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S4 Elements
Table 5–5: ANSI Curve Trip Times (in seconds)
Multiplier
(TDM)
1.5
2.0
ANSI Extremely Inverse
0.5
2.000
0.872
1.0
4.001
1.744
2.0
8.002
3.489
4.0
16.004
6.977
6.0
24.005
10.466
8.0
32.007
13.955
10.0
40.009
17.443
ANSI Very Inverse
0.5
1.567
0.663
1.0
3.134
1.325
2.0
6.268
2.650
4.0
12.537
5.301
6.0
18.805
7.951
8.0
25.073
10.602
10.0
31.341
13.252
ANSI Normally Inverse
0.5
2.142
0.883
1.0
4.284
1.766
2.0
8.568
3.531
4.0
17.137
7.062
6.0
25.705
10.594
8.0
34.274
14.125
10.0
42.842
17.656
ANSI Moderately Inverse
0.5
0.675
0.379
1.0
1.351
0.757
2.0
2.702
1.515
4.0
5.404
3.030
6.0
8.106
4.544
8.0
10.807
6.059
10.0
13.509
7.574
GE Multilin
ANSI Curves:
The ANSI TOC shapes conform to industry standards and the ANSI C37.90 curve
classifications for extremely, very, normally, and moderately inverse shapes. The
ANSI curves are derived from the formula below, where 1.03
B
T
M
×
A
----------------------------------- -
=
+
I I
⁄
pickup
where: T = Operate Time (in seconds), M = Multiplier setpoint, I = Input Current
I
= Pickup Current setpoint, A, B, C, D, E = Constants
pickup
Table 5–4: ANSI Curve Constants
ANSI Curve Shape
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normally Inverse
ANSI Moderately Inverse
Current ( I / I
3.0
4.0
5.0
0.330
0.184
0.124
0.659
0.368
0.247
1.319
0.736
0.495
2.638
1.472
0.990
3.956
2.208
1.484
5.275
2.944
1.979
6.594
3.680
2.474
0.268
0.171
0.130
0.537
0.341
0.260
1.074
0.682
0.520
2.148
1.365
1.040
3.221
2.047
1.559
4.295
2.730
2.079
5.369
3.412
2.599
0.377
0.256
0.203
0.754
0.513
0.407
1.508
1.025
0.814
3.016
2.051
1.627
4.524
3.076
2.441
6.031
4.102
3.254
7.539
5.127
4.068
0.239
0.191
0.166
0.478
0.382
0.332
0.955
0.764
0.665
1.910
1.527
1.329
2.866
2.291
1.994
3.821
3.054
2.659
4.776
3.818
3.324
http://www.GEindustrial.com/multilin
Transformer Management Relay
D
------------------------------------------- -
------------------------------------------- -
+
+
2
C
(
I I
⁄
C
)
(
I I
⁄
–
–
pickup
pickup
A
B
C
0.0399
0.2294
0.5000
0.0615
0.7989
0.3400
0.0274
2.2614
0.3000
0.1735
0.6791
0.8000
)
pickup
6.0
7.0
0.093
0.075
0.063
0.185
0.149
0.126
0.371
0.298
0.251
0.742
0.596
0.503
1.113
0.894
0.754
1.483
1.192
1.006
1.854
1.491
1.257
0.108
0.094
0.085
0.216
0.189
0.170
0.432
0.378
0.340
0.864
0.755
0.680
1.297
1.133
1.020
1.729
1.510
1.360
2.161
1.888
1.700
0.172
0.151
0.135
0.344
0.302
0.270
0.689
0.604
0.541
1.378
1.208
1.082
2.067
1.812
1.622
2.756
2.415
2.163
3.445
3.019
2.704
0.151
0.141
0.133
0.302
0.281
0.267
0.604
0.563
0.533
1.208
1.126
1.066
1.812
1.689
1.600
2.416
2.252
2.133
3.020
2.815
2.666
745
I / I
20.0:
≤
<
pickup
E
(EQ 5.7)
3
C
)
–
D
E
3.0094
0.7222
–0.2840
4.0505
–4.1899
9.1272
–0.0800
0.1271
8.0
9.0
10.0
0.055
0.049
0.110
0.098
0.219
0.196
0.439
0.393
0.658
0.589
0.878
0.786
1.097
0.982
0.078
0.073
0.156
0.146
0.312
0.291
0.625
0.583
0.937
0.874
1.250
1.165
1.562
1.457
0.123
0.113
0.246
0.226
0.492
0.452
0.983
0.904
1.475
1.356
1.967
1.808
2.458
2.260
0.128
0.123
0.255
0.247
0.511
0.493
1.021
0.986
1.532
1.479
2.043
1.972
2.554
2.465
5–51
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