ABB RED650 - Page 339

• CBREADY: circuit breaker is ready for a reclosing cycle, for example, charged
operating gear.
• CBCLOSED: to ensure that the circuit breaker was closed when the line fault
occurred and start was applied. The CBCLOSED condition must be present for
more that the settable time tCBClosedMin.
• no BLKON or INHIBIT signal is present.
When the start has been accepted, the internal signals “start” and “initiate” are set.
The internal signal “start” is latched and the internal signal “initiate” follows the
length of the signal on the START input. The latched signal “start” can be
interrupted by a signal to the INHIBIT input.
The simplified logic is shown in Figure
152.
The auto recloser is normally started by selective tripping. It is either a zone 1 or
communication aided trip, or a general trip. If the general trip is used the auto
recloser must be blocked, via the INHIBIT input, from all back-up tripping. The
breaker failure function must always be connected to inhibit the auto recloser.
START makes a first shot with synchrocheck conditions to be fulfilled, STARTHS
makes its first shot without any fulfilled synchrocheck conditions. The TRSOTF
“trip by switch onto fault” input starts shots 2 to 5. It may be connected to the
“switch onto fault” output of line protection if multi-shot auto reclosing is used.
In normal circumstances, the auto recloser is started with a protection trip
command which resets quickly due to fault clearing. In case the start signal lasts
for a too long time, the user can set a maximum start pulse duration tLongStartInh.
This start pulse duration time is controlled by setting LongStartInhib. When the
start pulse duration signal is longer than the set maximum start pulse duration, the
auto reclosing sequence will be interrupted in the same way as if the INHIBIT
input was set to true. The logic for the control of long start pulse duration is shown
in Figure
154.
LongStartInhib
OR
AND
AND
longStartI nhib it
IEC16000154-1-en.vsdx
start
initiate
t
tLongStartInh
Extended t1
t13PhExtTimeout
IEC16000154 V1 EN-US
Figure 154: Control of long start pulse duration
If the user wants to start the auto recloser from circuit breaker open position instead
of the protection trip signals, this starting mode is selected by enabling a setting
StartByCBOpen. Typically, a circuit breaker auxiliary contact of type normally
1MRK 505 394-UEN A Section 12
Control
Line differential protection RED650 2.2 IEC 333
Technical manual