Basler BE1-11g Instruction Manual page 84

72
Parameter Description
T Time to trip
T
D Time dial setting
M Multiple of pickup
Constant specific to
A
selected curve
Constant specific to
B
selected curve
Constant specific to
C
selected curve
Exponent specific to
N
selected curve
T Time to reset
R
Constant specific to
R
selected curve
Curve constants are entered on the Overvoltage (59P) settings screen in BESTCOMSPlus.
Programmable curve constants 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 27P element Table Curves (T1, T2, T3, and T4). Using the Settings
Explorer within BESTCOMSPlus, open the Protection, Voltage, Overvoltage, Table Curves, Table Curve
(1, 2, 3, or 4) tree branch and select the table curve to be modified. Refer to Figure 50. 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 59P-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.
Phase Overvoltage (59P) Protection
Table 21. Definitions for Equation 10 and Equation 11
Time that the 59P-x function will take to time out and trip.
Time dial setting for the 59P-x function.
Measured current in multiples of pickup. The timing algorithm has
a dynamic range of 1 to 3 times pickup.
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.
Relevant if 59P-x function is set for integrating reset.
Affects the speed of reset when integrating reset is selected.
9424200994 Rev U
Explanation
BE1-11g