Basler Electric BE1-851 - 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