Siemens siprotec SJ62, Руководство пользователя

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3 Mounting and Commissioning
431
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Important! Make sure that pickup values that have been changed for testing are set
back to the valid settings!
3.3.10 Polarity Check for Voltage Input V
4
(only 7SJ64)
Only 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 sub-
section is irrelevant.
If input V
4
is used for measuring the Displacement Voltage U
N
(Power System Data
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
4
(see further down).
Only for Synchro-
nism and Voltage
Check in 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 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 2.19.1.
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 Synchronizing
x =
ON
.
An additional help for the connection control are the annunciations 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 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
).