1 Introduction
20
7SA522 Manual
C53000-G1176-C155-3
Microcomputer
System
Apart from processing the measured values, the microcomputer system µC also exe-
cutes 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 computer system obtains the information from the
system (e.g remote resetting) or the external equipment (e.g. blocking commands).
Additional 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 measured values.
Integrated control and numeric keys in conjunction with the LCD facilitate local inter-
action with the device. Thereby, all information on the device such as configuration
and setting parameters, operation and fault indications and measured values can be
retrieved or changed, (see also Chapter 2 and SIPROTEC
®
4 System Description,
order no. E50417-H1176-C151.
Devices with control functions also allow station control on the front panel.
Serial Interfaces Via the serial interface
in the front panel the communication with a personal computer
using the operating program DIGSI
®
is possible. This facilitates a comfortable han-
dling of all device functions.
The service
interface can also be used for communication with a personal computer
using DIGSI
®
. This interface is especially well suited for the fixed wiring of the devices
to the PC or operation via a modem.
Via the serial system interface
all device data can be transferred to a central evalua-
tion unit or to a control centre. This interface may be provided with various protocols
and physical transmission schemes to suit the particular application.
A further interface is provided for time synchronization
of the internal clock through ex-
ternal synchronization sources.
Further communication protocols can be realized via additional interface modules.
Protection Data In-
terface (optional)
Depending on the version there are one or two protection data interfaces
. Via these
interfaces the data for the teleprotection scheme and further information such as
closing the local circuit breaker, other external trip commands coupled via binary
inputs and binary information can be transmitted to other ends.
Power Supply These described functional units are supplied by a power supply PS with the neces-
sary power in the different voltage levels. Brief supply voltage dips which may occur
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