P54x/EN ST/La4 Settings
(ST) 4-58
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
N>2 to IN>4 Cells
as for N>1 Above
Mult Phase AR BAR 3 Phase
BAR 3 Phase/BAR 2 and 3 Phase/Allow
AR
Setting that determines impact of any multiphase fault on AR operation. If, for example,
nd 3 Phase’ is d, the AR will be ked for an hase fa AR 3
hase combinations may be permitted to
‘BAR 2 a selecte bloc y multip ult. If ‘B
Phase’ is selected, the AR will be blocked only for faults affecting all three phases together
(A-B-C).
The ‘Allow AR’ selection is used where all faulted p
initiate an auto-reclose sequence.
Dead Time Start Protection Operation
Protection Operation or
Protection Reset
N/A
Setting that determines whether the dead time is started when the protection operates o
when the protection trip command resets.
r
Discrim. Timer 0.1 s 0.1 s 5 s 0.01 s
Pick up time delay after which any evolving fault during the dead time will be considere
as a second (new) fault. If an evolving fault occurs while the timer is still running, the fo
d
rce
ignal ed and the ‘1 is running following
le trip nd start ‘Dea
3 ph trip internal s
the initial single po
will be issu
will stop a
Pole Dead Time’ that
d Time 1’ instead.
ISEF>1 AR No Action No action, Block AR or Initiate AR
Setting that determines impact of the first stage sensitive earth fault overcurrent pro
on AR operation.
tection
SEF>2 to ISEF>4
Cells as for SEF>1
Above
SYSTEM CHECKS
CS1 Close Enable Disabled Enabled or Disabled N/A
Enables auto-reclo
system satisfies the
se with che chronization. Only allows aut ose when the
Ch Stage 1 sett
ck syn
eck Sync.
o-recl
ings.
CS2 Close Enable Disabled Enabled or Disabled N/A
Enables auto-reclo
system satisfies t
se with check synchronization. Only allows aut ose wh
he Ch ync. Stage 2 settings
o-recl en the
eck S
LiveLine/Dead Bus Disabled Enabled or Disabled N/A
Enables auto-reclose with Live (hot) line and Dead busbar.
DeadLine/LiveBus Disabled Enabled or Disabled N/A
Enables auto-reclose with Dead line and Live (hot) busbar.
DeadLine/Dead Bus Disabled Enabled or Disabled N/A
Enables auto-reclose w ne and Deadith Dead li busbar.
C/S AR Immediate Disabled Enabled or Disabled N/A
When enabled this setting allows the set dead time to be bypassed, b
repeat re-closer function. Provided th
y implementing a
at both line ends have cleared the fault, the line will
the line is then energized fr emote st, the lin
On of a live line, in synchronism e local b
have gone dead. If
become live again.
om the r end fir
with th
e will
us, detection
immediate re-closing can be permitted.
Sys. Chk. on Shot 1 Enabled Enabled or Disabled N/A
Can be used to disable system checks on the first auto-reclose shot.
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