Table of Contents
Introduction
1.1 Overall Operation
Front Elements
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 communication with the remote device.
These elements enable the user to retrieve all device information such as configuration and setting parameters,
operational indications and fault indications or measured values and to edit setting parameters.
In addition, control of circuit breakers and other equipment is possible from the front panel of the device.
Interfaces
Communication with a PC can be implemented via the USB DIGSI interface using the DIGSI software allowing
the user to conveniently handle all device functions.
Port A can be used as protection interface to communicate with another 7SD80 device via an optical fiber
cable.
If you are using a copper link to create a connection to the other 7SD80 device, use the voltage terminals D1
and D2 as protection interface.
The protection data interfaces are used to transfer the data of the measured quantities from each end of the
protected zone to the opposite end. Further information such as closing of the local circuit breaker or other ex-
ternally injected trip commands can be transmitted to the opposite end via the protection interface.
In addition to the device communication via DIGSI, port B can also be used to transmit all device data to a
central evaluator or a control center. This interface may be provided with various protocols and physical trans-
mission schemes to suit the particular application.
Power Supply
The functional units described are supplied by a power supply (PS) with the adequate power in the different
voltage levels. Transient voltage dips may occur if the auxiliary voltage supply system becomes short-circuited.
Usually, they are bridged by a capacitor storage (see also the Section 4, Technical Data).
A buffer battery is located behind the lower front cover.
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SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
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