Front Fascia
The fascia Light Emitting Diodes (LEDs) and Liquid Crystal Display (LCD) provide information on the device
function and report events, states, and measured values.
The fascia keypad enables on-site operation of the device without the need for the Reydisp software tool.
Device information such as setting parameters, operating and fault indications or measured values can be
displayed, and setting parameters changed.
System equipment can be controlled from the front fascia when the 7SR5 is suitably configured.
Microcomputer System
All device functions are processed in the device CPU, these include, for example:
•
Filtering and processing of the measurands
•
Continuous monitoring of the measurands
•
Monitoring of the pickup conditions for the individual protection functions
•
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
Introduction
24 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
To Next Page
Loading...
