Siemens SIPROTEC, Manual

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Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
551
• The above described tests of the measured quantities also have to be performed at the other end of the
tested current path. The current and voltage values as well as the phase angles of the other end can also
be read out locally as percentage values. Please observe that currents flowing through the object (without
charging currents) ideally have opposite signs at both ends, i.e. they are turned by 180°. In the „WEB-Mon-
itor“, the local and remote measured values can be shown graphically. An example is shown in Figure 3-30.
• The protected object is now switched off, i.e. the circuit breakers are opened.
Polarity check for voltage input U
4
Depending on the application of the voltage measuring input U
4
, a polarity check may be necessary. If no mea-
suring voltage is connected to this input, this section is irrelevant.
If input U
4
is used for measuring a voltage for overvoltage protection (
P.System Data 1
address
210 U4
transformer
=
Ux transformer
), no polarity check is necessary because the polarity is irrelevant here.
The voltage magnitude was checked before.
If input U
4
is used for the measurement of the displacement voltage U
en
(
P.System Data 1
address
210 U4
transformer
=
Udelta transf.
), the polarity is checked together with the current test (see below).
If input U
4
is used for measuring a busbar voltage for synchronism check (
P.System Data 1
address
210
U4 transformer
=
Usy2 transf.
), the polarity must be checked as follows using the synchronism check
function:
Only for Synchronism Check
The device must be equipped with the synchronism and voltage check function which must be configured under
address
135 Enabled
(see section 2.1.1.3).
The synchronisation voltage U
sy2
must be entered correctly at address
212 Usy2 connection
(see Section
2.1.2.1).
If there is no transformer between the two measuring points, address
214
ϕ
Usy2-Usy1
must be set to
0
°
(see Section 2.1.2.1).
If the measurement is made across a transformer, this angle setting must correspond to the phase rotation re-
sulting from the vector group of the transformer (see also the example in section 2.1.2.1).
If necessary, different transformation ratios of the transformers may have to be considered from both measuring
points U
sy1
and U
sy2
at address
215 Usy1/Usy2 ratio
.
The synchronism and voltage check must be switched
ON
under address
3501 FCT Synchronism
.
An additional help for the connection check are the messages 2947
„Sync. Udiff>“
and 2949
„Sync.
ϕ
-
diff>“
in the spontaneous annunciations.
• Circuit breaker is open. The feeder is isolated (zero voltage). The VTmcb's of both voltage transformer cir-
cuits must be closed.
• For the synchronism check the program
AR OVERRIDE
=
YES
(address
3519
) is set; the other programs
(addresses
3515
through
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 2.1.1.3, 2.1.2.1 and 2.18.2).
• Address
3519 AR OVERRIDE
must be set to
NO
.
• Then the circuit breaker is closed while the line isolator is open (see Figure 3-32). Both voltage transformers
therefore measure the same voltage.
• The program
AR SYNC-CHECK
= (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).