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An additional for checking the connections are the messages 2947 „Sync. Udiff>" and 2949 „Sync. ϕ-
diff>" in the spontaneous annunciations.
• The circuit breaker is open. The feeder is de-energised. The VTmcb's of both voltage transformer circuits
must be closed.
• For the synchronism check the program AR OVERRIDE = YES (address 3519) is set; the other programs
(addresses 3515 to 3518) are set to .
• Via binary input (no. 2906 „>Sync. Start AR") a measuring request is entered. The synchronism check
must release closing (message „Sync. release", No. 2951). If not, check all relevant parameters again
(synchrocheck configured and enabled correctly, see Sections 2.1.1.2, 2.1.3.1 and 2.4.2).
• Address 3519 AR OVERRIDE must be set to NO.
• Then the circuit breaker is closed while the line isolator is open (see figure 3-25). Both voltage transformers
thus obtain the same voltage.
• The program AR SYNC-CHECK = (address 3515) is set for synchronism check.
• Via binary input (no. 2906 „>Sync. Start AR") a measuring request is entered. The synchronism check
must release closing (message „Sync. release", No. 2951).
Figure 3-25
• If not, first check whether one of the before named messages 2947 „Sync. Udiff>" or 2949 „Sync. ϕ-
diff>" is available in the spontaneous messages.
The indication „Sync. Udiff>" indicates that the magnitude (ratio) adaptation is incorrect. Check address
215 Usy1/Usy2 ratio and recalculate the adaptation factor, if necessary.
The indication „Sync. ϕ-diff>" indicates that the phase relation, in this example of the busbar voltage,
does not match the setting at address 212 Usy2 connection (see Section 2.1.3.1). When measuring
across a transformer, address 214 ϕ Usy2-Usy1 must also be checked; this must adapt the vector group
(see Section 2.1.3.1). If these are correct, there is probably a reverse polarity of the voltage transformer ter-
minals for U
• The program AR Usy1>Usy2< = YES (address 3517) and AR SYNC-CHECK = (address 3515) is set for
synchronism check.
• Open the VT mcb of the measuring point U
• Via binary input (no. 2906 „>Sync. Start AR") a measuring request is entered. There is no close release.
If there is, the VT mcb for the measuring point U
alternatively check the binary input „>FAIL:Usy2 VT" (no. 362).
• Reclose the VT mcb of the measuring point U
• Open the circuit breaker.
• The program AR Usy1<Usy2> = YES (address 3516) and AR Usy1>Usy2< = (address 3517) is set for
synchronism check.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Measuring voltages for the synchronism check
.
sy2
(No. 362 „>FAIL:Usy2 VT").
sy2
is not allocated. Check whether this is the required state,
sy2
.
sy2
Mounting and Commissioning
3.3 Commissioning
223
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