ABB REC650 ANSI Technical Manual page 253

1MRK 511 287-UUS A
Technical manual
Initiation of reclosing from CB open information
If a user wants to apply initiation of auto-reclosing from CB open position instead of from
protection trip signals, the function offers such a possibility. This starting mode is selected
by a setting parameter StartByCBOpen = Enabled. One needs then to block reclosing at all
manual trip operations. Typically, one also set CBAuxContType = NormClosed and
connect a CB auxiliary contact of type NC (normally closed, 52b) to inputs 52a and RI.
When the signal changes from CB closed to CB open an auto-reclosing start pulse of
limited length is generated and latched in the function, subject to the usual checks. Then
the reclosing sequence continues as usual. One needs to connect signals from manual
tripping and other functions, which shall prevent reclosing, to the input INHIBIT.
StartByCBOpen = Enabled
RI
ANSI08000078 V1 EN
Figure 108: Pulsing of the pickup inputs
1
AND
100 ms
AND
100 ms
Section 10
Control
pickup
³1
ANSI08000078-1-en.vsd
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