•
Control of logic function signals
•
Issue of trip and close commands
•
Storage of events, indications, fault data and fault values
•
Data communication
•
Real time clock and time synchronization.
Power Supply
The 7SR5 is powered by an internal power supply. Brief interruptions in the supply voltage, which can occur
during open circuits in the system auxiliary voltage supply are generally bridged by capacitor storage.
Analog Inputs
7SR5 devices have current transformer and, depending on the device type, voltage transformer inputs.
The 7SR5 analogue inputs transform the currents and voltages from the instrument transformers to the
internal processing level of the device.
Current inputs are provided in groups of four CTs, these can be used to measure phase and earth currents.
Where the application requires high current sensitivity a core balance current transformer can be used with
the earth current input.
Voltage inputs are provided in groups of four VTs. The first 3 inputs (e.g. VT1/2/3) are grouped and are suitable
for connection to all primary plant voltage transformer configurations, the fourth voltage input (e.g. VT4) is
independent and can be connected as required by the application.
Binary Inputs and Outputs
7SR5 devices include a number of binary input functions, categorized as:
•
Voltage operated binary inputs
•
Virtual inputs/outputs (see also binary outputs in following list)
•
Function key binary inputs
•
General alarms
Binary output functions are categorized as :
•
Binary output relays
•
Virtual inputs/outputs (see also binary inputs in previous list)
•
Fascia LEDs
•
General pickup outputs
•
Trip config outputs
Binary input and binary output functionality is fully programmable. These can be used for a number purposes.
Voltage operated binary inputs allow the device to receive external information from the system or from other
devices.
The binary output relays are used to initiate primary plant switching and provide indications for remote
signaling of important events and states.
Serial Interfaces
The USB interface on the relay fascia enables local communication with a personal computer when using the
Reydisp operating program.
The IP address for all 7SR5 device front ports is 192.168.2.1.
The USB drivers must be installed prior to connection.
A RS485 port on the rear of the device provides remote communications using user selectable protocols.
Introduction
22 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
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