5-36 F650 Digital Bay Controller GE Multilin
5.4 PROTECTION ELEMENTS 5 SETPOINTS
5
5.4.2.5 I2T CURVES
The following formulas define this type of curves:
where:
t = Operation time in seconds
Dial = multiplier setpoint
I = Input current
Itap = Current pickup value
T
RESET
= reset time in seconds
Table 5–36: TRIPPING TIME IN SECONDS FOR I2T CURVES
5.4.2.6 DEFINITE TIME CURVES
The definite time makes the unit trip when the current value is maintained beyond the pickup value during a longer period
than the set value. The Dial setpoint allows modifying this time frame from instantaneous to 900 seconds in steps of 10 ms.
5.4.2.7 RECTIFIER CURVES
Rectifier curves are generated from the following formulas:
where:
T = Operation time (in seconds).
TDM = Multiplying factor
I = Input current
I
pickup
= Pickup current
T
reset
= Reset time (in seconds) assuming a 100% of power capacity and that the reset is activated
DIAL CURRENT (I/ITAP)
1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
0.01 0.444 0.250 0.111 0.063 0.040 0.028 0.020 0.016 0.012 0.010
0.10 4.444 2.500 1.111 0.625 0.400 0.278 0.204 0.156 0.123 0.100
1.00 44.444 25.000 11.111 6.250 4.000 2.778 2.041 1.563 1.235 1.000
10.00 444.444 250.000 111.111 62.500 40.000 27.778 20.408 15.625 12.346 10.000
100.00 4444.444 2500.000 1111.111 625.000 400.000 277.778 204.082 156.250 123.457 100.000
600.00 26666.667 15000.000 6666.667 3750.000 2400.000 1666.667 1224.490 937.500 740.741 600.000
1
6,5
I
I
45900
TDMT
pickup
1
2
I
I
45900
TDMT
pickup
reset
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