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The AD analog-to-digital converter group contains analog/digital converters and memory chips for data transfer
to the microcomputer system.
Microcomputer System
Apart from processing the measured values, the microcomputer system µC also executes the actual protection
and control functions. They especially consist of:
• Filtering and conditioning of the measured signals
• Continuous monitoring of the measured quantities
• Monitoring of the pickup conditions for the individual protective functions
• Querying of limit values and time sequences
• Control of signals for logical functions
• Reaching trip and close command decisions
• Stocking messages, fault data and fault values for fault analysis purposes
• Administration of the operating system and its functions, e.g. data storage, realtime clock, communication,
interfaces, etc.
The information is provided via output amplifier OA.
Binary Inputs and Outputs
Binary inputs and outputs from and to the computer system are routed via the I/O modules (inputs and outputs).
The "µC" issues information to external equipment via the output contacts. Outputs are mainly commands that
are issued to the switching devices and messages for remote signalling of events and states.
Front Elements
LEDs and an LC display provide information on the function of the device and indicate events, states and mea-
sured values.
Integrated control and numeric keys in conjunction with the LCD facilitate local interaction with the local device.
All information of the device can be accessed using the integrated control and numeric keys. This information
includes protective and control settings, operating and fault indications, and measured values; setting param-
eters can be changed (see also Chapter 2 and SIPROTEC 4 System Description).
Serial Interfaces
Via the serial operator interface in the front panel the communication with a personal computer using the oper-
ating program DIGSI is possible. This facilitates a comfortable handling of all device functions.
The service interface can also be used for communication with a personal computer using DIGSI. This is es-
pecially well suited for the central interrogation of the devices from a PC or for remote operation via a modem.
All device data can be transmitted to a central evaluating unit or control center through the serial system
(SCADA) interface. This interface may be provided with various physical transmission modes and different pro-
tocols to suit the particular application.
A further interface is provided for time synchronization of the internal clock through external synchronization
sources.
Further communication protocols can be realized via additional interface modules.
Power Supply
These described functional units are supplied by a power 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
power system are usually bridged by a capacitor (see also Technical Data, Subsection 4.1).
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Introduction
1.1 Overall Operation
17
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