ABB Relion 650 Series Technical Manual page 315

1MRK 506 326-UUS B
An auto-reclosing open time extension delay,
delay. It is intended to come into use if the communication channel for permissive line protection
is lost. In such a case there can be a significant time difference in fault clearance at the two ends
of the line. A longer "auto-reclosing open time" can then be useful. This extension time is
controlled by setting parameter
10.3.6.5 Long trip signal
In normal circumstances the trip command resets quickly due to fault clearing. The user can set a
maximum trip pulse duration
extended by
sequence in the same way as a signal to input INHIBIT.
Extended t1
PLCLOST
initiate
pickup
ANSI10000255 V1 EN-US
Figure 159: Control of extended auto-reclosing open time and long trip pulse detection
10.3.6.6 Reclosing checks and the reset timer
When dead time has elapsed during the auto-reclosing procedure certain conditions must be
fulfilled before the CB closing command is issued. To achieve this, signals are exchanged between
program modules to check that these conditions are met. In three-phase reclosing a synchronizing
and/or energizing check can be used. It is possible to use a synchronism check function in the
same physical device or an external one. The release signal is configured by connecting to the
auto-reclosing function input SYNC. If reclosing without checking is preferred the SYNC input can
be set to TRUE (set high). At confirmation from the synchronism check, or if the reclosing is of
single-phase, the signal passes on.
By choosing
breaker is also checked before issuing the CB closing command. If the CB has a readiness contact
CBReadyType = OCO (CB ready for an Open-Close-Open sequence) this condition may not
of type
be complied with after the tripping and at the moment of reclosure. The Open-Close-Open
condition was however checked at the start of the reclosing cycle and it is then likely that the CB is
prepared for a Close-Open sequence.
The synchronism check or energizing check must be fulfilled within a set time interval,
not, or if other conditions are not met, the reclosing is interrupted and blocked.
Line distance protection REL650
Technical manual
Extended t1 = Disabled and the input PLCLOST.
tTrip . When trip signals are longer, the auto-reclosing open time is
tExtended t1 . If Extended t1 = Disabled , a long trip signal interrupts the reclosing
AND
0-tTrip
0
CBReadyType = CO (CB ready for a Close-Open sequence) the readiness of the circuit
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tExtended t1 , can be added to the normal shot 1
OR
AND
AND
GUID-692AE512-FEB6-4E99-865D-20530B5CEF91 v1
Extend t1
AND
long duration
AND
(block STBRREC)
ANSI10000255-1-en.vsd
GUID-5C40FCB8-29F1-4DB4-9EE9-A1EEEB3B3CCB v1
tSync . If it is
Section 10
Control
309