Siemens SIPROTEC 5 Manual page 22

Introduction
1.2 Properties of SIPROTEC 5
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Multi-layered security mechanisms in all links of the security chain
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Self-monitoring routines for reliable localization and indication of device faults
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Automatic logging of access attempts and safety-critical operations on the devices and systems
Analog Inputs
The measuring inputs transform the currents and voltages coming from the instrument transformers and
adapt them to the internal processing level of the device. A SIPROTEC 5 device has current and/or voltage
transmitters. The current inputs are therefore intended for the detection of phase currents and ground
current. The ground current can be detected sensitively using a core balance current transformer. In addition,
phase currents can be detected very sensitively for a particularly precise measurement.
The voltage inputs detect the measuring voltage of device functions requiring current and voltage measured
values.
The analog values are digitized in the internal microcomputer for data processing.
Binary Inputs and Outputs
The device receives information from the system or from other devices via the binary inputs and outputs. Indi-
cations are generated for the remote signaling of important events and states.
Front Elements
For devices with an integrated or detached operation panel, LEDs and an LC display on the front provide infor-
mation on the device function and report events, states, and measured values. In conjunction with the LC
display, the integrated keypad enables on-site operation of the device. All device information such as setting
parameters, operating and fault indications or measured values can be displayed, and setting parameters
changed.
USB Interface and Serial Interfaces
The USB interface in the front cover enables communication with a personal computer when using the DIGSI 5
operating program. As a result, the operation of all device functions is possible. Additional interfaces on the
back are used to realize various communication protocols.
Redundant Communication
SIPROTEC 5 devices maintain complete communication redundancy:
•
Multiple redundant communication interfaces
•
Redundant and independent protocols for control centers possible (such as IEC 61850, either single or
redundant)
•
Redundant time synchronization (such as IRIG-B and SNTP)
Power Supply
The individual functional units of the device are powered by an internal power supply. Brief interruptions in
the supply voltage, which can occur during short circuits in the system auxiliary voltage supply, are bridged by
capacitor storage (see also the Technical Data).
22 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017