Siemens SIPROTEC 4 7UT6 Series Manual page 60

Functions
2.1 General
differ from the rated currents of the associated current transformers which latter will be entered at a later
stage (current transformer data).
Additionally, a rated current for the entire busbar as the main protected object can be determined. The
currents of all measuring locations assigned to the main object are converted such that the values of the
differential protection are referred to this rated current of the main protected object, here the busbar. If the
current rating of the busbar is known, set this rated current in address 371 I PRIMARY OP.. If no rated
current of the busbar is defined, you should select the highest of the rated currents of the sides (= feeders). In
Figure 2-12, the rated object current (busbar current) would be 1000 A.
Under address 381 I PRIMARY OP 1 set the rated primary current of feeder 1.
The same considerations apply for the further feeders:
•
Address 382 I PRIMARY OP 2 for feeder 2,
•
Address 383 I PRIMARY OP 3 for feeder 3,
•
Address 384 I PRIMARY OP 4 for feeder 4,
•
Address 385 I PRIMARY OP 5 for feeder 5,
•
Address 386 I PRIMARY OP 6 for feeder 6,
•
Address 387 I PRIMARY OP 7 for feeder 7,
•
Address 388 I PRIMARY OP 8 for feeder 8,
•
Address 389 I PRIMARY OP 9 for feeder 9,
•
Address 390 I PRIMARY OP 10 for feeder 10,
•
Address 391 I PRIMARY OP 11 for feeder 11,
•
Address 392 I PRIMARY OP 12 for feeder 12.
Addresses 388 and 392, are omitted in 7UT612 since this version allows only for 7 feeders. Addresses 390 to
392, are omitted in 7UT613 and 7UT633 since these versions allow only for 9 feeders.
If one 7UT6x is used per phase, set the same rated current and voltage of a feeder for all three devices. For the
identification of the phases for fault annunciations and measured values each device is to be informed on the
phase to which it is assigned. This is to be set in address 396 PHASE SELECTION.
Object Data for Further Protected Objects
The object data described in the previous paragraphs relate to the main protected object whose sides and
measuring locations have been assigned according to Section
further protected objects in your topology, a number of non-assigned measuring locations will be left. The
rated values of these are requested now.
The considerations concerning rated voltages and current are the same as for the main protected object. Only
those of the following addresses will appear during setting which relate to the non-assigned measuring loca-
tions, according to the set topology. Since the main protected object provides at least 2 measuring locations
(differential protection would make no sense with fewer), M1 and M2 will never appear here.
Address 403 I PRIMARY OP M3 requests the rated primary operating current at the measuring location M3
provided this is not assigned to the main protected object.
Address 404 I PRIMARY OP M4 requests the rated primary operating current at the measuring location M4
provided this is not assigned to the main protected object.
Address 405 I PRIMARY OP M5 requests the rated primary operating current at the measuring location M5
provided this is not assigned to the main protected object..
Addresses 403 to 405, are omitted in 7UT612 since this version allows only for 2 measuring locations.
Addresses 404 and 405, are omitted in 7UT613 and 7UT633 since these versions allow only 3 measuring loca-
tions.
Voltage data have only a meaning in 7UT613 or 7UT633 if the device is equipped with voltage inputs. In case
the 3-phase voltage inputs relate to the main protected object, the rated voltages have already been set. But,
if 3-phase voltage measurement is intended at a measuring location which is not assigned to the main
protected object, e.g. in address 261 VT SET a non-assigned Measuring loc.3 is selected, then you have
to enter the rated voltage of this measuring location in address 408 UN-PRI M3. This is a precondition for
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Figure 2-12 shows the example of a busbar with 3 feeders.
2.1.4 Power System Data 1. If you have defined
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016