MC2-30T
Doc. N°
MO-0483-ING
Copyright 2016
Date
17.03.2022
Rev.
2
Pag. 44
of
70
17.15.1 - Description of variables
Enab.
: Function enabling (No = Disable / Yes = Enable)
ShNum
: Number of Shots available in one Autoreclosure Cycle
R1I>
: Allows to select one or more of the Shots of a Cycle to
be initiated by tripping of the function..................:
1I>
R2I>
: Same as above.......................................................: 2I>
R3I>
: Same as above.......................................................: 3I>
R1Io>
: Same as above.......................................................: 1Io>
R2Io>
: Same as above.......................................................: 2Io>
R3Io>
: Same as above.......................................................: 3Io>
GR1-2
: Change-over SetGroup 1 to SetGroup 2
SeqC
: Sequence coordination
tSeqC
: Sequence coordination time
t1
: Reclosure time
of 1st AR shot
Tr1
: Reclaim time
Td1
: Discrimination
t2
: Reclosure time
of 2nd AR shot
Tr2
: Reclaim time
Td2
: Discrimination
t3
: Reclosure time
of 3rd AR shot
Tr3
: Reclaim time
Td3
: Discrimination
t4
: Reclosure time of 4th AR shot
Tr4
: Reclaim time
TrCL
: Reclaim time on manual closure
ThExt
: Hold of lock-out signal after removal of external lock-out
17.15.2 – Definitions
Shot Number (ShNum = 0, 1, 2, 3, 4):
Number of autoreclosure commands that can be issued in a Reclosure cycle before lock-out.
Selection of the reclose shot of a cycle (R1, R2, ....) that can be initiated by the tripping of selectable
protection elements (1I<, 2I>, ....).
Set Group Change-over (GR1-2):
Determines the reclosure shot in a cycle after switch the relay automatically switches from setting group 1
to setting group 2.
At the end of the reclaim time “Tr” the setting group 1 is automatically restored.
Sequence Coordination (SeqC), (tSeqC):
When “SeqC” is set to “enable”, it allows the reclose element to count any downstream recloser operation,
taking place within the sequence coordination time “tSeqC”, as its own, thereby preventing unnecessary
operations of the back-up device for a fault beyond the downstream device. This is particularly useful
when the back-up breaker feeds several branch reclosers, only one of which is experiencing a fault.
Reclosure time (t1, t2, t3, t4):
It is the reclose dead time before a reclosure command (R1, R2, R3, R4) is issued after C/B opening.
Reclaim time (Tr1, Tr2, Tr3, Tr4):
It is the reclaim time started after any automatic reclosure command.
Any initiation signal (trip of enabled protection or seqC function) detected during “Trx” starts the next
autoreclosure shot of the cycle.
Any initiation signal detected during “Trx” after the last shot of the reclose cycle, produces the lock-out
status.
Discrimination time (Td1, Td2, Td3):
Any new trip detected after a automatic reclosure shot, during the time “Tdx” (Td<Tr) produces the “lock-
out” status with display information “Failed Reclosure”.
Reclaim time after manual closure (TrCL):
It is the reclaim time started after a manual closure of the C/B.
Tripping of any protection element detected during “TrCL”, produces the lock-out status.
Tripping of an “enabled” protection, shows the display “Failed” Reclosure.
Holding time of the external lock-out signal (ThExt):
The digital input programmed to detected an external reclosure lock-out signal, remains activated for the
time the signal is present plus the holding time “ThExt” from the external signals removal.
