Table of Contents
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ANSI CURVES
ANSI CURVE CONSTANTS
Moderately Inverse
Normally Inverse
Very Inverse
Extremely Inverse
MULT.
(M)
1.0
1.5
ANSI - MODERATELY INVERSE
0.5
8.728
0.675
0.8
13.965
1.081
1
17.457
1.351
1.2
20.948
1.621
1.5
26.185
2.026
2
34.913
2.702
3
52.370
4.053
4
69.826
5.404
6
104.74
8.106
8
139.65 10.807
10
174.57 13.509
15
261.85 20.264 11.361
20
349.13 27.019 15.148
ANSI - NORMALLY INVERSE
0.5
10.659
2.142
0.8
17.054
3.427
1
21.317
4.284
1.2
25.580
5.141
1.5
31.976
6.426
2
42.634
8.568
3
63.951 12.853
4
85.268 17.137
6
127.90 25.705 10.594
8
170.54 34.274 14.125
10
213.17 42.842 17.656
15
319.76 64.263 26.484 11.309
20
426.34 85.684 35.312 15.078 10.254
ANSI - VERY INVERSE
0.5
7.354
1.567
0.8
11.767
2.507
1
14.709
3.134
1.2
17.651
3.761
1.5
22.063
4.701
2
29.418
6.268
3
44.127
9.402
4
58.835 12.537
6
88.253 18.805
8
117.67 25.073 10.602
10
147.09 31.341 13.252
15
220.63 47.012 19.878
20
294.18 62.683 26.504 10.738
ANSI - EXTREMELY INVERSE
0.5
9.157
2.000
0.8
14.651
3.201
1
18.314
4.001
1.2
21.977
4.801
1.5
27.471
6.001
2
36.628
8.002
3
54.942 12.003
4
73.256 16.004
6
109.88 24.005 10.466
8
146.51 32.007 13.955
10
183.14 40.009 17.443
15
274.71 60.014 26.165
20
366.28 80.018 34.887 13.188
CURRENT PROTECTION RELAY - IPR-D
A
B
C
0.1735 0.6791
0.8
0.0274 2.2614
0.3
0.0615 0.7989
0.34
0.0399 0.2294
0.5
2
3
4
0.379
0.239
0.191
0.166
0.606
0.382
0.305
0.266
0.757
0.478
0.382
0.332
0.909
0.573
0.458
0.399
1.136
0.716
0.573
0.499
1.515
0.955
0.764
0.665
2.272
1.433
1.145
0.997
3.030
1.910
1.527
1.329
4.544
2.866
2.291
1.994
6.059
3.821
3.054
2.659
7.574
4.776
3.818
3.324
7.164
5.727
4.986
9.552
7.636
6.647
0.883
0.377
0.256
0.203
1.412
0.603
0.410
0.325
1.766
0.754
0.513
0.407
2.119
0.905
0.615
0.488
2.648
1.131
0.769
0.610
3.531
1.508
1.025
0.814
5.297
2.262
1.538
1.220
7.062
3.016
2.051
1.627
4.524
3.076
2.441
6.031
4.102
3.254
7.539
5.127
4.068
7.691
6.102
8.136
0.663
0.268
0.171
0.130
1.060
0.430
0.273
0.208
1.325
0.537
0.341
0.260
1.590
0.644
0.409
0.312
1.988
0.805
0.512
0.390
2.650
1.074
0.682
0.520
3.976
1.611
1.024
0.780
5.301
2.148
1.365
1.040
7.951
3.221
2.047
1.559
4.295
2.730
2.079
5.369
3.412
2.599
8.054
5.118
3.898
6.824
5.198
0.872
0.330
0.184
0.124
1.395
0.528
0.294
0.198
1.744
0.659
0.368
0.247
2.093
0.791
0.442
0.297
2.616
0.989
0.552
0.371
3.489
1.319
0.736
0.495
5.233
1.978
1.104
0.742
6.977
2.638
1.472
0.990
3.956
2.208
1.484
5.275
2.944
1.979
6.594
3.680
2.474
9.891
5.519
3.711
7.359
4.948
