Differential Protection Values; Measured Values Of The Differential Protection; Information List - Siemens siprotec 7SD5 User Manual

2.24.5 Differential Protection Values

2.24.5.1 Measured Values of the Differential Protection

The differential, restraint and charging 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 operator interface using a PC with DIGSI
station via the system interface.
Table 2-21 Measured values of the differential protection
IDiff , IDiff , IDiff
L1 L2 L3
IRest , IRest , IRest
L1 L2 L3
IDiff
3I0
, Ic
Ic Ic
L1, L2 L3
1)
for lines according to address (see Section 2.1.4), for transformers calculated from address (see Section 2.1.4)
= S /(√3 · U )
I
N N N

2.24.5.2 Information List

No. Information
7742 IDiffL1=
7743 IDiffL2=
7744 IDiffL3=
7745 IRestL1=
7746 IRestL2=
7747 IRestL3=
7748 Diff3I0=
7880 Ic L1 =
7881 Ic L2 =
7882 Ic L3 =
7SD5 Manual
C53000-G1176-C169-1
Measured Values
Calculated differential currents of the three phases
Calculated restraint currents of the three phases
Calculated differential current of the zero sequence system
Measured charging currents of the three phases
Type of In-
formation
MV
MV
MV
MV
MV
MV
MV
MV
MV
MV
®
or transferred to a central master
Comments
IDiffL1(% Operational nominal current)
IDiffL2(% Operational nominal current)
IDiffL3(% Operational nominal current)
IRestL1(% Operational nominal current)
IRestL2(% Operational nominal current)
IRestL3(% Operational nominal current)
Diff3I0 (Differential current 3I0)
Measured value charging current L1
Measured value charging current L2
Measured value charging current L3
2.24 Ancillary Functions
% Referred to
Nominal operational current
1)
Nominal operational current
1)
Nominal operational current
1)
Nominal operational current
427