Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8-62 7SA6 Manual
C53000-G1176-C156-2
The synchronism and voltage check must be switched on under address 3501 FCT
Synchronism
.
A further aid for checking in the connection are the messages
2947 “Sync. Udiff>”
and
2949 “Sync. ϕ-diff>” in the spontaneous annunciations.
G Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcbs of both
voltage transformer circuits must be closed.
G The program OVERRIDE = yes (address 3519) must be set for the synchro-check;
the other programs (addresses
3515A to 3518)aresettoNo.
G A request for synchro-check is initiated via binary input (FNo. 2906 “>Sync.
Start
”). The synchro-check must give close release (message “Sync. re-
lease
”, FNo. 2951). If not, check all relevant parameters again (synchro-check
configured and switched on correctly, see sections 5.1, 6.1.1 and 6.15.2).
G Set address 3519 OVERRIDE to No.
G Thenthecircuitbreakerisclosedwhilethelineisolatorisopen(seeFigure8-31).
Both voltage transformers therefore measure the same voltage.
G The program SYNC-CHECK = Yes (address 3515A)isset.
G A request for synchro-check measurement is initiated via binary input (FNo. 2906
“>Sync. Start”). The synchro-check must give close release (message “Sync.
release
”, FNo. 2951).
Figure 8-31 Measuring voltages for synchro-check
G If not, first check whether one of the aforenamed messages 2947 “Sync. Udiff>”
or
2949 “Sync. ϕ-diff>” is available in the spontaneous messages.
The message “Sync. Udiff>” indicates that the magnitude (ratio) adaptation is
incorrect. Check address
215 U-line / Usync and recalculate the adaptation
factor.
The message “
Sync. ϕ-diff>” indicates that the phase relation of the busbar
voltage does not match the setting under address
212 Usync connect. (see
Subsection 6.1.1). When measuring across a power transformer, address
214A
ϕ Usync-Uline
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
Usync.
G For the synchro-check the program Usync< U-line> = Yes (address 3517)and
SYNC-CHECK = Yes (address 3515A)isset.
G Open the VT mcb of the busbar voltage.
U
4
4
7SA6
U
line
Feeder
Busbar
Usync

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English