GE F650 Instruction Manual page 190

5 SETTINGS
5.4.2.5 I2T CURVES
The following formulas define this type of curves:
where:
t = Operation time in seconds
Dial = multiplier setting
I = Input current
Itap = Current pickup value
T = reset time in seconds
RESET
Table 5–38: TRIPPING TIME IN SECONDS FOR I2T CURVES
DIAL CURRENT (I/ITAP)
1.5 2.0
0.01 0.444 0.250
0.10 4.444 2.500
1.00 44.444 25.000
10.00 444.444 250.000
100.00 4444.444 2500.000
600.00 26666.667 15000.000 6666.667
5.4.2.6 DEFINITE TIME CURVES
The definite time makes the element trip when the current value is maintained beyond the pickup value during a longer time
period than the set value. The Dial setting allows modifying this time frame from instantaneous to 900 seconds in steps of
10 ms.
5.4.2.7 RECTIFIER TIME CURVES
Rectifier curves are generated from the following formulas:
where:
T = Operation time (in seconds).
TDM = Multiplying factor
I = Input current
I = Pickup current
pickup
T = Reset time (in seconds) assuming a 100% of power capacity and that the reset is activated
reset
GEK-106310AB
3.0 4.0 5.0
0.111 0.063 0.040
1.111 0.625 0.400
11.111 6.250 4.000
111.111 62.500 40.000
1111.111 625.000 400.000
3750.000 2400.000
F650 Digital Bay Controller
5.4 PROTECTION ELEMENTS
6.0 7.0 8.0
0.028 0.020 0.016
0.278 0.204 0.156
2.778 2.041 1.563
27.778 20.408 15.625
277.778 204.082 156.250
1666.667 1224.490 937.500
9.0 10.0
5
0.012 0.010
0.123 0.100
1.235 1.000
12.346 10.000
123.457 100.000
740.741 600.000
5-43