I.B. 17555C
Effective November 1999
Page 8
TABLE 2.3 CHARACTERISTIC FOR GROUND ELEMENT
TYPE SETTING AVAILABLE SETTING TOLERANCE CURVE #
CURVE SHAPE
IT, I
2
T, I
4
T, FLAT, MOD, VERY, XTRM,
IECA, IECB, IECC, IECD
INVERSE TIME OVERCURRENT
PICKUP
0.100, 0.125, 0.150, 0.175, 0.200, 0.225,
0.250, 0.275, 0.300, 0.350, 0.400, 0.450,
0.500, 0.550, 0.600, 0.650, 0.700, 0.750,
0.800, 0.850, 0.900, 0.950, 1.00, 1.25,
1.50, 1.75, 2.00, NONE
+ 5%
INVERSE TIME OVERCURRENT
TIME MULTIPLIER
Ground Time Multiplier setting options
depend upon Ground Curve setting
selection.
Curve = IT, I
2
T, I
4
T:
0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55,
0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95,
1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75,
3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50,
7.00, 7.50, 8.00, 8.50, 9.00, 10.0, 12.5, 15.0,
17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 35.0, 40.0
Curve = FLAT:
0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50,
0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85,
0.90, 0.95, 1.00, 1.25, 1.50, 1.75, 2.00
Curve = ANSI MOD, VERY, XTRM:
0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0,
3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0,
4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0
Curve = IECA, IECB, IECC, IECD:
0.025, 0.050, 0.075, 0.100, 0.125, 0.150,
0.175, 0.200, 0.225, 0.250, 0.275, 0.300,
0.325, 0.350, 0.375, 0.400, 0.425, 0.450,
0.475, 0.500, 0.525, 0.550, 0.575, 0.600,
0.625, 0.650, 0.675, 0.700, 0.725, 0.750,
0.775, 0.800, 0.825, 0.850, 0.875, 0.900,
0.925, 0.950, 0.975, 1.00
±10%
➀ ➁ ➄
±0.05 SEC
±10%
➀ ➂ ➄
±10%
➀ ➂ ➄
IT SC-5401-92B
I
2
T SC-5400-92B
I
4
T SC-5399-92B
FLAT
SC-5402-92B
MOD SC-6685-96
VERY SC-6686-96
XTRM SC-6687-96
IECA SC-6688-96
IECB SC-6689-96
IECC SC-6690-96
IECD SC-6691 -96
SHORT DELAY PICKUP 0.100, 0.125, 0.150, 0.175, 0.200, 0.225,
0.250, 0.275, 0.300, 0.350, 0.400, 0.450,
0.500, 0.550, 0.600, 0.650, 0.700, 0.750,
0.800, 0.850, 0.900, 0.950, 1.00, 1.25,
1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00,
3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50,
7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.0,
11.0, NONE
+ 10% SC-5403-92B
SHORT DELAY TIME
(In Seconds)
0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35,
0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70,
0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.25,
1.50
+ 0.05 SEC SC-5403-92B
INSTANTANEOUS PICKUP 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80,
0.85, 0.90, 0.95, 1.00, 1.25, 1.50, 1.75,
2.00, 2.25, 2.50, 2.75, 3.00, 3.50, 4.00,
4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 8.00,
8.50, 9.00, 9.50, 10.0, 11.0, NONE
+ 10% SC-5396-92B
NOTES:
➀
Curves go to constant operating time above 30 X I
n
.
➁ Tolerance: ± 10% or 0.09 seconds, whichever is larger. Minimum operating trip time is 0.05 seconds.
➂ Tolerance: ± 10% or 0.09 seconds, whichever is larger (>1.5 x I
pu
). Minimum trip time is 2 power line cycles.
➃ For IECD, the Time Multiplier Tolerance is ±0.05 seconds.
➄ For Ground Pickup ≤0.2
pu
: trip time tolerance is ±15%.
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