Polarity Check For Voltage Input; Only 7Sj64) - Siemens siprotec SJ62 User Manual

3 Mounting and Commissioning
3.3.10 Polarity Check for Voltage Input V
Only 7SJ64
Only for Synchro-
nism and Voltage
Check in 7SJ64
431
Important! Make sure that pickup values that have been changed for testing are set
back to the valid settings!
Depending on the application of the voltage measuring input V
check may be necessary. If no measuring voltage is connected to this input, this sub-
section is irrelevant.
If input V is used for measuring the Displacement Voltage U
4
1 address 213 VT Connect. 3ph = Vab, Vbc, VGnd or Van,Vbn,Vcn,VGn), the
polarity is checked together with the test of current input I
If the input V is used for measuring a voltage for synchronism check (Power System
4
Data 1, address 213 VT Connect. 3ph = Van,Vbn,Vcn,VSy), the following is to
be observed:
• The single-phase voltage V
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 Funktion x = SYNCHROCHECK.
needed for synchronization is to be set correctly in address 6x23
Voltage V
2
CONNECTIONof V2.
If a transformer is located between the measuring points of reference voltage V
the voltage to be synchronized V
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 2.19.1.
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 6x01 Synchronizingx = ON.
An additional help for the connection control are the annunciations 170.2090 „25
V2>V1", 170.2091 „25 V2<V1", 170.2094 „25 α2>α1" and 170.2095 „25
α2<α1" in the spontaneous annunciations.
• 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 6x10A); the
other programs (addresses 6x07 to 6x09) are set to NO.
• Via binary input (2906 „>25 Measu. Only") initiate the measuring request. The
synchronism check must release closing (message „25 CloseRelease", 2951).
If not, check all relevant parameters again (synchrocheck configured and enabled
correctly, see Sections 2.1.1 and 2.19.1).
• Set address 6x10 Direct CO to NO.
• Then the circuit breaker is closed while the line isolator is open (see Figure 3-37).
Both voltage transformers therefore measure the same voltage.
• For the synchrocheck the program SYNC-Functional Groups X is set to
ASYN/SYNCHRON (address 016x).

(only 7SJ64)

4
needed for synchronization is to be connected to input
2
, its phase rotation must be taken into consideration.
2
of a 7SJ64, a polarity
4
(Power System Data
N
(see further down).
4
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
and
1