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Page 392

| Street lighting transformers, 95-100 |

| constant current, 95-97 |

| IL, 99-100 |

| SL, 99-100 |

| Stress, 37 |

| electrostatic, 35 |

| short circuit, 28-29, 37, 91, 112, 119 |

| Substations, 31, 39, 49-50, 52, 66, 261-66 |

| transformers, 39, 49, 59 |

| Subtractive polarity (see Polarity) |

| Subtransmission, 261-66 |

| Subway type transformer, 47, 49 |

| Sulphur hexafluoride, 136-37 |

| bushing, 150 |

| Sulfphuric acid, 285, 291 |

| Supervisory system, 57-58 |

| Surge arrester (see Lightning arrester) |

| voltage, 26, 38, 59, 66, 118-19 |

| Switches, 178-96 |

| air, 180-86 |

| air break, 183-85 |

| cut out, 188-89 |

| disconnect, 181-82 |

| maintenance, 194-96 |

| oil, 179-80 |

| operation, 191-93 |

| Switchgear, metalclad, 152-53 |

| Switching, 26, 38, 51, 59, 93-95, 104 |

| T |

| Tankcircuit breaker 138, 146, 150, 152 |

| fins, 32 |

| rectifier, 319-20 |

| transformer, 29-32, 39-40, 47-48, 59-61, 64-65, 72, 118 |

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

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

| Tap changing under load (TCUL), 91-96, 113, 115 |

| T connection, 84, 91 |

| Teaser transformer, 84 |

| Temperature, 19-20, 26, 29-31, 48, 56-59, 62-65, 99, 108, 114-17 |

| rise, 19, 29, 102, 108, 117 |

| Terminals, 22, 34-35, 59, 61-62, 67, 70-72 |

| Test, testingbreaker travel indication, 171 |

| bushing power factor, 121 |

| circuit breaker, 168-71 |

| continuity (TCUL), 115-16 |

| heat run, 116 |

| high voltage, 107, 117-18 |

| impedance, 113-14, 117 |

| impulse, 118-19 |

| induced voltage, 120 |

| insulation resistance, 120 |

| liquid insulation, 121 |

| loading transformer under test, 116-17 |

| low voltage, 107 |

| megohmmeter, 170 |

| oil, 60-61, 170 |

| phase displacement, 110-12 |

| polarity, 110-11 |

| power factor, 170 |

| ratio, transformer, 112-13 |

| regulation, 120-21 |

| relay, 278 |

| resistance, 108, 110, 117, 120-21, 169 |

| transformer losses, 117 |

| Thermocouple, 108, 116 |

| Thermometer, 108, 116 |

| Time current characteristic, 200-203, 243, 260-261 |

| fuse, 200-203, 260-61 |

| relay, 243, 260-61 |

| Transducer, 257 |

| Transformers, 3-123 |

| action under load, 15-16 |

| as a device 3, 5, 14 |

| banking, 19, 84 |

| bell ringing, 53, 103 |

| bushing, 22, 34, 36 |

| capacity, 5, 19 (see also Rating, transformer) |

| connections, 70-86 |

| constant current, 97-99 |

| construction, 22 |

| coolant, cooling, 22, 107 |

| cores, 22 (see also Core, transformer; Core type) |

| distribution, 23, 43-45, 47, 50-51, 71, 81, 97 |

| overhead, 43, 46, 47 |

| underground, 47-49 |

| exciting current, 18, 76, 81, 112, 116, 120 |

| generation of voltage, 13 |

| how it works, 6 |

| IL, 99-100 |

| impedance, 118, 113-14 |

| inspection, 56 |

| installation, 43 |

| instrument, 95-97, 278-79, 352 |

| current, 95-97, 151, 250, 278-79 |

| potential, 95-97, 112, 151, 278-79 |

| insulation, 12, 23, 29 |

| invention of, 3 |

| load monitoring, 57 |

| losses, 15, 17 |

| copper, 17, 19, 114 |

| eddy current, 17-18, 113-14 |

| hysteresis, 17, 22-23 |

| I2R, 17-19, 108, 113-14 |

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

| no load, 18 |

| maintenance, 43, 56, 60 |

| more than two winding, 39 |

| mounting, 43-45 (see also Lugs, lifting) |

| cluster, 41, 44 |

| crossarm, 44 |

| direct, 44-45 |

| hanger, 44-45 |

| pad mounted, 47 |

| platform, 46-47 |

| nameplate, 19-20 |

| network, 14 |

| noise, 23, 25, 43 (see also Noise; Sound) |

| operation, 56 |

| phase, 19, 39 |

| single, 39, 71-73, 108-9 |

| three, 39, 73-75, 110 |

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