Page 534 - Offshore Electrical Engineering Manual

Index

Note: ‘Page numbers followed by “f” indicate figures, “t” indicate tables’.

A synchronous generators
Abnormalities variable-frequency drives, 119–120, 120f
in driven machinery, 215–216 Alternators
in supply system, 216 and excitation systems, 62
Abseiling, 408–409 faults and protection devices
AC. See Alternating current (AC) field faults and asynchronous operation, 210
ACB. See Air circuit breaker (ACB) master trip and lockout relays, 210
Acceptance criteria, 378, 431 neutral Earthing and Earth faults, 207
Accessibility, 407–408 over-/underfrequency protection, 209
Accommodation, 339, 409 over-/undervoltage protection, 209
emergency lighting, 159 overcurrent protection, 208
lighting overload protection, 208
normal lighting, 159 package control and supervision, 210
process area lighting, 159–160 phase and interturn faults, 208
Admittance matrix, 240 rotor faults, 209
Aero engine derived type, 47, 48f unbalanced loading and negative phase
Air break switching devices for voltages, 353–354 sequence protection, 209
Air circuit breaker (ACB), 72–73 winding protection, 208–209
for voltages above 1000 V, 354–356 heat run procedure, 31
Air cored types, 82 subtransient reactance (X″d), 62
Air-conditioned pressurised modules, 111 Ambient air temperatures, 28, 30–31
Air-to-air heat exchanger, 104–105 American relays, 263
Aircraft communications, 113 Ammeters, 353
Alarm annunciator, 268–269 Annunciator, 268–269
ALARP. See As Low As Reasonably Practicable Anode consumption, 143
(ALARP) Anticondensation heaters, 350
Alternating current (AC), 83, 90, 111, 284. Arc
See also Direct current (DC) arc-chute, 72–73, 89
brushless alternator, 37, 38f extinguishing, 73
compounding, 41 quenching methods, 90
flameproof motor, 60 runners, 90
generators, 35 Arcing faults, 221, 231–232, 237
capability diagram, 37–39, 40f Armature type relay, 207
offshore, 35 Artificial lift facilities, 463
load sharing of generators, 41 As Low As Reasonably Practicable (ALARP), 414
load–voltage characteristics, 41–42 Astatic control system, 269
parallel operation of generators, 39–40 Asynchronous operation, 210
phasor diagrams, 36f ATEX EX ‘E’ increasing safety certified motors, 34
principals of operation, 35–37 Atmospheric light loss factor, 158
generating voltage, 36 Attracted armature relays
power factor, 37 electrical tests on, 369
speed, 36 insulation tests, 369
subtransient reactance, 36 secondary injection tests, 369
transient reactance, 37 mechanical checks on and, 366
secure alternating current and direct current Auto transformer starting, 107
power supplies, 9 Auto/manual voltage control selector switch,
supplies, 113–114 265–267
521