GE T35 Instruction Manual page 414
Transformer protection system
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GROUPED ELEMENTS
Multiplier
Current ( I / I
(TDM)
1.5
1.0
2.901
2.0
5.802
4.0
11.605
6.0
17.407
8.0
23.209
10.0
29.012
IAC Inverse
0.5
0.578
1.0
1.155
2.0
2.310
4.0
4.621
6.0
6.931
8.0
9.242
10.0
11.552
IAC Short Inverse
0.5
0.072
1.0
0.143
2.0
0.286
4.0
0.573
5
6.0
0.859
8.0
1.145
10.0
1.431
2
I
t curves
2
The I
t curves are derived as follows:
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 "Timed")
RESET
2
Table 5-33: I
t curve trip times
Multiplier
(TDM)
0.01
0.10
1.00
10.00
100.00
600.00
5-212
)
pickup
2.0
3.0
4.0
1.312
0.537
0.343
2.624
1.075
0.687
5.248
2.150
1.374
7.872
3.225
2.061
10.497
4.299
2.747
13.121
5.374
3.434
0.375
0.266
0.221
0.749
0.532
0.443
1.499
1.064
0.885
2.997
2.128
1.770
4.496
3.192
2.656
5.995
4.256
3.541
7.494
5.320
4.426
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
Current ( I / I
)
pickup
1.5
2.0
3.0
0.44
0.25
0.11
4.44
2.50
1.11
44.44
25.00
11.11
444.44
250.00
111.11
4444.4
2500.0
1111.1
26666.7
15000.0
6666.7
5.0
6.0
7.0
0.266
0.227
0.202
0.533
0.453
0.405
1.065
0.906
0.810
1.598
1.359
1.215
2.131
1.813
1.620
2.663
2.266
2.025
0.196
0.180
0.168
0.392
0.360
0.337
0.784
0.719
0.674
1.569
1.439
1.348
2.353
2.158
2.022
3.138
2.878
2.695
3.922
3.597
3.369
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
4.0
5.0
6.0
0.06
0.04
0.03
0.63
0.40
0.28
6.25
4.00
2.78
62.50
40.00
27.78
625.00
400.00
277.78
3750.0
2400.0
1666.7
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0
9.0
0.186
0.174
0.372
0.349
0.745
0.698
1.117
1.046
1.490
1.395
1.862
1.744
0.160
0.154
0.320
0.307
0.640
0.614
1.280
1.229
1.921
1.843
2.561
2.457
3.201
3.072
0.026
0.025
0.051
0.050
0.102
0.100
0.204
0.200
0.307
0.301
0.409
0.401
0.511
0.501
7.0
8.0
9.0
0.02
0.02
0.01
0.20
0.16
0.12
2.04
1.56
1.23
20.41
15.63
12.35
204.08
156.25
123.46
1224.5
937.50
740.74
10.0
0.165
0.331
0.662
0.992
1.323
1.654
0.148
0.297
0.594
1.188
1.781
2.375
2.969
0.025
0.049
0.099
0.197
0.296
0.394
0.493
Eq. 5-35
10.0
0.01
0.10
1.00
10.00
100.00
600.00
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