GE T35 Instruction Manual page 413

CHAPTER 5: SETTINGS
Multiplier Current ( I / I
pickup
(TDM)
1.5 2.0
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 5-31: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
IAC Short Inverse
Table 5-32: GE type IAC curve trip times
Multiplier Current ( I / I
pickup
(TDM)
1.5 2.0
IAC Extremely Inverse
0.5 1.699 0.749
1.0 3.398 1.498
2.0 6.796 2.997
4.0 13.591 5.993
6.0 20.387 8.990
8.0 27.183 11.987
10.0 33.979 14.983
IAC Very Inverse
0.5 1.451 0.656
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
)
3.0 4.0 5.0
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
)
3.0 4.0 5.0
0.303 0.178 0.123
0.606 0.356 0.246
1.212 0.711 0.491
2.423 1.422 0.983
3.635 2.133 1.474
4.846 2.844 1.966
6.058 3.555 2.457
0.269 0.172 0.133
6.0 7.0 8.0
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
6.0 7.0 8.0
0.093 0.074 0.062
0.186 0.149 0.124
0.372 0.298 0.248
0.744 0.595 0.495
1.115 0.893 0.743
1.487 1.191 0.991
1.859 1.488 1.239
0.113 0.101 0.093
GROUPED ELEMENTS
9.0 10.0
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. 5-34
t
r
6.008
4.678
0.990
0.222
9.0 10.0
0.053 0.046
0.106 0.093
0.212 0.185
0.424 0.370
0.636 0.556
0.848 0.741
1.060 0.926
0.087 0.083
5-211
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