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5.5 GROUPED ELEMENTS
I2t CURVES:
2
The curves for the I
t are derived from the formulae:
where: T = Operate Time (sec.); TDM = Multiplier Setting; I = Input Current; I
T
= Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)
RESET
2
Table 5–17: I
T CURVE TRIP TIMES
MULTIPLIER
(TDM)
1.5
0.01
0.44
0.10
4.44
1.00
44.44
10.00
444.44
100.00
4444.4
600.00
26666.7
DEFINITE TIME CURVE:
The Definite Time curve shape operates as soon as the pickup level is exceeded for a specified period of time. The base
definite time curve delay is in seconds. The curve multiplier of 0.00 to 600.00 makes this delay adjustable from instanta-
5
neous to 600.00 seconds in steps of 10 ms.
where: T = Operate Time (sec.), TDM = Multiplier setting
I = Input Current, I
T
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
c) INSTANTANEOUS OVERCURRENT
PATH: SETTINGS
GROUPED ELEMENTS
INSTANTANEOUS
OVERCURRENT 1
5-112
100
------------------------- -
2
T
TDM
I
=
--------------- -
I
pickup
2.0
3.0
4.0
0.25
0.11
0.06
2.50
1.11
0.63
25.00
11.11
6.25
250.00
111.11
62.50
2500.0
1111.1
625.00
15000.0
6666.7
3750.0
T
TDM in seconds, when I I
=
T
=
RESET
= Pickup Current setting
pickup
SETTING GROUP 1(6)
IOC1 FUNCTION:
Disabled
IOC1 CT:
MESSAGE
F1
IOC1 PICKUP:
MESSAGE
1.200 pu
IOC1 PICKUP DELAY:
MESSAGE
0.000 s
IOC1 RESET DELAY:
MESSAGE
0.000 s
IOC1 BLOCK:
MESSAGE
Off
IOC1 TARGET:
MESSAGE
Self-Reset
IOC1 EVENTS:
MESSAGE
Disabled
B90 Low Impedance Bus Differential System
100
----------------------------
T
TDM
I
,
=
--------------- -
RESET
I
pickup
pickup
CURRENT ( I / I
)
pickup
5.0
6.0
7.0
0.04
0.03
0.02
0.40
0.28
0.20
4.00
2.78
2.04
40.00
27.78
20.41
400.00
277.78
204.08
2400.0
1666.7
1224.5
pickup
TDM in seconds
CURRENT ELEMENTS
Range: Disabled, Enabled
Range: Available current channels
Range: 0.001 to 30.000 pu in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic™ operand
Range: Self-Reset, Latched, Disabled
Range: Enabled, Disabled
5 SETTINGS
2
–
= Pickup Current Setting;
8.0
9.0
10.0
0.02
0.01
0.01
0.16
0.12
0.10
1.56
1.23
1.00
15.63
12.35
10.00
156.25
123.46
100.00
937.50
740.74
600.00
INSTANTANEOUS OVERCURRENT
GE Multilin
(EQ 5.8)
(EQ 5.9)
(EQ 5.10)
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