, 84-85 |

| T connection, 91 |

| three to two phase, 84-86, 91, 110-11 |

| wye two phase connection, 85-86 |

| Pilot protection, 268-73 |

| Plastic, 35 |

| Platform, 43, 46-47 |

| Pneumatically operated mechanism, circuit breaker, 162-64 |

| Polarity, 70-72, 75, 96-97, 108-12 |

| additive, 70-71, 75, 80, 85, 108-9 |

| angular, 110-11 |

| single phase, 108 |

| subtractive, 70-71, 75, 77, 108-9 |

| test, 70-72, 108-11 |

| three phase, 75, 77, 81-83, 109-11 |

| two phase, 75, 85 |

| Pole, 43-46 |

| Pole, magnetic, 6 |

| Poly chlorinated biphenyl (PCB), 34 |

| Polyphase, 73-74, 91 |

| Porcelain, 35-36, 48, 97 |

| bushing, 148 |

| Portable transformer, 40 |

| Potassium hydroxide, 288, 293, 303 |

| Potential transformer, 96-98, 112, 151, 352, 355-56 |

| Potentiometer, 356, 362 |

| Pothead, 189-92 |

| Power, 3, 5, 11, 15, 19, 70, 75, 78-81 |

| Power factor, 11, 121, 308-9 |

| meter, 337 |

| test, 170-71 |

| Pressure, 31, 59 |

| Primary winding, 14-16, 18-20, 22, 27-28, 70-72, 89, 92-93, 98-99, 101, 113 (see also Coil; Turns) |

| Protective relays (see Relays) |

| Protective zones, 259-60 |

| Protector, network, 48-9 |

| Pyranol, 34 |

| Q |

| Quencher, de-ion arc, 142, 144-45 |

| R.. |

| Radiator, 32, 60, 65 |

| Rating, transformer, 5, 19, 72, 83, 85 |

| Ratio, vent-volume, 34, 48 |

| Ratio of transformation, 14-15, 88, 90, 92, 98, 112-13 |

| Reactance, 11-13, 17, 27, 113 |

| capacitance, 11-13 |

| inductive, 11, 13, 17 |

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