Diff Alarm
The Diff Alarm tab (Figure 14-17) brings up a screen that allows setting the percentage of differential
characteristic. The default value is 67% but the permissible range is 50 to 100.
Figure 14-17. Percentage Differential Screen, Diff Alarm Tab
Overcurrent Protection
Pull down the
Screens
menu and select
Overcurrent
or click on the Overcurrent Protection icon
that is shown at the right margin of this paragraph. This screen has seven folder tabs and the first
tab is
51
.
51
This screen (Figure 14-18) allows you to enter the settings for the 51 time overcurrent elements. BE1-
CDS240 relays have four phase time overcurrent elements, five neutral time overcurrent elements, and
four negative-sequence time overcurrent elements. They are divided up into three tabs, (
51, 151/251,
and
351/451
). The pull down
Pickup
menu allows you to select the relative pickup quantity. BE1-CDS240
relays measure the current input in secondary amperes. If you want to use per unit, percent amperes, or
primary current, you must coordinate the settings in
CT & VT Setup
and
Conversions
. Do this also for the
27R Threshold
setting. If you want to use the voltage control mode instead of voltage restraint, pull down
the menu for
Restraint
(default setting) and select
Control
. Settings for
Time Dial, Curve
(time
characteristic curve), and
Direction Control
are conventional settings. If you want to change the
characteristic curve constants, select the
Curve Coefficients
and a dialog box opens for those entries.
Select the
BESTlogic
button at the bottom of the
Phase (51P)
panel. The status of the logic is shown
above the
BESTlogic
button. A dialog box (
BESTlogic Function Element
) opens showing the status of the
element logic and the logic scheme name. If you have a custom logic scheme active, you may change the
status of the element logic by pulling down the menu and selecting from the available choices.
14-14
BE1-CDS240 BESTCOMS Software
9365200990 Rev F
Summary of Contents for BE1-CDS240
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Page 349: ...Figure 12 5 Horizontal Rack Mount Front View 9365200990 Rev F BE1 CDS240 Installation 12 5 ...
Page 361: ...Figure 12 17 Typical DC Connection Diagrams 9365200990 Rev F BE1 CDS240 Installation 12 17 ...
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