Siemens SIPROTEC 7UT613 series Manual page 73

7UT613/63x Manual
C53000-G1176-C160-2
Similar applies for the further measuring locations (assigned or non-assigned to the
main protected object). Only those addresses will appear during setting which are
available in the actual device version.
Measuring Location 2
• Address 521 STRPNT->OBJ M2 starpoint position of CTs for measuring location
M2,
• Address 522 IN-PRI CT M2 prim. rated current of CTs for measuring location M2,
• Address 523 IN-SEC CT M2 sec. nominal current CT for measuring location M2,
Measuring Location 3
• Address 531 STRPNT->OBJ M3 starpoint position of CT for measuring location M3,
• Address 532 IN-PRI CT M3 prim. rated current of CTs for measuring location M3,
• Address 533 IN-SEC CT M3 sec. nominal current CT for measuring location M3,
Measuring Location 4
• Address 541 STRPNT->OBJ M4 starpoint position of CT for measuring location M4,
• Address 542 IN-PRI CT M4 prim. rated current of CTs for measuring location M4,
• Address 543 IN-SEC CT M4 sec.. rated current of CTs for measuring location M4.
Measuring Location 5
• Address 551 STRPNT->OBJ M5 starpoint position of CTs for measuring location
M5,
• Address 552 IN-PRI CT M5 prim. rated current of CTs for measuring location M5,
• Address 553 IN-SEC CT M5 sec. nominal current CT for measuring location M5,
If the device is applied as transverse differential protection for generators or motors,
special considerations must be observed for the CT connections: In a healthy opera-
tional state all currents flow into the protected object, i.e. in contrast to the other appli-
cations. Therefore you have to set a „wrong" polarity for one of the current transformer
sets. The part windings of the machine windings correspond to the „sides".
One example is illustrated in figure 2-14. Although the starpoints of both current trans-
former sets are looking towards the protected object, the opposite setting is to be se-
lected for "side 2": STRPNT->OBJ M2 = NO.
Figure 2-14 Current transformer starpoints in transverse differential protection - example
2.1 General
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