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1 Introduction
computer and the DIGSI
central PC.
The system interface is used for central communication between the device and a
control centre. The service interface can be operated through data cables or optical
fibres. For data transmission there are several standardized protocols available.
Another interface is provided for the time synchronization of the internal clock via ex-
ternal synchronization sources (IRIG-B or DCF77).
Other interfaces provide for communication between the devices at the ends of the
protected object. These protection data interfaces have been mentioned above in the
protection functions.
The operator and service interface allow to operate the device remotely or locally,
using a standard browser. This is possible during commissioning, checking and also
during operation of the devices at all ends of the protected object, using a communi-
cation network. For this special commissioning tool, the "WEB-Monitor", is provided,
which has been optimized for the differential protection system, but upgraded for the
needs of the distance protection.
26
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operating software, e.g. to operate several devices via a
7SD5 Manual
C53000-G1176-C169-1
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