Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-61
ST
Setting range
Menu text Default setting
Min. Max.
Step size
Discrim Time 100.0 ms 20 ms 5 second 10 ms
Discrim Time = Discriminating Time. This is a setting which determines whether a fault
on another phase (evolving or developing fault) after single phase trip and
auto-reclose has been initiated by a single phase fault stops the single phase cycle and
starts a three phase aut provide olving fa lt) occurs o-reclose cycle d this second fault (ev u
BEFORE the Discrimina elapsed. It fo nd fault (evolving tion Time rces a lockout if seco
fault) occurs AFTER Discrimination Time has elapsed but before Single Phase Dead Time
elapses.
CB IS Time 100.0 ms 5 s 200 second 100 ms
CB IS Time = CB In Se . This is a tim CB musrvice Time er setting for which a t remain
closed (and optionally the line be live) before it is considered to be In Service.
CB IS MemoryTime 500.0 ms 10 ms 1 second 10 ms
CB IS Memory Time is a timer setting which a state to be llows a CB In Service
remembered for a short owing chang ry switch contacts to period foll eover of the CB auxilia
a CB Open state. This may occasionally be necessary for a few types of CB with
exceptionally fast acting auxiliary switch contacts which allow the auto-reclose scheme
logic to detect the CB opening before it detects a tion operation. n associated protec
DT Start by Prot Protection Reset
Protection Reset ,
Protection Op, Disable
DT Start by Prot = Dead y Prot set to Time Start By Protection action. If DT Start b is
Disable, a dead time st irectly affecte tion or re et, but is art is not d d by protection opera s
enabled by other conditions or events (see settings: 3PDTStart WhenLD and
DTStart by CB Op).
If DT Start by Prot is se ction Op, the bled hen the t to Prote dead time starting is ena w
auto-reclose initiation signal is received from the protection. If DT Start by Prot is set to
Protection Reset, the dead time starting is inhibited until the auto-reclose initiation signal
from the protection resets.
3PDTStart WhenLD Disabled Enabled or Disabled
3PDTStart When LD = three phase auto-reclose dea n the line has gone d time starts whe
dead. If Enabled, the line is required to go dead before a 3 phase auto-reclose dead time
can start. If Disabled, dead time can start when other selected conditions are satisfied,
irrespective of line volts.
DTStart by CB Op Disabled Enabled or Disabled
If Enabled, a dead time start is permitted only when the CB has tripped. If Disabled, a
dead time start is permitted when other selected conditions are satisfied, irrespective of
the CB position.
Dead Line Time 5.0 sec 1.0 sec 9999 s 1.0 sec
When 3PDTStart When LD is Enabled, and the line does not go dead within the set
Dead Line Time period, then the logic will force the auto-reclose sequence to lockout after
. expiry of this time
SP AR Dead Time 500.0 ms 0.0 sec 10 s 10 ms
Dead time setting for single phase auto-reclose.
3P AR DT Shot 1 300.0 ms 10.0 ms 300 s 10 ms
Dead time setting for three phase auto-reclose (first shot).
3P AR DT Shot 2 60.0 s 1.0 s 9999 s 1 s
Dead time setting for three phase auto-reclose (2nd shot).
3P AR DT Shot 3 60.0 s 1.0 s 9999 s 1 s
Dead time setting for three phase auto-reclose (3rd shot).
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