Basler BE1-CDS240, Instruction Manual

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The pickup setting determines the voltage pickup level of the element. Voltage pickup is based on PN.
The time delay setting controls how long it takes the trip output to become TRUE after the pickup output
becomes TRUE. When the monitored voltage increases above the pickup threshold, the pickup output
(47PU) becomes TRUE and the timer starts. If the voltage remains above the pickup threshold for the
duration of the time delay setting, the trip output (47T) becomes TRUE. If the voltage decreases below
the dropout ratio of 98 percent, the timer is reset to zero.
If the 60FL element trip logic is TRUE and V block is enabled for negative-sequence blocking <Q>, all
functions that use the negative-sequence voltage (V
2
) are blocked. For more information on the 60FL
function, see the paragraphs later in this section.
If the target is enabled for the 47 element, the target reporting function will record a target when the trip
output is TRUE and the fault recording function trip logic expression is TRUE. See Section 6,
Reporting
and Alarm Functions, Fault Reporting , for more information about target reporting.
BESTlogic Settings for Negative-Sequence Overvoltage
BESTlogic settings are made from the BESTlogic Function Element screen in BESTCOMS. Figure 4-44
illustrates the BESTCOMS screen used to select BESTlogic settings for the negative-sequence
overvoltage function. To open the screen, select
Voltage Protection from the Screens pull-down menu
and then select the 47 Tab. Then select the BESTlogic button at the bottom of the screen. Alternately,
settings may be made using the SL-47 ASCII command.
Figure 4-44. BESTlogic Function Element Screen, Negative Sequence (47)
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 negative-sequence overvoltage function 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.
9365200990 Rev F BE1-CDS240 Protection and Control 4-49