Page 545 - Offshore Electrical Engineering Manual

532 Index

Marine environment, 3 MOSFETs. See Metal oxide semiconductor
Master trip and lockout relays, 210 field-effect transistors (MOSFETs)
Material and equipment handling and storage, 202 Motor control centres (MCCs), 107, 279–280
Mathcad, 250 for offshore use, 107–108
MatLab, 250 software, 108–109
Maximum experimental safe gap (MESG), 305 Motor(s), 37, 127, 280–282, 301. See also
Maximum generation mode, 254 Generator(s)
MCBs. See Miniature circuit breakers (MCBs) commissioning tests, 375–380
MCCs. See Motor control centres (MCCs) evaluation of motor test results, 378–380
Mean High Water Spring (MHWS), 162 megohmmeter test, 375–376
Mean time between failures (MTBFs), 397–398 overpotential tests, 377–378
Mean time to repair (MTTR), 387–388 PI, 376–377
Meccano fashion, 286 control gear, 107
Mechanical protection, 299–300 intelligent MCCs, 108
Medium-voltage (MV). See also High-voltage low-voltage switchgear and MCCs for offshore
(HV); Low voltages (LVs) use, 107–108
distribution transformers, 5–7, 289 MCCs software, 108–109
generators, 207 medium-voltage starters, 109–110
starters, 109–110 cooling and IP, 104–105
direct on line starting, 109 faults and protection, 215
electronic, 109–110 abnormalities in driven machinery, 215–216
Megger test, 350, 375–376 abnormalities in supply system, 216
Megohmmeter test, 375–376 additional protection for synchronous
MESG. See Maximum experimental safe gap motors, 220
(MESG) conventional relay types, 217
Metal oxide semiconductor field-effect transistors detection of motor faults on large motors with
(MOSFETs), 111 Rogowski coils, 220
Metals, 295 electronic thermal replica relay, 218f
Metering, 268 motor mechanical faults, 215
MF. See Maintenance factor (MF) motor winding electrical faults, 215
MHWS. See Mean High Water Spring (MHWS) overload protection, 216
Microprocessor systems, 269–270 phase unbalance protection, 217
Miniature circuit breakers (MCBs), 227, 228f stalling protection, 217
Minimum generation mode, 254 static and microprocessor-based relay types,
Minor severity, 392 218, 219t
Mobile offshore drilling units, 338 load, 124
cement kill pumps and controls, 338 mechanical faults, 215
drilling mud facilities, 338 bearing failures, 215
electrical drilling direct current and alternating motor-driven Megger, 376
current semiconductor drives, 338 particular applications, 105
fire and gas systems and ventilation control pole configuration, 103–104
on rigs, 338 protection, 107
pontoon and leg equipment installation, 337 selection for hazardous areas, 319
power generation, 337 shafts, 281
UK Offshore Safety Case Legislation, 338 speed, 102
watertight door monitoring and ballast control starting, 101
systems, 337 test results evaluation, 378–380, 379t
Mobile oil installations, 28 thermal protection, 32–33
Modular construction, 21 voltage levels, 101
MOL. See Main oil line (MOL) winding electrical faults, 215
Momentary paralleling schemes, 213–214 MTBFs. See Mean time between failures (MTBFs)
Mooring system, 336 MTTR. See Mean time to repair (MTTR)
Morecambe Bay gas field, 460 Mud pumps, 457–458