Installation and Commissioning
8-28
7SA522 Manual
C53000-G1176-C119-2
A further aid for checking in the connection are the messages
"
and
" in the spontaneous annunciations.
q
Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcb
s
of both
voltage transformer circuits must be closed.
q
The program
\HV
(address
) must be set for the synchro-check;
the other programs (addresses
$
to
) are set to
1R
.
q
A request for synchro-check is initiated via binary input (FNo.
"). The synchro-check must give close release (message "
", FNo.
). If not, check all relevant parameters again (synchro-check
configured and switched on correctly, see sections 5.1, 6.1.1 and 6.12.2).
q
Set address
1R
.
q
Then the circuit breaker is closed while the line isolator is open (see fig. 8-14). Both
voltage transformers therefore measure the same voltage.
q
The program
<HV
(address
$
) is set.
q
A request for synchro-check measurement is initiated via binary input (FNo.
"
"). The synchro-check must give close release (message "
", FNo.
).
Figure 8-14
Measuring voltages for synchro-check
q
If not, first check whether one of the aforenamed messages
"
or
"
" is available in the spontaneous messages.
The message "
indicates that the magnitude (ratio) adaptation is
incorrect. Check address
and recalculate the adaptation
factor.
The message "
" indicates that the phase relation of the busbar
voltage does not match the setting under address
(see
Subsection 6.1.1). When measuring across a transformer, address
$
must also be checked; this must adapt the vector group (see Subsec-
tion 6.1.1). If these are correct, there is probably a reverse polarity of the voltage
transformer terminals
8V\QF
.
q
For the synchro-check the program
=
<HV
(address
) and
<HV
(address
$
) is set.
q
Open the VT mcb of the busbar voltage.
q
A request for synchro-check measurement is initiated via binary input (FNo.
"
"). There is no close release. If there is, the VT mcb for the busbar
U
4
4
7SA522
U
line
Feeder
Busbar
Usync
Содержание siprotec 7SA522
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