Siemens siprotec 7SD5 User Manual

2.24 Ancillary Functions
427
7SD5 Manual
C53000-G1176-C169-1
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
®
or transferred to a central master
station via the system interface.
Table 2-21 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
)
2.24.5.2 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 restraint currents of the three phases Nominal operational current
1)
IDiff
3I0
Calculated differential current of the zero sequence system Nominal operational current
1)
Ic
L1,
Ic
L2
, Ic
L3
Measured charging currents of the three phases Nominal operational current
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)
7880 Ic L1 = MV Measured value charging current L1
7881 Ic L2 = MV Measured value charging current L2
7882 Ic L3 = MV Measured value charging current L3
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English