Curve characteristics – Basler Electric BE1-50/51B-219 User Manual
Page 28
22
9252000981 Rev J
Maximum time dial
using 6.345 amperes:
61.3968 seconds
Curve time using 6.5 amperes: 53.1800 seconds
Curve Characteristics
Nine inverse time functions and one fixed time function can be selected by the front-panel Curve switch.
Characteristic curves for the inverse and definite time functions are defined by the following equation.
Where:
T
T
=
time to trip in seconds
D =
time dial setting
M
=
multiple of pickup setting
A, B, C, N, K =
constants for the particular curve
Time characteristic curve constants are listed in Table 3 and Table 4. Constants have been selected to
conform to the characteristics of electromechanical relays over a range of pickup multiples from 1.3 to 40.
Values of the constants are provided for use in computer relay setting software. Timing accuracy is
±1
cycle,
±2 percent of time to trip.
Table 3. Time Characteristic Curve Constants with SW3-3 Open (Off)
Curve Type
∗
Figure
Number †
Constants
BE1
Similar To
A
B
C
N
K
R
S
ABB CO-2
13
0.2663
0.03393
1.000
1.2969
0.028
0.500
L
ABB CO-5
14
5.6143
2.18592
1.000
1.000
0.028
15.750
D
ABB CO-6
15
0.4797
0.21359
1.000
1.5625
0.028
0.875
M
ABB CO-7
16
0.3022
0.12840
1.000
0.5000
0.028
1.750
I
ABB CO-8
17
8.9341
0.17966
1.000
2.0938
0.028
9.000
V
ABB CO-9
18
5.4678
0.10814
1.000
2.0469
0.028
5.500
E
ABB CO-11
19
7.7624
0.02758
1.000
2.0938
0.028
7.750
B
BS142-B ‡
20
1.4638
0.00000
1.000
1.0469
0.028
3.250
C
BS142-C ‡
21
8.2506
0.00000
1.000
2.0469
0.028
8.000
F
None §
N/A
0.0000
1.00000
0.000
0.0000
0.000
1.000
K
BD
C
M
AD
T
N
T
+
+
=
-
Specifications
BE1-50/51B-219/-226