Index



D
damping, 166, 518-21
reactors, 979
Darlington transistors, 127
d.c. drives:181
a.c. drives comparison, 177-80
fluid coupling comparisons, 178-80
motors, 178
performance comparisons, 178-80
variable speed comparisons, 178-80
d.c. link smoothing, 156-57
d.c. voltage sources, 157
d.c.transmission, see transmission
data concentrator, 387
de-rusting, 465-66
deep-sea mining, 196
deep-well pump motors, 190
definitions
surges, 649-55
metal properties, 1051
impulses, 649-55
metal properties, 1051-53
surges, 648-49
degreasing, 463-64
degree of protection verification, 306
busbar systems, 1093, 1097-98
controlgear assemblies, 486, 500-01
motors, 293, 306-11
switchgear assemblies, 486, 500-01
deionization theory, 723-25
delay tripping, 416-17
delayed action couplings, 223-24
delta to star conversion, 858
derating:
belts, 241-46
bus systems, 1005, 1021-22
cables, 623
motors using static drives, 162
proximity effects, 1021-23
design:
2500A non-isolated phase bus systems, 1025-36
bus systems, 420-24
calculations, 1025-36
metal enclosed, 997, 1007-08
core-balanced current transformers, 783-86
current transformers, 545-49, 783-86
grounding grids, 813-17
grounding stations, 806-10
metal enclosed bus systems, 997, 1007-8
reactors, 973-76
switchgear assemblies, 393-416, 424-38
voltage transformers, 531-43
DG sets, see diesel generators
dielectrics:
applications, 937
capacitors, 935-36






comparison, 937
loss factors, 302
verification, 301-02, 487-89
bus systems, 1093-96
capacitors, 965-67
controlgear assemblies, 486-90
motors, 293, 301-05
switchgear assemblies, 486-90
diesel generators, 579-81
active and reactive load sharing, 606
active power sharing, 608
acoustic enclosure, 580
auto mains failure (AMF) schemes, 587-88
automation through PLCs, 608
annunciation schemes, 588-90
circulating currents, 606
communication, 608
contactor chattering, 613
CPCB-central pollution control board, 580
electrical protection hunting, 601
floating neutral, 613
load sharing, 608
metering, 589-94
noise pollution, 580
OSHA-occupational safety and health
administration, 580
parallel operation, 594, 608
power diagrams, 591
power factors for selection of a DG set, 585
protection, 588-94
reactive power sharing, 608
selection, 585
starting, 587-88
see also generators synchronizing with infinite bus, 598-601
types of loads
linear, 586
non-linear, 586
special, 586
differential protection schemes, 553-57, 561
digital current integrator, 573
digital optical instrument trans-formers, 573
digital RC, 573, see also current measurement
diodes, 126
direct couplings, 223
direct on-line starting (DOL), 85-86
direct switching of capacitors (induction motors), 861-63
direct torque control (DTC), 123-25
directional ground fault protection, 789-90
discharge current in arresters, 688
discharge devices:
capacitors, 948-50
resistance, 948-50
series inductors, 950
discontinuous enclosures, non discontinuous enclosures
discrete constant load (motor duty), 69-70


distribution class surge arresters, 708-09
distribution networks:
layouts, 397
surge arresters, 683-84, 708-09
typical, 827
diversity factors, 396, 420
DMS-SCADA, see system voltage regulation
DOE (department of energy), 32
DOL, see direct on-line starting
domestic single-phase system protection, 775-78
double dielectric process, 936
double squirrel cage motors, 44-45, see also squirrel cage motors
double star arrangements, capacitors, 850
draw-out components, 430-31, 442
draw-out switchgear assemblies, 383-84
dripping water ingress protection, 23, 309
drives
a.c. comparison, 177-80
belt drives - see belt drives
d.c. comparison, 177-80
eddy current couplings, 233
fluid couplings, see fluid couplings
magnetic couplings, 233
static drives - see static drives
variable speed fluid drives - see fluid couplings.
driving torque DG sets, 594-95, 599
drying IPB enclosures, 1077
ducts, 960, 1026, 1070
see also bus systems
dust protection, 306
duties, induction motors, 63-82
duty cycles, contactors/switches, 354
duty rating, slip-ring induction motors, 104
dynamic currents:
metal enclosed switchgear assemblies, 499-500
testing, 1097
bus system, 1093-1097
switchgear assemblies, 486, 499-500
transformers, 563-64
current, 568
dynamic stability
distribution networks
power generating stations,
power networks,
transmission network, see reactive controls

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