P54x/EN ST/La4 Settings
(ST) 4-56
MiCOM P543, P544, P545, P546
ST
1.3.21 Auto-reclose function
The auto-reclose functionality differs between the P543/P545 and the P544/P546 since the
P y con it breaker, ontrol two.
Accordi
1.3.21.1 A
T
t ectively).
The default PSL includes differential trip, Zone 1 trip and aided trips. In addition, other
dis zones, Aided arison, phase and earth overcurrent protection
a Recl itiate auto-reclose, when required. This is done
in the settings (shown here after). Protection such as voltage, frequency, thermal etc. will
block auto-reclose.
T g shows the relay settings for the auto-reclose function, which must be set in
c aker Control settings under main Menu. The available setting
r
tting
543/P545
can onl trol one circu whereas the P544/P546 can c
ngly, therefore, the settings are different for the two.
uto-reclose function (P543/P545)
he Mi
COM P543/P545 will initiate auto-reclose for fault clearances by any instantaneous
rip allocated in the PSL to DDB Trip Inputs A,B or C (DDB 530,531 or 532 resp
tance DEF, Directional comp
nd Trip On ose (TOR) may be set to in
he followin
onjunction with the Circuit Bre
anges and factory defaults are shown:
Se range
Menu text t setting ze Defaul
Min. Max.
Step si
Single Pole Shot 1 1 4 1
Sets the number of auto lose shots/cycles a able for sin ase faul
ole tripping
-rec pplic gle ph ts.
Care: This setting also applies when auto-reclose is configured in 3 p
applications. Even though the trip m nly, the fact that the
was a singl se fault type is memori
cycle will allow one
recl , plus (N-1) subse nt three pha ots.
out.
ode may be 3 pole o
zed. initiation e pha
In single pole tripping applications, for a setting of “N” shots, the full
single pole trip and osure que se sh
When the number of recurrent single pole faults exceeds the setting, the AR will lock
Three Pole Shot 1 1 4 1
Sets the number of auto-re s/cycles appli re the
nce is 3 Pole. When the number of 3ph
close shot cable for a multiphase fault. Whe
phase selector has identified more than one faulted phase, or has been unable to phase
select only a single phase, the applicable seque
trips exceeds the setting, the AR will lock out.
1 Pole Dead Time 0.5 s 0.05 s 5 s 0.01 s
Sets the dead time (CB open interval) for a single pole auto-reclose cycle, first shot.
D 1 ead Time 0.3 s 0.05 s 30 s 0.01 s
Sets the dead time for the first auto-reclose cycle, except where a single pole trip has
occurred.
Dead Time 2 60 s 1 s 1800 s 1 s
Sets the dead time for the second auto-reclose cycle.
Dead Time 3 60 s 1 s 3600 s 1 s
Sets the dead time for the third auto-reclose cycle.
Dead Time 4 60 s 1 s 3600 s 1 s
Sets the dead time for the fourth auto-reclose cycle.
CB Healthy Time 5 s 1 s 3600 s 1 s
If on completion of the dead time, the CB Healthy input is low, and remains low for a
CB y Time timer, lockout will result circuit r will period given by the
remain open.
Health and the breake
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