Siemens SIPROTEC 4 7UT6 Series Manual page 58

Functions
2.1 General
autotransformer bank as a separate side in order to establish a current comparison protection for each of the
windings (refer also to
be presented for this side as they would have no meaning for this application. If in an auto-transformer side S3
or S4 is a compensation winding, the mode of connection is always assumed to be "D", and only odd-
numbered vector groups can be selected for these sides.
For the winding assigned to side 3, the following data are relevant:
•
Address 331 UN-PRI SIDE 3 the primary rated voltage (consider regulating range),
•
Address 332 SN SIDE 3 the primary rated apparent power,
•
Address 333 STARPNT SIDE 3the starpoint conditioning,
•
Address 334 CONNECTION S3 the winding connection mode,
•
Address 335 VECTOR GRP S3 the vector group numeral.
For the winding assigned to side 4, the following data are relevant:
•
Address 341 UN-PRI SIDE 4 the primary rated voltage (consider regulating range),
•
Address 342 SN SIDE 4 the primary rated apparent power,
•
Address 343 STARPNT SIDE 4 the starpoint conditioning,
•
Address 344 CONNECTION S4 the winding connection mode,
•
Address 345 VECTOR GRP S4 the vector group numeral.
For the winding assigned to side 5, the following data are relevant:
•
Address 351 UN-PRI SIDE 5 the primary rated voltage (consider regulating range),
•
Address 352 SN SIDE 5 the primary rated apparent power,
•
Address 353 STARPNT SIDE 5 the starpoint conditioning,
•
Address 354 CONNECTION S5 the winding connection mode,
•
Address 355 VECTOR GRP S5 the vector group numeral.
The device automatically computes from these data of the protected transformer and its windings the current-
matching formulae which are required to match the vector group and the different rated winding currents.
The currents are converted such that the sensitivity of the protection always refers to the power rating of the
transformer. In case of different rating of the windings, the rated apparent power of the most powerful
winding is the rated apparent power of the transformer. In general, no circuits are required for matching of
the vector group and no manual calculations for converting of rated current are normally necessary.
Object Data with Generators, Motors and Reactors
Using the 7UT6x for protection of generators or motors, the following must have been set when configuring
the scope of functions (see section Functional Scope, address 105): PROT. OBJECT = Generator/Motor.
These settings also apply for series and shunt reactors if a complete set of current transformers is connected to
both sides. In cases other than that, these settings are not available.
With address 361 UN GEN/MOTOR you inform the device of the primary rated voltage (phase-to-phase) of the
machine to be protected.
The primary rated power set under address 362 SN GEN/MOTOR is the direct primary rated apparent power of
the machine. The power must always be entered as a primary value, even if the device is generally configured
in secondary values. The device calculates the rated current of the protected object and its sides from this
power and the rated voltage. This is the reference for all referred values.
Object Data with Mini-Busbars, Branch-Points, Short Lines (3-phase)
These data are only required if the device is used as 3-phase differential protection for mini busbars or short
lines. When configuring the scope of functions (see Scope of Functions, address 105), the following must
have been set: PROT. OBJECT = 3ph Busbar. In cases other than that, these settings are not available.
58
Figure 2-7 and the respective notes under "Auto-Transformer Banks"), no settings will
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016