Basler Electric BE1-700 - Manual (Page 372)

Reclosing (Optional)
Pull down the Screens menu and select Reclosing or click on the Reclosing icon, which is shown
at the right margin of this paragraph. This screen (Figure 14-22) has no folder tabs and is labeled
Reclosing.
Figure 14-22. Reclosing Screen
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. There are two initiates and two close outputs in the 79 element and can
be viewed by pressing the BESTlogic button on the Reclosing screen. Pilot Initiate (PI) produces a
reclosing attempt through the 79 Pilot Close (79P) output, and Reclose Initiate (RI) produces reclosing
attempts through the 79 Close (79C) output. PI attempts are normally associated with high speed tripping
of transmission lines where breakers on both ends open simultaneously and high speed reclose together,
without need for voltage and synchronism checks (one-shot). RI attempts can be associated with either
radial distribution or sub-transmission reclosing applications where voltage and synchronism checks are
not required, or transmission network time delay reclosing applications that do require voltage and
synchronism checks prior to closing the breaker (multiple time delay attempts). Additional logic is required
for voltage and synchronism checks, and is only available in the voltage version of the BE1-700 Digital
Protective Relay.
To set the actual reclose sequence, first pull down the Time Units menu box and set the units
(milliseconds, seconds, minutes, or cycles) for time measurement. Notice that when the Reclose 1 Time
and the Pilot settings are zero, the Sequence Controlled Block (SCB), Trip 1 is grayed out. Set the
Reclose 1 Time or Pilot for the first reclose time (other than zero) and the SCB window is now available.
After entering a value, proceed to enter the reclose times for the remaining three reclose attempts. The
total time for all reclose attempts is cumulative. For example, the second reclose attempt is the sum of
Reclose 1 Time or Pilot, and Reclose 2 Time. Reclose three total time would be the sum of the reclose
time for three, two and one (or Pilot). If you want to block the instantaneous or any other protection
element during reclose, check the Sequence Controlled Block 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. Its range is from
0.100 to 600 seconds.
14-18 BE1-700 BESTCOMS Software 9376700990 Rev M