Siemens SIPROTEC 7SJ62, Руководство пользователя

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Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
454
3.3.10 Polarity Check for Voltage Input V
4
(only 7SJ623, 7SJ624 and 7SJ64)
only 7SJ623, 7SJ624 and 7SJ64
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 U
en
(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 I
4
(see further down).
only for synchronizing feature in 7SJ623, 7SJ624 and 7SJ64
If the input V
4
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 Funktion 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 synchro-
nized 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 2.19.1.
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 under address
6x01 Synchronizing
x =
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
α
2>
α
1“
and 170.2095
„25
α
2<
α
1“
in the spontaneous messages.
• Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcb's of both voltage transformer cir-
cuits 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
„25 CloseRelease“
, 170.0049). 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 3-36). Both voltage transformers
therefore measure the same voltage.
• For the synchrocheck the program SYNC Function Group 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
„25 CloseRelease“
, 170.0049).
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