Siemens siprotec 7SA6 User Manual page 595

7SA6 Manual
C53000-G1176-C133-1
If necessary different transformation ratios of the voltage transformers on the busbar
and the feeder may have to be considered under address  8OLQH  8V\QF.
The synchronism and voltage check must be switched RQ under address  )&7
6\QFKURQLVP.
A further aid for checking in the connection are the messages   "6\QF 8GLII!"
and   "6\QF ϕGLII!" in the spontaneous annunciations.
q
Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcb
voltage transformer circuits must be closed.
q
The program 29(55,'( = \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.   "!6\QF
6WDUW"). The synchro-check must give close release (message "6\QF
UHOHDVH", FNo.  ). If not, check all relevant parameters again (synchro-check
configured and switched on correctly, see sections 5.1, 6.1.1 and 6.13.2).
q
Set address  29(55,'( to 1R.
q
Then the circuit breaker is closed while the line isolator is open (see Figure 8-24).
Both voltage transformers therefore measure the same voltage.
q
The program 6<1&&+(&. = <HV (address $) is set.
q
A request for synchro-check measurement is initiated via binary input (FNo.  
"!6\QF 6WDUW"). The synchro-check must give close release (message "6\QF
UHOHDVH", FNo.  ).
4
U
line
Feeder
Measuring voltages for synchro-check
Figure 8-24
q
If not, first check whether one of the aforenamed messages   "6\QF 8GLII!"
or   "6\QF ϕGLII!" is available in the spontaneous messages.
The message "6\QF 8GLII!µ indicates that the magnitude (ratio) adaptation is
incorrect. Check address  8OLQH  8V\QF and recalculate the adaptation
factor.
The message "6\QF ϕGLII!" indicates that the phase relation of the busbar
voltage does not match the setting under address  8V\QF FRQQHFW (see
Subsection 6.1.1). When measuring across a power transformer, address $
ϕ 8V\QF8OLQH must also be checked; this must adapt the vector group (see
Subsection 6.1.1). If these are correct, there is probably a reverse polarity of the
voltage transformer terminals 8V\QF.
Installation and Commissioning
Usync
U
4
7SA6
of both
s
Busbar
8-51