Functions
2.17 Additional Functions
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
253
2.17.5 Differential Protection Values
2.17.5.1 Measured values of differential protection
The differential and restraint current values of the differential protection which are listed in the following table
can be called up at the front of the device, read out via the operating interface using a PC with DIGSI or trans-
ferred to a control centre via the system interface.
Table 2-12 Measured values of the differential protection
1)
for lines according to address (see section 2.1.4), for transformers calculated from address (see Section 2.1.4)
I
N
=S
N
/(√3 ·U
N
)
2.17.5.2 Information List
Measured Values % Referred to
IDiff
L1
, IDiff
L2
, IDiff
L3
Calculated differential currents of the three phases Nominal operational current
1)
IRest
L1
, IRest
L2
, IRest
L3
Calculated restraining currents of the three phases Nominal operational current
1)
IDiff
3I0
Calculated differential current of the zero sequence system Nominal operational current
1)
No. Information Type of In-
formation
Comments
7742 IDiffL1= MV IDiffL1(% Operational nominal current)
7743 IDiffL2= MV IDiffL2(% Operational nominal current)
7744 IDiffL3= MV IDiffL3(% Operational nominal current)
7745 IRestL1= MV IRestL1(% Operational nominal current)
7746 IRestL2= MV IRestL2(% Operational nominal current)
7747 IRestL3= MV IRestL3(% Operational nominal current)
7748 Diff3I0= MV Diff3I0 (Differential current 3I0)
30654 IdiffREF= MV Idiff REF(% Operational nominal current)
30655 IrestREF= MV Irest REF(% Operational nominal current)
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