9328900990 Rev L BE1-951 Protection and Control 4-45
Figure 4-37. Voltage Protection Screen, 47 Tab
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 elements settings apply
to.
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.
Using the pull-down menus and buttons, make the application appropriate settings to the negative-
sequence overvoltage element.
Operating settings for Negative-Sequence Overvoltage are summarized in
Table 4-27.
Table 4-27. Operating Settings for Negative-Sequence Overvoltage
Setting Range Increment Unit of Measure Default
Pickup
0 = Disabled
1 to 300
0.1 for 1 to 99.9
1.0 for 100 to 300
Secondary Volts 0
50 to 999 milliseconds 1 Milliseconds
0.1 for 0.1 to 9.9 Seconds
1 to 600 seconds
1.0 for 10 to 600 Seconds
3 to 36,000 cycles (60 Hz)
Time Delay
2.5 to 30,000 cycles (50 Hz)
∗
Cycles
50 ms
∗ Time delays less than 10 cycles can be entered to the nearest 0.1 cycles from the front panel HMI. All
time delays can be entered to the nearest 0.01 cycles from the ASCII command interface. Time delays
entered in cycles are converted to milliseconds or seconds. Increment precision after conversion is limited
to that appropriate for each of those units of measure.
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