9328900990 Rev L BE1-951 Protection and Control 4-35
Figure 4-28. Voltage Protection Screen, 24 Tab
The default unit of measure for the Pickup setting is secondary amps. Primary amps (Pri Amps), per unit
amps (Per U Amps), and percent amps (% Amps) can also be selected as the pickup setting unit of
measure. The unit of measure for the Time setting that represents the element's time delay defaults to
milliseconds. It is also selectable for seconds, minutes, and cycles.
At the top of the 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. To the right of the Logic pull-down menu is a pull-down menu
labeled Settings. The Settings menu is used to select the setting group that the element's settings apply
to.
Using the pull-down menus and buttons, make the application appropriate settings to the Volts per Hertz
element.
Table 4-19 lists the operating settings for Volts per Hertz Overexcitation.
Table 4-19. Operating Settings for Volts per Hertz Overexcitation
Setting Range Increment Unit of Measure Default
Pickup 0.5 – 6 0.1 Sec. V/Hz 0
Trip Time Dial 0 – 9.9 0.1 N/A 0
Reset Time Dial 0 – 9.9 0.1 N/A 0
Programmable Alarm for Volts per Hertz Overexcitation
The Volts per Hertz function also has a settable alarm feature. If the Volts per Hertz level reaches a
settable percentage of the pickup level (0 - 120%), a programmable alarm bit is set. See Section 6,
Reporting and Alarm Functions, for more information. The setting for the alarm is via the SA-24
command.
Table 4-20 lists the programmable alarm settings for Volts per Hertz Overexcitation.
Table 4-20. Programmable Alarm Settings for Volts per Hertz Overexcitation
Setting Range Increment Unit of Measure Default
Alarm Level 0 – 120 1 % of pickup level 0
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