9252000897 Rev A
BE1-50/51B-233 General Information
1-3
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
∗
Constants
BE1 Similar
To
Figure
Number
†
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
∗
Constants
BE1 Similar
To
Figure
Number
†
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
Notes for Tables 1-2 and 1-3
∗
BE1 Curve Types:
S: Short Inverse
V: Very Inverse
L: Long Inverse
E: Extremely Inverse
D: Definite Time
B: BS142 Very Inverse
M: Moderately Inverse
C: BS142 Extremely Inverse
I: Inverse
F: Fixed Time Delay
† Figure numbers refer to the characteristic curves located in Appendix A,
Time Characteristic Curves.
‡ Curves B and C are defined in British Standard BS142 and IEC Standard IEC 255-4.
§ Fixed time delay, adjustable from 0.1 to 9.9 seconds.
Integrating Reset
Reset begins when the current drops below 95% of pickup. Integrating reset simulates the disk reset of
electromechanical relays. BE1-50/51B-233 relays provide the integrating reset function even when input
current falls to zero.
Summary of Contents for BE1-50/51B-233
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