1-10 BE1-50/51M - General Information
Time Characteristics
- Continued
Refer to Tables 1-3 or 1-4 for the time characteristic curve constants.
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 available for use in computer relay setting
programs. Timing accuracy is the sum of ±1 cycle and ±2%.
The fixed time characteristic provides delays of 0.0 to 9.9 seconds
corresponding to the time dial setting. The time set is constant over a
range of pickup multiples from 1.0 to 40. Accuracy is ±2% ±1 cycle for time
dial settings of 0.1 and greater.
Table 1-3. Time Characteristic Curve Constants
( Series 100 Relays or Series 200 Relays With SW3-3 Open (OFF) )
Curve Type Figure Constants
BE1 Similar To Number ABCNKR
S ABB CO-2 1-7 0.2663 0.03393 1.000 1.2969 0.028 0.500
L ABB CO-5 1-8 5.6143 2.18592 1.000 1.000 0.028 15.750
D ABB CO-6 1-9 0.4797 0.21359 1.000 1.5625 0.028 0.875
M ABB CO-7 1-10 0.3022 0.12840 1.000 0.5000 0.028 1.750
I ABB CO-8 1-11 8.9341 0.17966 1.000 2.0938 0.028 9.000
V ABB CO-9 1-12 5.4678 0.10814 1.000 2.0469 0.028 5.500
E ABB CO-11 1-13 7.7624 0.02758 1.000 2.0938 0.028 7.750
B BS142-B* 1-14 1.4636 0.00000 1.000 1.0469 0.028 3.250
C BS142-C* 1-15 8.2506 0.00000 1.000 2.0469 0.028 8.000
F None** None 0.0000 1.00000 0.000 0.0000 0.000 1.000
* Curves B and C are defined in British Standard BS142 and IEC 255-4 (International
Electrotechnical Commission)
** Fixed time from 0.1 to 9.9 seconds.
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
Courtesy of NationalSwitchgear.com
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