Page 617 - Handbook of Electrical Engineering

610 INDEX

Dirty engine, gas turbine 38 Earth and ground notation 355
Diversity factor 4 Earth fault, in relation to earth loop impedance
Diversity factor applied to loads 199 233
Double frequency 492 Earth leakage circuit breaker 241
Double insulation 235 Earth loop impedance 200, 224, 240
Double wound transformers 364 Earthing
Doubling factor for fault current 164, 285, Apparent resistivity of soil 590
287, 292 Disconnection time 235, 242
Down-hole pumping 385 Double insulation 235
Fixed equipment 235
Downstream
Grid and rod system 585
Circuit 332
Hand-held equipment 235
Circuit breaker 293, 450
Portable equipment 235
Coordination and back-up of protective
TN and TT systems 242
devices 333
TN, TT and IT systems 235
Devices 333, 348
Earthing
Feeders 312
And grounding, defined 353
Fuses 330, 450
High impedance 323
Molded case circuit breakers 450 Grid resistance 589
Motors 318 In cubicles and panels 382
Protective devices 333 Inductor or transformer 328
Switchboard 329 Low impedance 323
Switchgear 157, 163, 318 Mutual resistance between the grid and rods
Transformer 318 592
D-Q axis or two-axis theory 64, 308 Resistance of all the rods 592
Drive end 80, 120 Resistance of the grid conductors 592
Drilling Solid at the star-point 333
Equipment 407 TN, TT and IT systems 364
Oil wells, DC motors systems 410 TNC, TNS, TNCS, TT and IT systems 360
Rigs 323, 328, 386, 394, 432 Earthing busbars
Wells 385 Clean 382
Vessels 354 Clean and instrument connections 382
Droop 84 General 382
Gain of speed governors 325 Single point earths 382
Earth loop impedance 343, 345
Governing of generators 433
Eddy current induction 304
Of DC output voltage 408
Droop characteristic, of a gas turbine 43 Eddy currents, in cable screens 381
Efficiency
Duty
Electro-mechanical conversion 37
Continuous 3 Ideal cycle 26
Current limiting short-time, of fuses 177
Of an induction motor 101, 106, 107
Fault breaking 149
Of compression 29
Fault breaking rms, of switchgear 152 Of turbine 29
Fault making for switchgear 291 Practical cycle 29
Fault current withstand, of switchgear 154 Electrical power in the two-axis form 54
Intermittent 3 Electric shock 147, 233, 343, 351, 354, 355,
Non-current limiting long-time, of fuses 356, 364, 367
177 At the far end of a cable 366, 367
Standby 3 Corner mesh voltage 590, 595
Symmetrical breaking, of switchgear 274 High risk 369
Worst case situation for maximum fault Ground potential rise 595
making 277 In a neutral circuit 365