GE 845 Instruction Manual page 262

PROTECTION
MULTIPLIER CURRENT (I/I
(TDM)
1.5
0.5 0.072
1.0 0.143
2.0 0.286
4.0 0.573
6.0 0.859
8.0 1.145
10.0 1.431
2
Table 4-46: 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
4–158
)
pickup
2.0 3.0 4.0
0.047 0.035 0.031
0.095 0.070 0.061
0.190 0.140 0.123
0.379 0.279 0.245
0.569 0.419 0.368
0.759 0.559 0.490
0.948 0.699 0.613
2
I T CURVES
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")
5.0 6.0 7.0
0.028 0.027 0.026
0.057 0.054 0.052
0.114 0.108 0.105
0.228 0.217 0.210
0.341 0.325 0.314
0.455 0.434 0.419
0.569 0.542 0.524
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
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
8.0 9.0 10.0
0.026 0.025 0.025
0.051 0.050 0.049
0.102 0.100 0.099
0.204 0.200 0.197
0.307 0.301 0.296
0.409 0.401 0.394
0.511 0.501 0.493
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