Time overcurrent characteristic curves – Basler Electric BE1-851 User Manual
Page 332
Table A-1. 51P, 51N, and 51Q Time Characteristic Curve Constants
Curve
Selection
Curve Name
Trip Characteristic Constants
Reset †
A
B
C
N
K
R
S1
Short Inverse
0.2663 0.03393
1
1.2969
0.028
0.5
S2
Short Inverse
0.0286
0.0208
1
0.9844
0.028
0.094
L1
Long Inverse
5.6143 2.18592
1
1
0.028
15.75
L2
Long Inverse
2.3955
0
1
0.3125
0.028
7.8001
D
Definite Time
0.4797 0.21359
1
1.5625
0.028
0.875
M
Moderately Inverse
0.3022
0.1284
1
0.5
0.028
1.75
I1
Inverse Time
8.9341 0.17966
1
2.0938
0.028
9
I2
Inverse Time
0.2747 0.10426
1
0.4375
0.028
0.8868
V1
Very Inverse
5.4678 0.10814
1
2.0469
0.028
5.5
V2
Very Inverse
4.4309
0.0991
1
1.9531
0.028
5.8231
E1
Extremely Inverse
7.7624 0.02758
1
2.0938
0.028
7.75
E2
Extremely Inverse
4.9883
0.0129
1
2.0469
0.028
4.7742
A
Standard Inverse
0.01414
0
1
0.02
0.028
2
B
Very Inverse (I
2
t)
1.4636
0
1
1.0469
0.028
3.25
C
Extremely Inverse (I
2
t)
8.2506
0
1
2.0469
0.028
8
G
Long Time Inverse (I
2
t)
12.1212
0
1
1
0.028
29
F
Fixed Time ∗
0
1
0
0
0.028
1
P
Programmable ‡
0 to 600 0 to 25
0 to 1
0.5 to 2.5
0.028
0 to 30
∗
Curve F has a fixed delay of one second times the Time Dial setting.
† For integrated reset, append
R to the curve name. For example, curve S1 has instantaneous reset.
Curve
S1R has integrated reset.
‡ The programmable curve allows for four significant digits after the decimal place for every variable.
Time Overcurrent Characteristic Curves
Figures A-1 through A-16 illustrate the characteristic curves of the BE1-851 relay. Table A-2 cross-
references each curve to existing electromechanical relay characteristics. Equivalent time dial settings
were calculated at a value of five times pickup.
A-2
BE1-851 Time Overcurrent Characteristic Curves
9289900990 Rev R