Introduction
1.2 Application Scope
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
27
Interlocking conditions for switching (e.g. switchgear interlocking) can be established using the integrated user-
defined logic.
Indications and measured values; fault recording
The operational indications provide information about conditions in the power system and the device. Measure-
ment quantities and values that are calculated can be displayed locally and communicated via the serial inter-
faces.
Device messages can be assigned to a number of LEDs on the front panel (programmable), can be externally
processed via output contacts (programmable), linked with user-definable logic functions and/or issued via
serial interfaces (see Communication below).
During a fault (system fault) important events and changes in conditions are saved in fault logs. Instantaneous
fault values are also saved in the device and may be analysed at a later time.
As a special feature the values are synchronized between the line terminals via the communication link.
Communication
Serial interfaces are available for the communication with operating, control and memory systems.
A 9-pin DSUB socket on the front panel is used for local communication with a personal computer. By means
of the SIPROTEC 4 operating software DIGSI, all operational and evaluation tasks can be executed via this
operator interface, such as specifying and modifying configuration parameters and settings, configuring user-
specific logic functions, retrieving operational and fault messages and measured values, reading out and dis-
playing fault recordings, inquiring device conditions and measured values, issuing control commands.
To establish an extensive communication with other digital operating, control and memory components the
device may be provided with further interfaces depending on the order variant.
The service interface can be operated via the RS232 or RS485 interface and also allows communication via
modem. For this reason, remote operation is possible via PC and the DIGSI operating software, e.g. to operate
several devices via a central PC.
The system interface is used for central communication between the device and a control center. It can be op-
erated through the RS232, the RS485 or the FO port. Several standardized protocols are available for data
transmission. An EN 100 module allows integrating the devices into 100 MBit Ethernet communication net-
works of the process control and automation system, using IEC 61850 protocols. In parallel to the link with the
process control and automation system, this interface can also handle DIGSI communication and inter-relay
communication using GOOSE messaging.
Another interface is provided for the time synchronization of the internal clock via external 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 or service interface allows to operate the device remotely or locally using a standard browser. This
is possible during commissioning, checking and also during operation with the devices at all ends of the pro-
tected object via a communication network. For this purpose, a „WEB Monitor“ is provided, which has been
optimised specially for the differential protection system, but which has also been upgraded to meet the dis-
tance protection requirements.
