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Mounting and Commissioning
3.3 Commissioning
Figure 3-24
The power measurement provides an initial indication as to whether the measured values have the correct po-
larity. If both the active power as well as the reactive power have the wrong sign, the polarity in address 201 CT
Starpoint must be checked and rectified.
3.3.8
Polarity Check for the Voltage Input U
Depending on the application of the voltage measuring input U
suring voltage is connected to this input, this section is irrelevant.
If the input U
4
transformer = Ux transformer), no polarity check is necessary because the polarity is irrelevant here.
The voltage magnitude was checked before.
If the input U
4
U4 transformer = Udelta transf.), the polarity together with the current measurement is checked (see
below).
is used for measuring a voltage of the synchronism check (P.System Data 1 address 210 U4
If input U
4
transformer = Usy2 transf.), the polarity must be checked as follows using the synchronism check func-
tion:
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 2.1.1.2).
The synchronisation voltage U
2.1.3.1).
If there is no transformer between the two measuring points, address 214 ϕ Usy2-Usy1 must be set to 0°
(see Section 2.1.3.1).
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 2.1.3.1).
If necessary, different transformation ratios of the transformers may have to be considered from both measuring
points U
and U
sy1
The synchronism and voltage check must be switched under address 3501 FCT Synchronism .
222
Apparent Load Power
is used for measuring a voltage for overvoltage protection (P.System Data 1 address 210 U4
is used for the measurement of the displacement voltage U
must be entered correctly at address 212 Usy2 connection (see Section
sy2
at address 215 Usy1/Usy2 ratio.
sy2
4
, a polarity check may be necessary. If no mea-
4
(P.System Data 1 address 210
en
C53000-G1176-C159-3, Release date 05.2009
SIPROTEC, 7VK61, Manual
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