AND
AND
AND
OR
OR
RI
52a
initiate
en05000787_ansi.vsd
CLOSECMD
S
R
Q
CBClosed
0
0-tAutoContWait
ANSI05000787 V1 EN
Figure 320: Automatic proceeding of shot 2 to 5
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.
Section 12 1MRK505222-UUS C
Control
642
Technical reference manual
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