BE1-50/51M General Information 1-5
SPECIFICATIONS
BE1-50/51M Overcurrent Relays are available with the following features and capabilities.
Current Sensing Input
(1 Ampere Unit) Continuous current: 2.8 amperes. One second current: 80 amperes.
(5 Ampere Unit) Continuous current: 14 amperes. One second current: 400 amperes.
TIME PICKUP Range
Setting the TIME PICKUP below the minimum pickup (0.1 on the 1 ampere
unit and 0.5 on the 5 ampere unit), places the relay in the most sensitive
state and may be used as a safety setting.
(1 Ampere Unit) 0.1 to 3.18 amperes in 0.02 ampere steps.
(5 Ampere Unit) 0.5 to 15.9 amperes in 0.1 ampere steps.
TIME Dropout
Dropout occurs at 95% of pickup value.
TIME PICKUP
Accuracy
The timing accuracy is the sum of +
1 cycle +2%. This is over the range of
1.3 to 40 times tap. This accuracy is for a given measured multiple of tap.
The measurement of the multiple of tap has an accuracy that is the sum of
+
2% +25 milliampere for 5 ampere units and +2% +5 milliamperes for 1
ampere units.
Example: (5 ampere unit)
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 Using 6.655 amperes: 46.5470 seconds
Maximum Time Using 6.345 amperes: 61.3968 seconds
Curve Time Using 6.5 amperes: 53.1800 seconds
Frequency Response
A change of ±5 hertz from the nominal 50/60 hertz current causes less
than 0.5% change in the current required for pickup.
TIME DIAL Range
(1 Ampere Unit) 0.0 to 9.9, in 0.1 steps.
(5 Ampere Unit) 0.0 to 9.9, in 0.1 steps.
INST PICKUP Range
Setting the INST PICKUP below the minimum pickup (0.2 on the 1 ampere
unit and 1.0 on the 5 ampere unit), places the relay in the most sensitive
state and may be used as a safety setting.
(1 Ampere Unit) 0.2 to 19.8 amperes in 0.2 ampere steps.
(5 Ampere Unit) 1 to 99 amperes in 1 ampere steps.
INST Dropout
Dropout occurs at 95% of pickup value.
Courtesy of NationalSwitchgear.com
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