GE G60 Instruction Manual page 455

CHAPTER 5: SETTINGS
T = Operate time (in seconds)
TDM = Multiplier setting
I = Input current
I = Pickup Current setting
pickup
T = reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
2
Table 5-36: I t curve trip times
Multiplier Current ( I / I
(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
FlexCurves
FlexCurves are described in the FlexCurves section later in this chapter. The curve shapes for the FlexCurves are derived
from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input Current
I = Pickup Current setting
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and
RESET
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
instantaneous to 600.00 seconds in steps of 10 ms. The definite time curve shapes are defined as follows:
where
T = Operate Time (in seconds)
TDM = Multiplier setting
I = Input Current
I = Pickup Current setting
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
)
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
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
: Timed)
RESET
GROUPED ELEMENTS
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. 5-13
Eq. 5-14
Eq. 5-15
Eq. 5-16
5-241
5