Voltage and frequency protection
The Reyrolle 7SR158 Argus voltage and frequency relays are numerical, multifunctional devices, with functionality designed for connection to voltage transformers.
The voltage and frequency functionality is supplemented by data storage, instrumentation, user configurable logic and data communication features. A menu based user-friendly interface provides local access to relay settings, instruments and operational data. The fascia also benefits from 9 user configurable, tri-coloured LEDs and a USB port for PC access.
The key functions provided include 27/59 -under and overvoltage, 81 -under and over frequency, 78 -Voltage vector shift and 81R -Rate of change of frequency.
Relays have three voltage inputs, six binary inputs and eight binary outputs and are housed in a size E4 case. Programmable logic is provided to allow the optimal configuration of relay functionality. A rear electrical RS485 port is provided for SCADA connection using either IEC60870-5-103, DNP3.0 or MODBUS RTU protocol.
Rate of change of frequency
Negative phase sequence voltage
Neutral voltage displacement
Voltage vector shift
Trip and close circuit supervision
Primary/secondary line and phase voltages
Historical demand record
Positive phase sequence (PPS) voltage
Negative phase sequence (NPS) voltage
Zero phase sequence (ZPS) voltage
Four settings groups
2 levels password protection
Circuit breaker trip and maintenance counters
Fault, event and waveform records
Programmable user logic
Front USB communication port
Rear RS485 communication port