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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 (Zone1, 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:
Zone1 (0 to 15 cycles in 1 cycle steps)
Zone2 (0.10 to 2.99 seconds in 0.01 second steps, Blocked of Torque Control)
Zone3 (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) and one phase directional (Inst. Ø) high-set over-
current 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
Close-Into 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
tance supervision with one setting (IM).
• One non-directional medium set ground overcurrent unit (I
supervision 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 units with CO type characteristics (see Figures 2-32
through 2-38) for Zone2 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.
(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 Zone2 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.
(Pickup (0.1 - 2.0) in 0.1 A steps for 1 A (ct type).)
(10/94)
Section 3. SETTING CALCULATIONS
, I
, I
, I
AH
BH
CH
):
OH
, I
, I
AL
BL
I.L. 40-386.3
) for Load Loss Trip and
CL
, I
, I
) for phase dis-
M
BM
CM
) for ground distance
0M
3-1
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