Measurement Units And Setting Ranges - ABB REL 301 Instruction Leaflet

3.1.

MEASUREMENT UNITS AND SETTING RANGES

DISTANCE MEASUREMENTS
• Three variable mho phase-to-ground units and one variable mho phase-to-phase impedance
unit per zone. Three Zones Phase and Ground Distance (Zone-1, 2, 3):
0.01 - 50 ohms in 0.01 ohm steps for 5 A (ct type)
0.05 - 250 ohms in 0.05 ohm steps for 1 A (ct type)
Any Zone (phase or ground distance) can be disabled
• Zone Timers – Separate timers for phase and ground:
Zone-1 (0 to 15 cycles in 1 cycle steps)
Zone-2 (0.10 to 2.99 seconds in 0.01 second steps, Blocked of Torque Control Overcurrent)
Zone-3 (1.10 to 9.99 seconds in 0.01 second steps, Blocked)
Forward Directional Ground Timer (FDOGTime) (0 to 15 cycles in 1 cycle steps, Blocked)
OVERCURRENT MEASUREMENTS
• One ground directional ("Inst. G")
rent setting for (I
2.0 - 150 in 0.5 A steps for 5 A (ct type)
0.4 - 30 in 0.1 A steps for 1 A (ct type)
• Three-phase non-directional overcurrent units (I
Fault Trip with one setting ("Low IØ").
• One ground overcurrent unit ("3I0s") for Loss Of Current monitoring.
• Three non-directional medium set overcurrent units (IA
vision with one setting ("IM").
• One non-directional medium set ground overcurrent unit (I
sion with one setting ("3I0m").
0.5 - 10 in 0.5 A steps for 5 A (ct type)
0.1 - 2 in 0.1 A steps for 1 A (ct type)
• Three inverse time overcurrent phase units with CO type characteristics (see Figures 2-32
through 2-38) for Zone-2 phase torque control, time delay:
Pickup (0.5 - 10.0) in 0.1 A steps for 5 A (ct type).
Choice of 7 time-curve families (CO-2, 5, 6, 7, 8, 9, 11 Characteristics), 63 curves per family
with instantaneous or time delay reset.
(Pickup (0.1 - 2.0) in 0.1 A steps for 1 A (ct type).)
• One inverse time overcurrent ground unit with CO characteristics (see Figures 2-32 through
2-38) for Zone-2 ground torque control, time delay:
Pickup (0.5 - 10.0) in 0.1 A steps for 5 A (ct type).
Choice of 7 time-curve families (CO-2, 5, 6, 7, 9, 11 Characteristics), 63 curves per family
with instantaneous or time delay reset.
(Pickup (0.1 - 2.0) in 0.1 A steps for 1 A (ct type).)
1. Bold type in quotation marks indicates LCD display quantities
Section 3. SETTING CALCULATIONS
1
, I , I , I ):
AH BH CH OH
and one phase directional ("Inst. Ø") high-set overcur-
, I , I ) for Load Loss Trip and Close-Into
AL BL CL
, I
M BM
0M
I.L. 40-386.4
, I ) for phase distance super-
CM
) for ground distance supervi-
3-1