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Introduction
1.1 Overall Operation
Serial Interfaces
A personal computer running the DIGSI software can be connected to the serial operator interface (PC port)
on the front panel. This permits convenient operation of all functions of the device.
The serial service interface can also be used for communication with a PC using DIGSI. This is especially
suited for dedicated connection of the devices to the PC or for operation via a modem.
All device data can be transferred to a central master or main control system through the serial system
(SCADA) interface. This interface may be provided with various protocols and physical transmission modes to
suit the particular application.
A further port is provided for the time synchronisation of the internal clock via external synchronisation sources.
The operator or service interface allows the communication with the devices at all ends of the protected object
during commissioning, checking and also during operation using a standard browser via a communication
network This function is supported by a comprehensive „WEB Monitor" which has been optimised especially
for the line protection system.
Protection data interfaces
The protection data interfaces are a particular case. Depending on the model, there are one or two protection
data interfaces available. Via these interfaces the measured value data of each end of the protected object is
transmitted to other ends; during this procedure measured values already received from another end may also
be added. Further information such as closing the local circuit breaker, pickup of the inrush restraint as well as
other external trip commands coupled via binary inputs or binary information can be transmitted to other ends
via the protection data interfaces.
Power Supply
These described functional units are supplied by a current supply PS with the necessary power in the different
voltage levels. Brief supply voltage dips which may occur on short circuits in the auxiliary voltage supply of the
devices are usually bridged by a capacitor (see also Technical Data, Chapter 4.1).
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SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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