Siemens SIPROTEC 4 7UT6 Series Manual page 53

Of the addresses described in the following paragraphs, only those available in your device will be displayed.
Please keep in mind
•
that in 7UT612 only the additional inputs ΙX1 and ΙX3 are available and that they can be assigned to no
more than 2 sides or 3-phase measuring locations,
•
that in 7UT613 and 7UT633 only the additional inputs ΙX1 to ΙX3 are available and that they can be
assigned to no more than 3 sides or 3-phase measuring locations, and
•
that in 7UT635 the auxiliary inputs ΙX1 to ΙX3 cannot be assigned to the measuring location M5, since in
this device either M5 or ΙX1 to ΙX3 are available.
Addresses 251 AUX. CT IX1, 252 AUX. CT IX2, 253 AUX. CT IX3 and 254 AUX. CT IX4 determine to
which side of the main protected object or to which 3-phase measuring location the single-phase measuring
input ΙX1, ΙX2, ΙX3 or ΙX4 is assigned. Set here the side or measuring location, or no assignment at all, as
described above.
High-Sensitivity Additional 1-phase Measuring Locations
Depending on the version, the devices of the 7UT6x family are equipped with 1 or 2 auxiliary high-sensitivity
measuring inputs which can detect currents as low as 3mA present at the input. These inputs can be used for
single-phase overcurrent protection.
The single-phase independent overcurrent protection is suited e.g. for high-sensitivity tank leakage protection
or for a high-impedance differential protection (see Section
highsensitivity measuring input is used.
If you want to use such a high-sensitivity current measuring input, you can specify this to the device at the
addresses 255 and 256.
In 7UT612, input ΙX3 can be used as a high-sensitivity input. In 7UT613 and 7UT633, input ΙX3 can be used as
a high-sensitivity input. Set address 255 AUX CT IX3 TYPE = sensitiv input if you want to use ΙX3 as a
highsensitivity input; otherwise leave the setting 1A/5A input unchanged.
In 7UT635 the input ΙX3 can be used as a high-sensitivity input provided that it is not used for a fifth 3-phase
measuring location, i.e. that only four 3-phase measuring locations are needed. In this case, set address 255
AUX CT IX3 TYPE = sensitiv input, if ΙX3 is used as a high-sensitivity input.
The input ΙX4 is always available as a single-phase input in 7UT635 and can be set at address256 AUX CT
IX4 TYPE as sensitiv input or 1A/5A input.
Assignment of Voltage Measuring Inputs
The 7UT613 and 7UT633 (not the 7UT612 and 7UT635) can be provided with voltage measuring inputs. The
3-phase set of voltage inputs and the fourth voltage input can each be assigned to one side or one measuring
location, or to the busbar voltage (for busbar protection).
Measured voltages can be used in 7UT6x for the overexcitation protection, the undervoltage protection, the
overvoltage protection, the reverse power protection, the forward power monitoring, the frequency protec-
tion, 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 measured 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.
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
2.7 Single-Phase Time Overcurrent
Functions
2.1 General
Protection), if a
53