GE M60 Instruction Manual page 464
Motor protection system
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GROUPED ELEMENTS
Table 5-38: IEEE curve trip times (in seconds)
Multiplier
Current ( I / I
(TDM)
1.5
IEEE Extremely Inverse
0.5
11.341
1.0
22.682
2.0
45.363
4.0
90.727
6.0
136.090
8.0
181.454
10.0
226.817
IEEE Very Inverse
0.5
8.090
1.0
16.179
2.0
32.358
4.0
64.716
6.0
97.074
8.0
129.432
10.0
161.790
IEEE Moderately Inverse
0.5
3.220
5
1.0
6.439
2.0
12.878
4.0
25.756
6.0
38.634
8.0
51.512
10.0
64.390
IEC curves
For European applications, the relay offers three standard curves defined in IEC 255-4 and British standard BS142. These
are defined as IEC Curve A, IEC Curve B, and IEC Curve C. The IEC curves are derived by the operate and reset time
equations.
where
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I
= Pickup Current setting
pickup
K, 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
Table 5-39: IEC (BS) inverse time curve constants
IEC (BS) curve shape
IEC Curve A (BS142)
IEC Curve B (BS142)
5-256
)
pickup
2.0
3.0
4.0
4.761
1.823
1.001
9.522
3.647
2.002
19.043
7.293
4.003
38.087
14.587
8.007
57.130
21.880
12.010
76.174
29.174
16.014
95.217
36.467
20.017
3.514
1.471
0.899
7.028
2.942
1.798
14.055
5.885
3.597
28.111
11.769
7.193
42.166
17.654
10.790
56.221
23.538
14.387
70.277
29.423
17.983
1.902
1.216
0.973
3.803
2.432
1.946
7.606
4.864
3.892
15.213
9.729
7.783
22.819
14.593
11.675
30.426
19.458
15.567
38.032
24.322
19.458
K
E
0.140
0.020
13.500
1.000
5.0
6.0
7.0
0.648
0.464
0.355
1.297
0.927
0.709
2.593
1.855
1.418
5.187
3.710
2.837
7.780
5.564
4.255
10.374
7.419
5.674
12.967
9.274
7.092
0.654
0.526
0.450
1.308
1.051
0.900
2.616
2.103
1.799
5.232
4.205
3.598
7.849
6.308
5.397
10.465
8.410
7.196
13.081
10.513
8.995
0.844
0.763
0.706
1.688
1.526
1.412
3.377
3.051
2.823
6.753
6.102
5.647
10.130
9.153
8.470
13.507
12.204
11.294
16.883
15.255
14.117
is "Timed")
RESET
t
r
9.7
43.2
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0
9.0
10.0
0.285
0.237
0.203
0.569
0.474
0.407
1.139
0.948
0.813
2.277
1.897
1.626
3.416
2.845
2.439
4.555
3.794
3.252
5.693
4.742
4.065
0.401
0.368
0.345
0.802
0.736
0.689
1.605
1.472
1.378
3.209
2.945
2.756
4.814
4.417
4.134
6.418
5.889
5.513
8.023
7.361
6.891
0.663
0.630
0.603
1.327
1.260
1.207
2.653
2.521
2.414
5.307
5.041
4.827
7.960
7.562
7.241
10.614
10.083
9.654
13.267
12.604
12.068
Eq. 5-41
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