Page 624 - Handbook of Electrical Engineering

INDEX 617

Amplifier 54, 84 Field winding earth fault 326
Consumption 9 Inverse time 124
Factor of load 5 Lock-out 436
Factor of the fundamental current 410 Long time delay characteristic 163
Invariance in generalised machines 484 Negative phase sequence current 322, 326
Management system 435 Nominal current 348
Net available from the power turbine 26 Overvoltage 318
Reactive 69, 83, 443 Restricted earth fault 323
Reactive in harmonic systems 410 Reverse power 448
Reactive, summation in estimating load Sensitive earth current 596
199 Short time delay characteristic 163
System frequency 441 Synchronising check 158
System, fully loaded 311 Thermal 124, 337
System, lightly loaded 311 Undervoltage 159, 318, 335
Systems, national grid 431 Voltage restrained overcurrent 316
Transistors and thyristors 385, 402 Protective relays and devices 311
Transistors controllers 391, 394 Cascaded devices 451
Utility company 328 IEEE numbers 313
Potential gradient, maximum in cable Notation used for 313
insulation 373 Protection schemes and systems
Potential difference in earthed systems 355 Back-up 318, 333
Power angle chart 72 Cold and hot thermal, for motors 340, 344
Power factor 64, 85 Coordination 312
Power factor leading 73 Coordination of earth fault devices 333
Power factor of a transformer 140 Core-balance 242, 333, 345
Power factor of short circuit current 174 Core-balance for fluorescent lighting 346
Power-to-weight ratio 20 Core-balance for static loads 346
Power-to-weight ratio, high 19, 20 Core-balance for welding socket outlets
Power turbine 19 346
Power utility company 8, 20 Definite time 316
Pre-arcing time 174 Differential busbar zone 334
Pressure drops 32 Excessive vibration in motors 342
Combustion chamber 33 Fuses 333
Compressor discharge 33 High-set overcurrent for static loads 346
Turbine exhaust 33 High-set current 330
Pressure ratio 31, 33 High bearing temperature of motor 342
Prime-movers 13, 304 High speed differential current 333
Gas turbines 41 Instantaneous current 330, 332
Under and over frequency 325 Instantaneous overcurrent for static loads
Upgrading 13 346
Projects, new 5 Instantaneous tripping function 339
Prospective current in fuses 176 Inverse square law 330
Prospective fault current 79 Loss of excitation 320
Protective relays Merz-price scheme 333
Admittance type 320 Multi-zone distance 332
Buchholz 139, 398 Of high voltage motors 336
Coordination 312 Overcurrent and overvoltage in battery
Differential stator current 80, 318, 326 charger 452
Earth fault 124 Overcurrent in cables 332
Earth leakage current 451 Overcurrent in inverters 450
Earth leakage detection 242, 323 Overcurrent in the bus-section circuit 335
Electronic 336 Overloading for motors 336