Polarity Check for Voltage Input V
4
(ony 7SJ623, 7SJ624, 7SJ625, 7SJ626 and
7SJ64)
Polarity Check for Voltage Input
Depending on the application of the voltage measuring input V
4
of a 7SJ64, a polarity check may be necessary.
If no measuring voltage is connected to this input, this subsection is irrelevant.
If input V
4
is used for the measurement of the displacement voltage V
0
(Power System Data 1 Address 213
VT Connect. 3ph = Vab, Vbc, VGnd or Van,Vbn,Vcn,VGn), the polarity is checked together with the
current measurement Ι
4
(see further down).
only for synchronization function in 7SJ623, 7SJ624, 7SJ625, 7SJ626 and 7SJ64
If the input V4 is used for measuring a voltage for synchronism check (Power System Data 1, Address 213 VT
Connect. 3ph = Van,Vbn,Vcn,VSy), the following is to be observed:
•
The single-phase voltage V
2
needed for synchronization is to be connected to input V
4
.
•
The polarity must be checked as follows using the synchronism check function:
The device must be equipped with the synchronism and voltage check which is to be configured in address
16x = SYNC Funkton x = SYNCHROCHECK.
Voltage V
2
needed for synchronization is to be set correctly in address 6x23 CONNECTIONof V2.
If a transformer is located between the measuring points of reference voltage V
1
and the voltage to be
synchronized V
2
, its phase rotation must be taken into consideration. For this purpose an angle corresponding
to the transformer vector group is entered in address 6x22 ANGLE ADJUSTM.. The angle is set in direction
busbar viewed from the feeder. An example is shown in Subsection 2.21.1 SYNC Function group 1.
If necessary different transformation ratios of the transformers on the busbar and the feeder may have to be
considered under address Balancing V1/V2.
The synchronism and voltage check must be switched under address 6x01 Synchronizingx = ON.
A further aid for checking in the connection are the messages 170.2090
25 V2>V1
, 170.2091
25 V2<V1
,
170.2094
25 α2>α1
and 170.2095
25 α2<α1
in the spontaneous messages.
•
Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcb's of both voltage transformer
circuits must be closed.
•
For the synchrocheck the program Direct CO is set to YES (address 6x10); the other programs
(addresses 6x07 to 6x09) are set to NO.
•
Via binary input (170.0043
>25 Sync req.
) initiate the measuring request. The synchronization check
must release closing (message 170.0049
25 CloseRelease
). If not, check all relevant parameters
again (synchrocheck configured and enabled correctly, see Sections 2.1.1 Functional Scope and
2.21.1 SYNC Function group 1).
•
Set address 6x10 Direct CO to NO.
•
Then the circuit breaker is closed while the line isolator is open (see Figure 3-38). Both voltage trans-
formers therefore measure the same voltage.
•
For the synchrocheck the program SYNC-Funktionsgruppe X is set to ASYN/SYNCHRON (address 016x)
(only applies to 7SJ64).
•
Via binary input (170.0043
>25 Sync req.
) initiate the measuring request. The synchronism check
must release closing (message 170.0049
25 CloseRelease
).
3.3.10
Mounting and Commissioning
3.3 Commissioning
SIPROTEC 4, 7SJ62/64, Manual 427
C53000-G1140-C207-8, Edition 08.2016
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