P54x/EN ST/La4 Settings
(ST) 4-60
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
Leader Select By Leader by Menu
Leader by Menu, Leader by
Opto, Leader by Control
Setting which determines how the preferred leader CB is selected - can be by menu
setting, HMI command or by designated opto input.
If Leader Select By: is set to Leader by Opto, then preferred leader CB is :-
CB1 if input DD B2 Lead is loB(1408) C w, or
CB2 if input DDB (1408) CB2 Lead is high.
If Leader Select By: is set to Leader by Control, then user control setting CTRL CB2
Lead under CB CONTROL in the IED menu determines the preferred leader by applying
set/reset commands (If B2 is leader t then C leader). Set then C ,If Rese B1 is
Select Leader Sel Leader CB1
Sel Leader CB1, Sel
Leader CB2
If Leader Select By is s er by Menu en setting Select et to Lead in the previous cell, th
Leader becomes visible, and determines which CB is the preferred leader.
BF if LFail Cls Enabled Enabled or Disabled
BF if L Fail Cls = Block r reclose if Leader CB Fails to This setting Followe close.
determines whether a follower CB should lock out without reclosing, or continue to reclose,
if the leader CB fails to reclose when the leader CB close command is given.
If BF if L Fail Cls is set ble, follower CB sing is loc if the le ils to to Ena reclo ked out ader fa
close.
If BF if L Fail Cls is set to Disable, the follower CB can continue its reclose cycle if the
leader CB fails to close. (See also setting Dynamic F/L).
Dynamic F/L Disabled Enabled or Disabled
Dynamic F/L = Dynam from follower an auto-reclose ic change to leader status during
cycle if the leader CB fails to close.
If setting BF if Lfail Cls is set to Disabled, then setting Dynamic F/L becomes visible and
determines whether the follower CB should assume leader status and reclose immediately
if the leader CB should fai r whether it sh se l to close, o ould continue as follower and reclo
after the Follower Time delay.
Dynamic F/L set to Enabled selects immediate follower reclose if the leader CB fails to
close;
Dynamic F/L set to Dis cts the follow Follower Time if abled sele er to reclose after the
leader CB fails to close.
AR Shots 1 1 4 1
This setting determines how many reclose attempts (shots) are permitted for any single
fault incident before it is treated as persistent and auto-reclosing is locked out. For
example if AR Shots = 2, a se d reclose attempt i ction retrips con s initiated if the prote
during the reclaim time ne reclose a t lock the prote rips following o ttempt, bu s out if ction ret
during the reclaim time after a second reclose attempt.
Multi Phase AR Allow Autoclose
Allow Autoclose, BAR 2
and 3 ph, BAR 3 phase
This setting determines to-reclosing ase or whether au is permitted or blocked for two ph
three phase faults.
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