Siemens SIPROTEC 7UT613 series Manual page 60

2 Functions
Assignment of Aux-
iliary 1-phase Mea-
suring Locations
60
In the example in figure 2-6 is for a PROT. OBJECT = Autotransf. the side S3 the
tertiary winding, thus the accessible and load capable compensation winding. In this
example the setting would be:
Address 243 SIDE 3 = compensation.
This option is only possible for PROT. OBJECT = Autotransf..
In the examples of figure 2-7 for PROT. OBJECT = Autotr. node side 3 is facing
the earthing electrode of the transformer. Here:
Address 243 SIDE 3 = earth.electrode.
This option is only possible if PROT. OBJECT = Autotransf. or if PROT. OBJECT
= Autotr. node, if no further side has been assigned.
The same applied to address 244 SIDE 4 = earth.electrode
In summary we can say: the sides S1 and S2 are imperatively assigned to the connec-
tions of the auto-connected winding. For SIDE 3 and SIDE 4 you have to select the
option corresponding to the topology: auto-connected (for another tap of the auto-
connected winding), compensation (for an accessible and load-capable compensa-
tion winding) or earth.electrode (for the earthed side of the auto-connected wind-
ings).
Each of the auxiliary (1-phase) current inputs must now be assigned in the addresses
251 to 254. The number of auxiliary inputs depends on the device type (cf. Table 2-
1). In 7UT635 all inputs IX1 to IX3 are only available as additional 1-phase measuring
inputs if they are not needed for a fifth 3-phase measuring location, i.e. if only four 3-
phase measuring locations are needed.
The auxiliary inputs can be assigned to a side or a measuring location, or they can
remain non-assigned. If you have assigned exactly one measuring location to a side,
this side is equivalent to the measuring location.
Single-phase auxiliary measured currents are used in the following cases:
1. In differential protection, to include the starpoint current of an earthed transformer
winding (either directly or via a neutral earthing reactor in the protected zone);
2. In restricted earth fault protection, to compare the starpoint current of an earthed
winding (transformer, generator, motor, shunt reactor, neutral earthing reactor)
with the zero sequence current from the phase currents;
3. In earth fault overcurrent protection, to detect the earth fault current of an earthed
winding or neutral earthing reactor;
4. In single-phase overcurrent protection, to detect any 1-phase current ;
5. For operational limit monitoring tasks and/or display of measured values.
7UT613/63x Manual
C53000-G1176-C160-2