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Page 391

| Reactive power, 309 |

| Reactive volt-ampere-hour meter, 340, 347 |

| Reactive volt-ampere meter, 334-35, 353 |

| Reactors, 305-8 |

| air core, 306 |

| construction, 306 |

| current limiting, 305, 307 |

| function, 305 |

| iron core, 306 |

| maintenance, 308 |

| oil filled, 308 |

| operation, 308 |

| operation, principle of, 305-6 |

| saturated iron core, 306-7 |

| types, 306-8 |

| Recloser, circuit, 154-55, 263 |

| Reclosing relay, 250-51 |

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

| Rectifier, 103, 313-25 |

| arc-back, 321 |

| construction, 319 |

| contact, or disk type, 316-18, 321, 324 |

| copper oxide, 317, 324 |

| disk, or contact type, 316-18, 321, 324 |

| function, 313 |

| heating out, 321 |

| ignitron, 320-23 |

| inverter, 322 |

| Keep Alive circuit, 315 |

| maintenance, 324 |

| mercury arc, 314, 316, 318-20 |

| operation, 321-23 |

| operation, principle of, 314 |

| selenium, 317, 324 |

| storage battery, (see Battery) |

| troubleshooting, 325 |

| Regulation, 18, 77, 89, 96-97, 103, 113-14 |

| Regulator, voltage, 37-38, 91-93 |

| induction, 91-93, 113-14 |

| step type (TCUL), 92-96 |

| Relay, protective, 235-80 |

| auxiliary, 252-53 |

| carrier pilot, 271 |

| combination, 243 |

| contacts, 237, 253, 275-77 |

| differential, 247-50 |

| directional, 245-47 |

| disk, 241-43 |

| distance, 266 |

| distribution circuit, 260-61 |

| electromagnetic, 241-43 |

| electromechanical, 239-41, 274 |

| electronic, 254-57 |

| function, 235-36 |

| ground, 273-74 |

| impedance, 266 |

| induction, 241-43, 246, 274 |

| maintenance, 274-75 |

| microwave, 272-73 |

| operation, 259-74 |

| operation, principle of, 236-37 |

| overcurrent, 238-44 |

| definite time, principle, 239 |

| design and construction, 239-44 |

| instantaneous, principle, 238 |

| inverse time, principle, 238-39 |

| pilot protection, 268 |

| pilot wire, 268-71 |

| plunger, 239-41 |

| protective zones, 259-60 |

| reclosing, 250-51 |

| selectivity, 236, 239 |

| solid state, 255-56 |

| testing, 278 |

| torque compensator, 242 |

| transducer, 257 |

| troubleshooting, 279-80 |

| Relays, 32, 48, 57, 66, 92, 96 |

| Relief diaphragm, 31, 59 |

| Resistance, 11-13, 17, 26, 62, 66, 108, 113, 116 |

| measurement, 357-59 |

| test, 169 |

| Resonance, 13 |

| Review, 20-21, 41-42, 54, 67-68, 87, 104-6, 124-25 |

| Rheostat, 64 |

| Riser, 53 |

| S. |

| Safety, 27, 29, 43, 53, 59, 67, 97, 100, 118 |

| Safety interlock, capacitor, 313 |

| Sand filled fuse, 206 |

| Scale, 60 |

| Scott connection, 84-85, 91 |

| Seal, gas-oil, 31 |

| Secondary winding, 14-20, 22, 27-28, 70-72, 89, 92-93, 98-99 (see also Coil; Turns) |

| Selector switch, 92-95 |

| Selenium rectifier, 317, 324 |

| Self inductance, 9-10 (see also Inductance) |

| Series circuit, 97-99 |

| Shell type transformer, 23, 26 |

| Short circuit, 28, 37, 59, 64, 84, 91, 97-98, 129-30 |

| current, 131, 199-203 |

| electrostatic, 35 |

| stress, 28-29 |

| Shunt, 350-51 |

| Sign lighting transformer, 53, 100-101 |

| Sine wave, 8, 73, 81 |

| SL transformer, 99-100 |

| Sludge, 30-31, 59-60 |

| Sodium vapor lamp, 101-2 |

| Solenoid, 16 |

| Solid state relaying, 255-56 (see also Relays) |

| Sound, 22-23, 25, 43, 59, 67 (see also Noise) |

| Sparkover characteristic, 230, 232 |

| Specific gravity, 294-96, 300-301 |

| Standard impulse voltage wave, 119, 232 |

| Star or wye system, 74 (see also Wye connection) |

| Steel (core), 22-24, 29 |

| silicon, 22 |

| tank, 40 |

| Step-type voltage regulator, 92-96 |

| Storage batteries (see also Battery, storage) |

| Street lighting, 95-100 |

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