Siemens SIPROTEC 7UT613 series Manual page 63

7UT613/63x Manual
C53000-G1176-C160-2
forward power monitoring, the frequency protection, or for measuring tasks like the
display of voltages or the calculation and output of power and energy metering.
Figure 2-8 shows the various possible voltage assignments (which, of course do not
occur all at the same time in practice). Address 261 must be set to VT SET.
• For voltage measurement at Ua the voltages are measured on Side 1 of the main
protected object.
• For voltage measurement at Ub, the voltages at the Measuring loc.2 are mea-
sured that are assigned to side 1 of the main protected object.
• For voltage measurement at Uc the voltages are measured at the Busbar (only
possible in busbar protection).
• For voltage measurement at Ud, voltages at the Measuring loc.3 are measured
that are not assigned to the main protected object.
• For voltage measurement at Ue the voltages are measured on Side 2 of the main
protected object.
As these examples show, you can select sides, busbars, assigned or non-assigned
measuring locations. In 1-phase busbar protection, voltages can only be measured on
the Busbar.
In practice, the voltage assignment depends therefore on the voltages which the
device is expected to receive and process. Of course, voltage transformers must be
installed at the appropriate locations and connected to the device.
Figure 2-8 Examples of measured voltage assignment
Voltage assignment:
Ua Voltage is measured at side S1 of the main protected object (power transformer)
Ub Voltage is measured at the measuring location M2, assigned to side 1 of the main pro-
tected object
Uc Voltage is measured at a busbar
Ud Voltage is measured at the non-assigned measuring location M3
Ue Voltage is measured at side S2 of the main protected object (power transformer)
2.1 General
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