9328900990 Rev L BE1-951 BESTCOMS Software 14-19
Power Protection (Directional Power)
Pull down the S
creens menu and select Power Protection or click on the Power Protection icon
that is shown at the right margin of this paragraph. This screen (
Figure 14-25) has no folder tabs
and is labeled Directional Power. The pull down Pickup menu allows you to select the relative
pickup quantity. The BE1-951 relay measures directional power input in secondary three-phase current. If
you want to use primary three phase watts, per unit three phase watts or percent three phase watts, you
must select it and coordinate the settings in CT & VT Setup and Conversions. The range is from 1.0 to
6,000 secondary watts. Select the Time delay unit of measure (milliseconds, seconds, or minutes) and
set the value for the 32 element in the range of 0.050 to 600 seconds. If Cycles is selected, the range is
from 3.00 to 36,000.00 cycles. Click the arrow near Direction to obtain a menu for choosing Forward or
Reverse.
Select the BESTlogic box at the bottom of the 32 column. The status of the logic is shown above the
BESTlogic box. 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.
Figure 14-25. Power Protection (Directional Power) Screen
Reclosing
Pull down the S
creens menu and select Reclosing or click on the Reclosing icon that is shown at
the right margin of this paragraph. This screen (
Figure 14-26) has no folder tabs and is labeled
Reclosing.
The reclosing function provides up to four reclosing attempts that can be initiated by a protective trip or by
one of the contact sensing inputs. To set the actual reclose sequence, first pull down the Time Units
menu and set the units for time measurement. Notice that when the Reclose 1 Time setting is zero, the
Sequence Controlled Block (SCB), Trip 1 is grayed out. Set the Reclose 1 Time for the first reclose time
and the SCB window is now available. Now enter the reclose times for the remaining reclose attempts.
The total time for all reclose attempts is cumulative. For example, the second reclose attempt is the sum
of Reclose 1 Time and Reclose 2 Time. Reclose three total time would be the sum of the reclose time for
three, two, and one. If you want to block the instantaneous or any other protection element during
reclose, check the SCB window or windows. If the 79C or 52 status is TRUE and the SCB is enabled
(checked) for the next reclose attempt, the 79 SCB output becomes TRUE and the output logic can be
used to block the instantaneous element.
Set the Reset time using the same unit of measure that was used for the reclosing attempts. Reset time is
how long you want the relay to remain reset before the relay returns to the initial state.
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