Polarity Check For The Voltage Input U - Siemens SIPROTEC 4 7VK61 Manual

[lastscheinleistung-110402-wlk, 1, en_GB]
Figure 3-24
The power measurement provides an initial indication as to whether the measured values have the correct
polarity. 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.
Finally, switch off the protected power line.

Polarity Check for the Voltage Input U

3.3.8
Depending on the application of the voltage measuring input U
measuring voltage is connected to this input, this section is irrelevant.
If the input U is used for measuring a voltage for overvoltage protection (P.System Data 1 address 210 U4
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 is used for the measurement of the displacement voltage U
4
U4 transformer = Udelta transf.), the polarity together with the current measurement is checked (see
below).
If input U is used for measuring a voltage for synchronism check (P.System Data 1 address 210 U4
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
The synchronisation voltage U
2.1.3.1 Setting
If there is no transformer between the two measuring points, address 214 φ Usy2-Usy1 must be set to0°
(see Section 2.1.3.1 Setting
If the measurement is made across a transformer, this angle setting must correspond to the phase rotation
resulting from the vector group of the transformer (see also the example in
If necessary, different transformation ratios of the transformers may have to be considered from both meas-
uring points U
sy1
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
diff> in the spontaneous annunciations.
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Apparent Load Power
2.1.1.2 Setting
must be entered correctly at address 212 Usy2 connection (see Section
sy2
Notes).
Notes).
and U at address 215 Usy1/Usy2 ratio.
sy2
4
, a polarity check may be necessary. If no
4
(P.System Data 1 address 210
en
Notes).
Section2.1.3.1 Setting
Sync. Udiff> and 2949 Sync. φ-
Mounting and Commissioning
3.3 Commissioning
Notes).
217