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Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Appendix A
Time Over-current Characteristic Curves
Time Over-current
Characteristic Curve
Graphs
The following illustrations show the characteristic curves of the CGCM-DLR.
Equivalent time dial settings were calculated at a value of five times pickup.
Characteristic Curve Cross-reference
table cross-references each curve to
existing electromechanical relay characteristics.
Table 35 - 51P and 51N Time Characteristic Curve Constants
Curve
Selection
Curve Name
Trip Characteristic Constants
Reset
A
B
C
N
K
R
1
S, Short Inverse
0.2663
0.03393
1.000
1.2969
0.028
0.5000
2
S2, Short Inverse
0.0286
0.02080
1.000
0.9844
0.028
0.0940
3
L1, Long Inverse
5.6143
2.18592
1.000
1.000
0.028
15.750
4
L2, Long Inverse
2.3955
0.00000
1.000
0.3125
0.028
7.8001
5
D, Definite Time
0.4797
0.21359
1.000
1.5625
0.028
0.8750
6
M, Moderately Inverse
0.3022
0.12840
1.000
0.5000
0.028
1.7500
7
I, Inverse Time
8.9341
0.17966
1.000
2.0938
0.028
9.0000
8
Inverse Time
0.2747
0.10426
1.000
0.4375
0.028
0.8868
9
V, Very Inverse
5.4678
0.10814
1.000
2.0469
0.028
5.5000
10
V2, Very Inverse
4.4309
0.09910
1.000
1.9531
0.028
5.8231
11
Extremely Inverse
7.7624
0.02758
1.000
2.0938
0.028
7.7500
12
E2, Extremely Inverse
4.9883
0.01290
1.000
2.0469
0.028
4.7742
13
Standard Inverse
0.01414
0.00000
1.000
0.0200
0.028
2.0000
14
B, Very Inverse (I
2
t)
1.4636
0.00000
1.000
1.0469
0.028
3.2500
15
Extremely Inverse (I
2
t)
8.2506
0.00000
1.000
2.0469
0.028
8.0000
16
Long Time Inverse (I
2
t)
12.1212
0.00000
1.000
1.0000
0.028
29.0000
17
Fixed Time
0.0000
1.00000
1.000
0.0000
0.028
1.0000