Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-143
OP
4.1.7.6 System check on shot 1 (P543/P545)
The SysChk on Shot 1 setting is used to Enable/Disable system checks for the first reclose
after a 3 pole trip in an auto-reclose cycle. When the SysChk on Shot 1 is set to Disabled
no system checks are required for the first reclose which may be preferred when high speed
auto-reclose is applied to avoid the extra time for a system check. Subsequent reclose
attempts in a multi-shot cycle will still require a system check.
4.1.7.7 Immediate auto-reclose with check synchronism (P543/P545)
The CS AR Immediate setting allows immediate auto-reclosure without waiting for the expiry
of the settable dead time, provided the check synchronism conditions are met and a fault is
not detected. The intention is to allow the local end to reclose immediately if the remote end
has already reclosed successfully and the synchronizing conditions are met.
This feature applies when the setting is enabled. It applies to all dead times, just for three
pole auto-reclose and just for Live Line-Live Bus condition (plus other check synchronizing
conditions of phase angle, frequency etc).
When set to disabled the relay will wait for the relevant dead time.
4.1.7.8 Discrimination timer setting (P543/P545)
A single-phase fault can result in a single-phase trip and a single-pole auto-reclose cycle will
be started, however the fault may evolve during the dead time to affect another phase. For
an evolving fault, the protection issues a three-phase trip.
The discrimination timer starts simultaneously with the dead time timer, and is used to
discriminate from which point in time an evolving fault is identified as no longer one
continued evolution of the first fault, but is now a discrete second fault condition. If the
evolving fault occurs before the expiry of the discrimination time, the protection will start a
three-pole auto-reclose cycle if permitted. If however, the second phase fault occurs after
the discrimination time, the automatic reclose function is blocked, and driven to AR Lockout.
4.1.8 Auto-reclose logic diagrams (P543/P545)
P1089ENa
P1098ENd
Command (from IEC60670-5-103 only)
DDB AR (on/off) pulse
1382 & 1383
DDB AR In service (1384)
DDB En 1 pole reclose (449)
Enabled
Disabled
Enabled
Disabled
1
&
&
1
1
Enabled
Disabled
DDB En 3 pole reclose (450)
1
&
Three pole A/R
SETTING CB control
Single pole A/R
SETTING CONFIGURATION
AUTO-RECLOSE
HMI Command
ARC Status
Note 1
SETTING CB control
DDB A/R Status 1 P (857)
DDB A/R Status 3 P (856)
DDB A/R in
Int Signal
Force 3 P
Service(1385)
Note: Default AR Command is ON
Figure 90 Auto-reclose enable logic
To Next Page
Loading...
