4-34 BE1-951 Protection and Control 9328900990 Rev L
Figure 4-27. BESTlogic Function Element Screen, 24
At the top center of the BESTlogic Function Element screen is a pull-down menu labeled Logic. This
menu allows viewing of the BESTlogic settings for each preprogrammed logic scheme. A custom logic
scheme must
be created and selected in the Logic pull-down menu at the top of the screen before
BESTlogic settings can be changed. See Section 7, BESTlogic Programmable Logic. Enable the
overexcitation element by selecting its mode of operation from the Mode pull-down menu. To connect the
elements inputs, select the button for the corresponding input in the BESTlogic Function Element screen.
The BESTlogic Expression Builder screen will open. Select the expression type to be used. Then, select
the BESTlogic variable, or series of variables to be connected to the input. Select Save when finished to
return to the BESTlogic Function Element screen. For more details on the BESTlogic Expression Builder,
see Section 7, BESTlogic Programmable Logic. Select Done when the settings have been completely
edited.
Table 4-18 lists the BESTlogic settings for Volts per Hertz Overexcitation.
Table 4-18. BESTlogic Settings for Volts per Hertz Overexcitation
Function Range/Purpose Default
Mode
0 = Disable
1 = Enable
0
BLK Logic expression that disables the function when TRUE. 0
Operating Settings Volts per Hertz Overexcitation
Operating settings for the 24 function consist of a pickup setting, a trip (time) dial, a reset (time) dial, and
an alarm threshold. A pickup of 0 disables the element. The unit of measure is secondary (Sec) VPP/Hz
or VPN/Hz and depends on the SG-VTP setting. For more information, refer to Section 3, Input and
Output Functions, Power System Inputs. Operating settings are made using BESTCOMS.
Figure 4-28
illustrates the BESTCOMS screen used to select operational settings for the Volts per Hertz element. To
open the screen, select Voltage Protection from the S
creens pull-down menu and select the 24 Tab.
Alternately, settings may be made using S<g>-24 and SA-24 ASCII command or through HMI Screen
5.x.1.1 where x represents the number of the setting group.
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