Siemens Reyrolle 7SR23 High Impedance Protection Relay

Reliserv Solution provides the 7SR23 DAD, a numeric high impedance circulating current relay with four current inputs that detects phase and earth faults as a unit protection. You can apply the relay to busbars, connections, transformers, reactors, and motors. Technicians use the relay in high impedance applications alongside external stabilizing resistors and non-linear resistors (Metrosils). We provide standardized external components in an Epsilon case to simplify design and installation. The integral CT supervision feature detects open circuits in the CT secondary wiring, which is essential when switching CT circuits.

Relays are housed in E6 or E8 cases. Integrated logic is provided to allow the optimal configuration of relay input and output functionality. Protection, instrumentation and metering functionality is accessible via data comms channels. A front fascia USB port for local connection and RS485 rear port for remote connection are provided as standard, additional rear ports are available as options.

Protection relays are essential for network operators, electricity suppliers, and industrial enterprises in every sector.The Reyrolle 7SR23 DAD device has been specifically designed to provide comprehensive, configurable high impedance protection with enhanced functionality and performance.

PROTECTION FUNCTIONS

• Overall differential protection 87/50(G)
• Restricted earth fault protection 87REF
• Earth fault (50G)

SUPERVISION FUNCTIONS

• CT Supervision (CT50)
• Fault Clearance Monitor (87/50BF)

MONITORING FUNCTIONS

• Instrumentation

FURTHER FUNCTIONS

• IEC 61850 option
• Eight settings groups
• Password protection
• Self monitoring
• Fault, event and waveform records

Therefore, the comprehensive range of Reyrolle products provides the total protection requirements of distribution markets and industrial applications – ranging from overcurrent protection via transformer protection and voltage control to a full spectrum of auxiliary and trip relays. The portfolio includes many famous products such as “Argus, “Duobias”, “Solkor”, “Rho, etc. Through successive generations, Reyrolle numerical products have been developed to increase value to system operators. Discover the portfolio!