14/1/98 Page 5 Issue H
4.1.1 Analogue input circuits
The constantly monitored measuring values are galvanically decoupled, filtered and finally fed to the
analogue/digital converter. The protection unit receives these analogue input signals of the phase
currents I1, I2, I3 and Earth fault Ie, via separate input transformers.
4.1.2 Output relays
The MPR 3E5 has three output relays, with single or dual pole change-over contacts as detailed in
the previous diagram and summarised below:
• Tripping relay (2)
• Alarm relay (1)
• Programmable Relay (1)
4.1.3Remote data communication
The MPR 3E5 is provided with an RS485 interface for remote data communication with a control
centre. This facility provides the following information:
• Status signals
• Self supervision alarm signal
• Actual measured values
• Relay settings
• Fault signalling
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General