Curve characteristics – Basler Electric BE1-50/51B-231 User Manual
Page 13
9252000895 Rev C
BE1-50/51B-231 General Information
1-3
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.
Curve Characteristics
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 Tables 1-2 and 1-3. 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 1-2. 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
A-1
0.2663
0.03393
1.000
1.2969
0.028
0.500
L
ABB CO-5
A-2
5.6143
2.18592
1.000
1.000
0.028
15.750
D
ABB CO-6
A-3
0.4797
0.21359
1.000
1.5625
0.028
0.875
M
ABB CO-7
A-4
0.3022
0.12840
1.000
0.5000
0.028
1.750
I
ABB CO-8
A-5
8.9341
0.17966
1.000
2.0938
0.028
9.000
V
ABB CO-9
A-6
5.4678
0.10814
1.000
2.0469
0.028
5.500
E
ABB CO-11
A-7
7.7624
0.02758
1.000
2.0938
0.028
7.750
B
BS142-B ‡
A-8
1.4638
0.00000
1.000
1.0469
0.028
3.250
C
BS142-C ‡
A-9
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
Table 1-3. Time Characteristic Curve Constants with SW3-3 Closed (On)
Curve Type ∗
Figure
Number †
Constants
BE1
Similar To
A
B
C
N
K
R
S
GE IAC 55
A-10
0.0286
0.0208
1.000
0.9844
0.028
0.0940
L
GE IAC 66
A-11
2.3955
0.00002
1.000
0.3125
0.028
7.8001
D
ABB CO-6
A-3
0.4797
0.21359
1.000
1.5625
0.028
0.8750
M
ABB CO-7
A-4
0.3022
0.12840
1.000
0.5000
0.028
1.7500
I
GE IAC 51
A-12
0.2747
0.1042
1.000
0.4375
0.028
0.8868
V
GE IAC 53
A-13
4.4309
0.0991
1.000
1.9531
0.028
5.8231
E
GE IAC 77
A-14
4.9883
0.0129
1.000
2.0469
0.028
4.7742
B
BS142-B ‡
A-8
1.4636
0.00000
1.000
1.0469
0.028
3.2500
C
BS142-C ‡
A-9
8.2506
0.00000
1.000
2.0469
0.028
8.0000
F
None §
N/A
0.0000
1.00000
0.000
0.0000
0.000
1.0000
∗
BE1 Curve Types:
S: Short InverseV: Very Inverse
Notes for Tables 1-2 and 1-3
L: Long InverseE: Extremely Inverse
D: Definite TimeB: BS142 Very Inverse
M: Moderately Inverse
C: BS142 Extremely Inverse
I: Inverse F: Fixed Time Delay
K
BD
C
M
AD
T
N
T
+
+
=
-