GE 850 Instruction Manual page 278

CURRENT ELEMENTS
MULTIPLIER CURRENT (I/I
(TDM)
1.5
10.00 444.44
100.00 4444.44
600.00 26666.7
4
Table 6-11: I T CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER CURRENT (I/I
(TDM)
1.5
0.01 0.1975
0.10 1.9753
1.00 19.753
10.00 197.531
100.00 1975.31
600.00 11851.9
6–10
)
pickup
2.0 3.0 4.0
250.00 111.11 62.50
2500.00 1111.1 625.00
15000.0 6666.7 3750.0
4
I T CURVES
4
The curves for the I t are derived from the formula:
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 is
RESET
"Timed")
)
pickup
2.0 3.0 4.0
0.0625 0.0123 0.0039
0.6250 0.1235 0.0391
6.250 1.235 0.391
62.500 12.346 3.906
625.00 123.46 39.06
3750.0 740.7 234.4
FLEXCURVES
The custom FlexCurves are described in detail in the FlexCurves section of 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 is
RESET
"Timed")
5.0 6.0 7.0
40.00 27.78 20.41
400.00 277.78 204.08
2400.0 1666.7 1224.5
5.0 6.0 7.0
0.0016 0.0008 0.0004
0.0160 0.0077 0.0042
0.160 0.077 0.042
1.600 0.772 0.416
16.00 7.72 4.16
96.00 46.3 25.0
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: PROTECTION SETPOINTS
8.0 9.0 10.0
15.63 123.5 10.00
156.25 123.46 100.00
937.50 740.74 600.00
8.0 9.0 10.0
0.0002 0.00015 0.0001
0.0024 0.0015 0.0010
0.024 0.015 0.010
0.244 0.152 0.100
2.44 1.52 1.00
14.65 9.14 6.00