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Page 387

| Clearing time, fuse, 200 |

| Cluster, 44 |

| Coil, transformer, 6-7, 13-18, 25-31, 34, 37-39, 60, 62, 65, 72-73, 92, 113 (see also Turns; Windings) |

| Condensation, water, 31 |

| Condenser (see Capacitor) |

| Conductor, 6-13, 17, 26, 35, 37, 60 (see also Wire) |

| Connections, meter, 348-49 |

| Connections, transformer, 70-86 |

| boost-buck, 86 |

| phase transformation, 84-85 |

| single phase, 73 |

| three phase, 74-83 |

| two phase, 75, 84-85 |

| Conservator, oil, 31-32 |

| Constant current transformer, 97-99 |

| Contact, or disk rectifier, 316-18, 321-24 |

| copper oxide, 317, 324 |

| selenium, 317, 324 |

| Contact-making voltmeter, 92 |

| Contacts, 138-42, 165-68, 215, 274-77 |

| air, 138 |

| air switch, 166-68 |

| bayonet type, 142 |

| brush type, 141 |

| butt type, 139 |

| circuit breaker, 138-42, 165-66 |

| fuse, 215 |

| maintenance, 165-66 |

| movable, 138, 147 |

| relay, 274-77 |

| stationary, 138-42 |

| types, 138-42 |

| wedge type, 139-41 |

| Continuity test, 115 |

| Control system, storage battery, 283 |

| Coolant, cooling, cooling system, 22, 26-34, 40, 52, 60, 65, 107 |

| Coordinating points, fuse, 201-3 |

| Copper, 26, 59 |

| Copper losses, 17, 19, 29 |

| Copper oxide rectifier, 317, 324 |

| Core, transformer, 7, 13-14, 17-18, 22-31, 34, 39, 60, 70, 113, 117-18 |

| Core type, 23-24 |

| spiral wound, 25 |

| Cover, 40, 48-9, 59, 62 |

| Cross arms, 40, 44 |

| CSP transformer, 50, 56 |

| Current, 3, 7-19, 26, 57, 90 |

| exciting, 112, 116 |

| fault, 130-32, 146, 265 |

| Current transformer, 96-97, 151, 237, 278-79 |

| Cut out, 49-50, 52 |

| Cut out, fuse, 188 |

| Cycle, 8-9, 11, 14, 81 |

| D |

| DC (see Direct current) |

| De-ion arc quencher, 142, 144-45 |

| De-ion fuse, 211, 213 |

| Delta connection, 74-76, 81 |

| closed, 76, 83 |

| open, 77 |

| wye, 78-79, 83 |

| Demand meter, 340-41 |

| Demand watthour meter, 343-45 |

| Diaphragm, relief, 31, 159 |

| Dielectric absorption, 313 |

| Dielectric strength, oil, 148 |

| Differential relay, 247-50 |

| Direct current, 3, 5, 70, 103, 108, 110 (see also DC) |

| Directional relay, 245-47 |

| Disconnecting devices, 178-97 (see also Switches) |

| Disconnects, 181-86 |

| blades, 187-88 |

| clamps, 189 |

| fuses as, 211 |

| jumpers, 189 |

| load interrupter, 190 |

| Disk, or contact rectifier, 316-17, 324 |

| Distance relay, 265-66 |

| Distribution circuit, 260-61 |

| Drain, 49 |

| Ducts, 32 |

| Dynamometer, 330-32, 334, 336 |

| E |

| Eddy currents, 17-18, 23-24, 113 |

| Edison battery, 285 |

| Efficiency, autotransformer, 89 |

| Efficiency, transformer, 19-20 |

| Electrodynamometer, 330 |

| Electromagnet, 7 |

| Electromagnetic fields, 3, 6-7 |

| Electromagnetic force (EMF), 8 |

| Electromagnetic induction, 7 |

| Electron, 11, 17 |

| Electronic relaying, 254-57 |

| Electrostatic stress, 35 |

| bushing, 149 |

| EMF (see Electromotive force) |

| Enclosure, 29, 34, 39, 53 |

| Energy, 17 |

| Epoxy, 34 |

| Equalizing charge, battery, 301, 303 |

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

| Explosion chamber, circuit breaker, 142 |

| F |

| Fans, 32 |

| Fault, 62, 66, 99 |

| circuit breaker, 129-31 |

| current, 53, 132-34, 146, 266 |

| fuse, 199-200, 260-61 |

| incipient, 56 |

| temporary, 59 |

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