Index



O
oceanographic phenomenon, 515
OCR see over-current relays
ODVA open devicenet vendors association,165
oil circuit breakers, 726-28, 749-53
on-load start-up motor heating, 50
open-circuit voltage ratio tests, 306
operating parameters DG Sets, 581-84
operating power factors for industries, 867
operation theory DG Sets, 584-85
opposing torque, electric motors, 47
optical fibre cables (OFC), 840
optical isolation scheme, 392
optical sensors, 570
see current measurement




OSHA- occupational safety and health administration -see diesel generators
outdoor current transformers, 546
see current transformers
outputs, (short time rating) induction motors, 77-79
over-current protection, 327-32
over-current relays (OCR), 329-30, 355
energy based discrimination, 420
over-current releases, 730-32
overhead:
bus systems, 988-89
lines, 649
overlaps, joints, 1043-45



overspeed tests, 300
over-voltages, 643-822
computation, 943
formulae, 772
standards, 772
temporary, 647-48, 759-72
theory, 761, see also circuit
interrupters; surge arresters; voltage surges

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