Basler Electric BE1-50/51B - Manual (Page 16)

1-4 BE1-50/51B General Information 9252000991 Rev R
Specifications
BE1-50/51B electrical and physical specifications are listed in the following paragraphs.
Current Sensing Input
Continuous Current.................... 2.8 Aac
1 Ampere Unit
One Second Rating ................... 80 Aac
Continuous Current.................... 14 Aac
5 Ampere Unit
One Second Rating ................... 400 Aac
Time Overcurrent (51) Element
Setting the TIME PICKUP control at the minimum pickup setting (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.
Setting Range ............................ 0.1 to 3.18 Aac
1 Ampere Unit Pickup
Setting Increment ....................... 0.02 Aac
Accuracy .................................... ±2%, ±5 milliamperes at or above 0.1 ampere setting
Setting Range ............................ 0.5 to 15.9 Aac
5 Ampere Unit Pickup
Setting Increment ....................... 0.1 Aac
Accuracy .................................... ±2%, ±25 milliamperes at or above 0.5 ampere setting
Dropout occurs at 95% of pickup value.
Dropout
0.0 to 9.9 seconds in 0.1 second steps.
Timing Range
The timing accuracy is the sum of ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times
tap and 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 milliamperes for 5 ampere units, and ±2%, ±5 milliamperes for 1 ampere
units.
Timing Accuracy
PU setting .................................. 5 amperes
Timing Accuracy Example (5 Ampere Unit)
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 6.345 amperes ............... 61.3968 seconds
Curve time using 6.5 amperes ... 53.1800 seconds
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
K BD
C M
AD
T
N
T
+ + =
-