9424200996 8-3
BE1-11t Auxiliary Overvoltage (59X) Protection
Relevant if 59X-x function is set for integrating reset.
R
Constant specific to
selected curve
Affects the speed of reset when integrating reset is selected.
Curve constants are entered on the Overvoltage (59X) 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 8-1. 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 59X-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.
Figure 8-1. Time Overvoltage Characteristic Curves
Pickup and Trip
The Pickup output occurs first, followed by the Trip output.
Pickup
The Pickup output becomes true when the measured voltage increases above the voltage threshold
established by the Pickup setting. In BESTlogicPlus, the Pickup output can be connected to other logic
elements to annunciate the condition, control other elements in logic, and start the fault recorder (logic
element FAULTTRIG).
Assertion of the Pickup output initiates a timer that begins timing to a trip. The duration of the timer is
established by the Time Delay (definite timing) or Time Dial (inverse timing). A Time Delay or Time Dial
setting of zero (0) makes the 59X element instantaneous with no intentional time delay.
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