Differential And Restraining Measured Values; Functional Description; Information List - Siemens SIPROTEC 4 7UT6 Series Manual

No. Information
1079 Θ RTD12 =

Differential and Restraining Measured Values

2.22.4
Depending on its configuration, the device calculates the measured values that are specific to differential
protection.
2.22.4.1

Functional Description

The differential and restraining values of the differential protection and the restricted earth fault protection
are listed in table
results from the parameterised nominal data of the main protected object (Section
Groups). For multi-winding transformers with different winding ratings, the most powerful winding is deci-
sive, for busbars and lines the nominal operation current as set for the protected object. In case of 1-phase
busbar protection, only the values of the connected and declared phase are displayed.
In case of restricted earth fault protection, the nominal phase currents provide the reference value.
Table 2-16 Measured values of differential protection
ΙDiffL1, ΙDiffL2, ΙDiffL3
ΙRestL1, ΙRestL2, ΙRestL3
ΙDiffEDS
ΙRestEDS
2.22.4.2

Information List

No. Information
199.2640 IdiffREF=
199.2641 IrestREF=
205.2640 IdiffRE2=
205.2641 IrestRE2=
7742 IDiffL1=
7743 IDiffL2=
7744 IDiffL3=
7745 IRestL1=
7746 IRestL2=
7747 IRestL3=
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Type of
Informa-
tion
MV
Table 2-16. They always refer to the nominal current of the main protected object, which
Measured Values
Calculated differential currents of the three phases
Calculated restraining currents of the three phases
Calculated differential current of the restricted earth
fault protection
Calculated restraint current of the restricted earth
fault protection
Type of
Informa-
tion
MV
MV
MV
MV
MV
MV
MV
MV
MV
MV
Comments
Temperature of RTD12
Comments
Idiff REF (I/Inominal object [%])
Irest REF (I/Inominal object [%])
Idiff REF2 (I/Inominal object [%])
Irest REF2 (I/Inominal object [%])
IDiffL1(I/Inominal object [%])
IDiffL2(I/Inominal object [%])
IDiffL3(I/Inominal object [%])
IRestL1(I/Inominal object [%])
IRestL2(I/Inominal object [%])
IRestL3(I/Inominal object [%])
Functions
2.22 Auxiliary Functions
2.1.5.1 Purpose of Setting
% referred to
Operational rated current of the
protected object
Operational rated current of the
protected object
Rated operational current of the
side or 3-phase measuring loca-
tion
Rated operational current of the
side or 3-phase measuring loca-
tion
287