Basler BE1-11g Instruction Manual page 119

9424200994 Rev U
Parameter Description
Coefficient specific to
A
selected curve
Coefficient specific to
B
selected curve
Coefficient specific to
C
selected curve
Exponent specific to
N
selected curve
K Constant
Time to reset
T
R
Coefficient specific to
R
selected curve
Curve coefficients are entered on the Inverse Overcurrent (51) settings screen in BESTCOMSPlus.
Programmable curve coefficients can be entered only when the P curve is chosen for the protection
element from the Curve drop-down menu.
Table Curves
BESTCOMSPlus is used to set the 51 element Table Curves (T1, T2, T3, and T4). Using the Settings
Explorer within BESTCOMSPlus, open the Protection, Current, Table Curve (1, 2, 3, or 4) tree branch and
select the table curve to be modified. Refer to Figure 66. A minimum of 2 and maximum of 40 points can
be entered for any one T curve. When you are satisfied with the values chosen, select Save Curve. Use
the Settings Explorer to browse to the 51-x element you wish to program and use the drop-down menu
under Curve to select T1, T2, T3, or T4.
Table curves can be entered regardless of the curve chosen for the protection element. However, the
table curve will not be enabled until T1, T2, T3, or T4 is selected as the curve for the protective element.
BE1-11g
Affects the effective range of the time dial.
Affects a constant term in the timing equation. Has greatest
effect on curve shape at high multiples of tap.
Affects the multiple of PU where the curve would approach
infinity if allowed to continue below pickup. Has greatest effect on
curve shape near pickup.
Affects how inverse the characteristics are. Has greatest effect
on curve shape at low to medium multiples of tap.
Characteristic minimum delay term.
Relevant if 51-x function is set for integrating reset.
Affects the speed of reset when integrating reset is selected.
Figure 66. Inverse Overcurrent Table Curve
Explanation
Inverse Overcurrent (51) Protection
107