Overall Operation - Siemens SIPROTEC 7SD610 Manual

Introduction

1.1 Overall Operation

1.1 Overall Operation
The SIPROTEC 4 7SD610 line protection is equipped with a powerful microprocessor system. This provides
fully digital processing of all functions in the device, from the acquisition of the measured values up to the output
of commands to the circuit breakers, as well as the exchange of measured data with the other ends of the pro-
tected 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 instrument 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 ) may be used for the earth current (current transformer starpoint or a separate earth current transform-
4
er) or the starpoint current of the transformer side to be protected (earth fault differential protection).
Figure 1-1
18
Hardware structure of the differential protection 7SD610
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011