GE B90 Instruction Manual page 223

5 SETTINGS
I2t CURVES:
2
The curves for the I t are derived from the formulae:
T
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-
neous to 600.00 seconds in steps of 10 ms.
where: T = Operate Time (sec.), TDM = Multiplier setting
I = Input Current, I
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
c) INSTANTANEOUS OVERCURRENT

PATH: SETTINGS GROUPED ELEMENTS
OVERCURRENT 1(24)
 INSTANTANEOUS
 OVERCURRENT 1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
GE Multilin
100
------------------------- -
2
TDM × I T
 
,
=
--------------- -
RESET
 
I
pickup
CURRENT ( I / I
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 TDM in seconds
=
RESET
= Pickup Current setting

SETTING GROUP 1(6)
IOC1 FUNCTION:
Disabled
IOC1 CT:
F1
IOC1 PICKUP:
1.200 pu
IOC1 PICKUP DELAY:
0.000 s
IOC1 RESET DELAY:
0.000 s
IOC1 BLOCK:
Off
IOC1 TARGET:
Self-Reset
IOC1 EVENTS:
Disabled
B90 Low Impedance Bus Differential System
100
----------------------------
2
TDM × I
  –
=
--------------- -
 
I
pickup
= Pickup Current Setting;
pickup
)
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
 
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
5.5 GROUPED ELEMENTS
(EQ 5.8)
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
(EQ 5.9)
(EQ 5.10)
INSTANTANEOUS
5-103
5