Timing accuracy example (be1-50/51b-214/-215/-223), Curve characteristics, Table – Basler Electric BE1-50/51B-121 User Manual
Page 15
9252000994 Rev P
BE1-50/51B-214/-215/-223/-225 General Information
1-3
Timing Accuracy Example (BE1-50/51B-214/-215/-223)
PU setting .................................. 5 amperes
Current Applied .......................... 6.5 amperes
+ Multiple Tolerance .................. 6.655 amperes
– Multiple Tolerance .................. 6.345 amperes
Time Curve ................................ E
Time Dial .................................... 5.0
Minimum time dial
using 6.655 amperes ............... 46.5470 seconds
Maximum time dial
using 61.3968 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 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
K
BD
C
M
AD
T
N
T
+
+
=
-