GE 869 Instruction Manual page 314

PROTECTION
2
Table 4-33: I T CURVE TRIP TIMES (IN SECONDS)
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 4444.44
600.00 26666.7
4
Table 4-34: 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
4–182
2
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
0.25 0.11 0.06
2.50 1.11 0.63
25.00 11.11 6.25
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
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
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
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
8.0 9.0 10.0
0.02 0.01 0.01
0.16 0.12 0.10
1.56 1.23 1.00
15.63 123.5 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