Table of Contents
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1 Introduction
1.1
Overall Operation
The SIPROTEC 4 7SD610 line protection is equipped with a powerful microprocessor
system. This provides fully numerical processing of all functions in the device, from the
acquisition of the measured values up to the output of commands to the circuit break-
ers, as well as the exchange of measured data with the other ends of the protected
area. Figure 1-1 shows the basic structure of the device.
Analog Inputs
The measuring inputs (MI) convert the currents and voltages coming from the instru-
ment transformers and adapt them to the level appropriate for the internal processing
of the device. The device has 4 current and 4 voltage inputs. Three current inputs are
provided for measurement of the phase currents, a further measuring input (I
be used for the residual current (current transformer starpoint or a separate earth
current transformer) or the starpoint current of the transformer side to be protected by
the restricted earth fault protection.
Figure 1-1
16
Hardware structure of the differential protection 7SD610
) may
4
7SD610 Manual
C53000-G1176-C145-4
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