Siemens siprotec 7SA522 User Manual

Installation and Commissioning
8-28 7SA522 Manual
C53000-G1176-C119-2
A further aid for checking in the connection are the messages  "6\QF8GLII!"
and  "6\QFM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UH
OHDVH", 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  29(55,'( to 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 6<1&&+(&. = <HV (address $) is set.
q A request for synchro-check measurement is initiated via binary input (FNo. 
"!6\QF6WDUW"). The synchro-check must give close release (message "6\QF
UHOHDVH", FNo. ).
Figure 8-14 Measuring voltages for synchro-check
q If not, first check whether one of the aforenamed messages  "6\QF8GLII!"
or  "6\QFMGLII!" is available in the spontaneous messages.
The message "6\QF8GLII!µ indicates that the magnitude (ratio) adaptation is
incorrect. Check address  8OLQH8V\QF and recalculate the adaptation
factor.
The message "6\QFMGLII!" indicates that the phase relation of the busbar
voltage does not match the setting under address  8V\QFFRQQHFW (see
Subsection 6.1.1). When measuring across a transformer, address $ M8V
\QF8OLQH 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 8V\QF8OLQH! = <HV (address ) and
6<1&&+(&. = <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. 
"!6\QF6WDUW"). There is no close release. If there is, the VT mcb for the busbar
U
4
4
7SA522
U
line
Feeder
Busbar
Usync

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English