Introduction
1.1 Overall Operation
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
22
Microcomputer System
Apart from processing the measured values, the microcomputer system (
µ
C) also executes the actual protec-
tion and control functions. They especially include:
• Filtering and preparation of the measured quantities
• Continuous monitoring of the measured quantities
• Monitoring of the pickup conditions for the individual protective functions
• Interrogation of limit values and sequences in time
• Control of signals for the logic functions
• Output of control commands for switching devices
• Recording of messages, fault data and fault values for analysis
• Management of the operating system and the associated functions such as data recording, real-time clock,
communication, interfaces, etc.
• The information is distributed via output amplifiers (OA).
Binary Inputs and Outputs
Binary inputs and outputs to and from the computer system are relayed via the input/output modules. The com-
puter system obtains the information from the system (e.g. remote resetting) or the external equipment (e.g.
blocking commands). Outputs are, in particular, commands to the switchgear units and annunciations for
remote signalling of important events and statuses.
Front Panel
In devices with integrated or detached operator panel, information such as messages related to events, states,
measured values and the functional status of the device are visualized by light-emitting diodes (LEDs) and a
display screen (LCD) on the front panel.
Integrated control and numeric keys in conjunction with the LCD enable interaction with the remote device. Via
these elements all information of the device such as configuration and setting parameters, operating and fault
messages, and measured values can be accessed. Setting parameters may be changed in the same way.
In addition, control of circuit breakers and other equipment is possible from the front panel of the device.
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