GE G60 Instruction Manual page 453

CHAPTER 5: SETTINGS
Multiplier Current ( I / I
pickup
(TDM)
1.5 2.0
0.20 5.400 2.700
0.40 10.800 5.400
0.60 16.200 8.100
0.80 21.600 10.800
1.00 27.000 13.500
IEC Curve C
0.05 3.200 1.333
0.10 6.400 2.667
0.20 12.800 5.333
0.40 25.600 10.667
0.60 38.400 16.000
0.80 51.200 21.333
1.00 64.000 26.667
IEC Short Inverse
0.05 0.153 0.089
0.10 0.306 0.178
0.20 0.612 0.356
0.40 1.223 0.711
0.60 1.835 1.067
0.80 2.446 1.423
1.00 3.058 1.778
IAC curves
The curves for the General Electric type IAC relay family are derived from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input current
I = Pickup Current setting
pkp
A to E = constants defined in the table
t = characteristic constant defined in the table
r
T = reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
Table 5-34: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
IAC Short Inverse
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
)
3.0 4.0 5.0
1.350 0.900 0.675
2.700 1.800 1.350
4.050 2.700 2.025
5.400 3.600 2.700
6.750 4.500 3.375
0.500 0.267 0.167
1.000 0.533 0.333
2.000 1.067 0.667
4.000 2.133 1.333
6.000 3.200 2.000
8.000 4.267 2.667
10.000 5.333 3.333
0.056 0.044 0.038
0.111 0.088 0.075
0.223 0.175 0.150
0.445 0.351 0.301
0.668 0.526 0.451
0.890 0.702 0.602
1.113 0.877 0.752
A B C
0.0040 0.6379 0.6200
0.0900 0.7955 0.1000
0.2078 0.8630 0.8000
0.0428 0.0609 0.6200
6.0 7.0 8.0
0.540 0.450 0.386
1.080 0.900 0.771
1.620 1.350 1.157
2.160 1.800 1.543
2.700 2.250 1.929
0.114 0.083 0.063
0.229 0.167 0.127
0.457 0.333 0.254
0.914 0.667 0.508
1.371 1.000 0.762
1.829 1.333 1.016
2.286 1.667 1.270
0.034 0.031 0.029
0.067 0.062 0.058
0.135 0.124 0.115
0.269 0.247 0.231
0.404 0.371 0.346
0.538 0.494 0.461
0.673 0.618 0.576
D E
1.7872 0.2461
–1.2885 7.9586
–0.4180 0.1947
–0.0010 0.0221
GROUPED ELEMENTS
9.0 10.0
0.338 0.300
0.675 0.600
1.013 0.900
1.350 1.200
1.688 1.500
0.050 0.040
0.100 0.081
0.200 0.162
0.400 0.323
0.600 0.485
0.800 0.646
1.000 0.808
0.027 0.026
0.054 0.052
0.109 0.104
0.218 0.207
0.327 0.311
0.435 0.415
0.544 0.518
Eq. 5-11
t
r
6.008
4.678
0.990
0.222
5-239
5