Siemens SIPROTEC 7UT613 series Manual page 62

2 Functions
High-Sensitivity
Additional 1-phase
Measuring Loca-
tions
Assignment of the
Voltage-measuring
Inputs
62
• 4th and 5th case: In these cases you set the parameter for the assignment of the
auxiliary measuring location to conn/not assig. (connected but not assigned).
The auxiliary measuring location is then assigned to neither a specific side of the
main protected object nor to any other 3-phase measuring location. These protec-
tion and measuring functions do not need any information on their assignment to a
3-phase measuring location because they only process 1-phase currents.
• General advice: If you want to use a 1-phase auxiliary measuring location both for
a function as per the 3rd to 5th case and for the 1st or 2nd case, you must of course
assign it as described in the 1st and 2nd case.
If the device is equipped with a 1-phase measuring input but you do not need it, leave
the setting Not connected unchanged (not connected).
Of the addresses described in the following paragraphs, only those available in your
device will be displayed. Please keep in mind
• that in 7UT613 and 7UT633 only the auxiliary inputs IX1 to IX3 are available, and
that they can be assigned to not more than 3 sides or 3-phase measuring locations;
• that in 7UT635 the auxiliary inputs IX1 to IX3 cannot be assigned to the measuring
location M5, since in this device either M5 or IX1 to IX3 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 IX1, IX2, IX3 or IX4 is
assigned. Set the side or measuring location, or no assignment at all, as described
above.
Depending on the version, the devices of the 7UT613/63x 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 pro-
tection.
The single-phase independent overcurrent protection is suited e.g. for high-sensitivity
tank leakage protection or for a high-impedance differential protection (cf. section 2.7),
if a high-sensitivity 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 7UT613 and 7UT633, input IX3 can be used as a high-sensitivity input. Set address
255 AUX CT IX3 TYPE to sensitiv input if IX3 is used as a high-sensitivity input;
otherwise leave the setting 1A/5A input unchanged.
In 7UT635 the input IX3 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 lo-
cations are needed. In this case, set address 255 AUX CT IX3 TYPE = sensitiv
input, if IX3 is used as a high-sensitivity input.
The input IX4 is always available as a single-phase input in 7UT635 and can be set at
address 256 AUX CT IX4 TYPE as sensitiv input or 1A/5A input.
The 7UT613 and 7UT633 (not the 7UT635) can be provided with voltage measuring
inputs. The 3-phase set of voltage inputs and the fourth voltage input can each be as-
signed to one side or one measuring location or to the busbar voltage (for busbar pro-
tection).
Measured voltages can be used in 7UT613/63x for the overexcitation protection, the
undervoltage protection, the overvoltage protection, the reverse power protection, the
7UT613/63x Manual
C53000-G1176-C160-2