Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8-517SA6 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  8OLQH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ϕGLII!” in the spontaneous annunciations.
q Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcbs of both
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 $) is set.
q A request for synchro-check measurement is initiated via binary input (FNo. 
“!6\QF6WDUW”). The synchro-check must give close release (message “6\QF
UHOHDVH”, FNo. ).
Figure 8-24 Measuring voltages for synchro-check
q If not, first check whether one of the aforenamed messages  “6\QF8GLII!”
or  “6\QFϕGLII!” is available in the spontaneous messages.
The message “6\QF8GLII!µ indicates that the magnitude (ratio) adaptation is
incorrect. Check address  8OLQH8V\QF and recalculate the adaptation
factor.
The message “6\QFϕGLII!” indicates that the phase relation of the busbar
voltage does not match the setting under address  8V\QFFRQQHFW (see
Subsection 6.1.1). When measuring across a power transformer, address $
ϕ 8V\QF8OLQH 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.
U
4
4
7SA6
U
line
Feeder
Busbar
Usync

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English