B
=
+
+
T
M
*
A
I
−
C
Ipu
D
E
TRIP TIME (SEC)
-0.08
0.1271
CURVE MULTIPLIER SETPOINT
-4.19
9.1272
INPUT CURRENT
-0.284
4.0505
PICKUP CURRENT SETPOINT
3.0094 0.7222
I/Ipu
5
6
7
8
0.151
0.141
0.133
0.242
0.225
0.213
0.302
0.281
0.267
0.362
0.338
0.320
0.453
0.422
0.400
0.604
0.563
0.533
0.906
0.844
0.800
1.208
1.126
1.066
1.812
1.689
1.600
2.416
2.252
2.133
3.020
2.815
2.666
4.531
4.222
3.999
6.041
5.630
5.332
0.172
0.151
0.135
0.276
0.242
0.216
0.344
0.302
0.270
0.413
0.362
0.324
0.517
0.453
0.406
0.689
0.604
0.541
1.033
0.906
0.811
1.378
1.208
1.082
2.067
1.812
1.622
2.756
2.415
2.163
3.445
3.019
2.704
5.167
4.529
4.056
6.889
6.039
5.408
0.108
0.094
0.085
0.173
0.151
0.136
0.216
0.189
0.170
0.259
0.227
0.204
0.324
0.283
0.255
0.432
0.378
0.340
0.648
0.566
0.510
0.864
0.755
0.680
1.297
1.133
1.020
1.729
1.510
1.360
2.161
1.888
1.700
3.242
2.831
2.550
4.322
3.775
3.399
0.093
0.075
0.063
0.148
0.119
0.101
0.185
0.149
0.126
0.223
0.179
0.151
0.278
0.224
0.189
0.371
0.298
0.251
0.556
0.447
0.377
0.742
0.596
0.503
1.113
0.894
0.754
1.483
1.192
1.006
1.854
1.491
1.257
2.782
2.236
1.885
3.709
2.981
2.514
A.2
Appendix A
D
E
+
2
3
I
I
−
−
C
C
Ipu
Ipu
9
10
15
0.128
0.123
0.110
0.204
0.197
0.177
0.255
0.247
0.221
0.306
0.296
0.265
0.383
0.370
0.331
0.511
0.493
0.442
0.766
0.740
0.663
1.021
0.986
0.884
1.532
1.479
1.326
2.043
1.972
1.768
2.554
2.465
2.210
3.830
3.698
3.315
5.107
4.931
4.419
0.123
0.113
0.082
0.197
0.181
0.132
0.246
0.226
0.165
0.295
0.271
0.198
0.369
0.339
0.247
0.492
0.452
0.329
0.738
0.678
0.494
0.983
0.904
0.659
1.475
1.356
0.988
1.967
1.808
1.318
2.458
2.260
1.647
3.688
3.390
2.471
4.917
4.520
3.294
0.078
0.073
0.058
0.125
0.117
0.093
0.156
0.146
0.116
0.187
0.175
0.139
0.234
0.218
0.174
0.312
0.291
0.232
0.469
0.437
0.348
0.625
0.583
0.464
0.937
0.874
0.696
1.250
1.165
0.928
1.562
1.457
1.160
2.343
2.185
1.739
3.124
2.913
2.319
0.055
0.049
0.035
0.088
0.079
0.056
0.110
0.098
0.070
0.132
0.118
0.084
0.165
0.147
0.105
0.219
0.196
0.141
0.329
0.295
0.211
0.439
0.393
0.281
0.658
0.589
0.422
0.878
0.786
0.562
1.097
0.982
0.703
1.646
1.474
1.054
2.194
1.965
1.405
Manual P/N: IPR-D GBM 01/09/2006
T
M
I
Ipu
20
0.104
0.167
0.209
0.250
0.313
0.417
0.626
0.835
1.252
1.669
2.087
3.130
4.173
0.066
0.106
0.133
0.159
0.199
0.265
0.398
0.530
0.796
1.061
1.326
1.989
2.652
0.051
0.082
0.102
0.122
0.153
0.204
0.306
0.408
0.612
0.815
1.019
1.529
2.039
0.030
0.048
0.060
0.072
0.090
0.119
0.179
0.239
0.358
0.477
0.597
0.895
1.194
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