•
Circuit breaker is open. The feeder is isolated (zero voltage). 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 NO.
•
Via binary input (No.2906
>Sync. Start AR
) initiate the measuring request. 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 Setting Notes, 2.1.3.1 Setting
Notes and 2.4.2 Setting Notes).
•
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 trans-
formers therefore measure the same voltage.
•
The programAR SYNC-CHECK = YES (address 3515) is set for synchronism check.
•
Via binary input (No.2906
>Sync. Start AR
) initiate the measuring request. The synchronism check
must release closing (message
Sync. release
, No.2951).
[synchronkontrolle-messspannungen-250702-kn, 1, en_GB]
Figure 3-25 Measuring voltages for the synchrocheck — example
•
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 Setting Notes).
When measuring across a transformer, address 214 φ Usy2-Usy1 must also be checked; this must
adapt the vector group (see Section2.1.3.1 Setting Notes). If these are correct, there is probably a reverse
polarity of the voltage transformer terminals forU
sy2
.
•
The program AR Usy1>Usy2< = YES (address 3517) and AR SYNC-CHECK = YES (address 3515) is set
for synchronism check.
•
Open the VT mcb of the measuring point U
sy2
(No. 362
>FAIL:U4 VT
).
•
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
sy2
is not allocated. Check whether this is the required
state, alternatively check the binary input
>FAIL:U4 VT
(No. 362).
•
Reclose the VT mcb of the measuring point U
sy2
.
•
Open the circuit breaker.
•
The program AR Usy1<Usy2> = YES (address 3516) and AR Usy1>Usy2< = NO (address 3517) is set
for synchronism check.
Mounting and Commissioning
3.3 Commissioning
218 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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