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Siemens Reyrolle 7SR18 Line Differential Protection Relay

Siemens Reyrolle 7SR18 Line Differential Protection Relay
Siemens Reyrolle 7SR18 Line Differential Protection Relay
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Product Code : 7SR18
Brand Name : Siemens
Product Description

SiemensReyrolle 7SR18 Line Differential Protection Relay

Ourdifferential protection relay, Reyrolle7SR18, is a numeric three phasedifferential protection relay used to detect in zone phase and earth faults.This differential protection relay is applied to overhead line and undergroundcable circuits as well as shorter circuits such as interconnectors. Reyrolle7SR18 differential protection relays have integral back-up overcurrent/earthfault protection and intertripping channels. Protection Relays (and associatedCTs) are installed at each end of the protected circuit. The relays areconnected together with a fully supervised fibre optic protectioncommunications link. Relays have four current inputs and are housed in E6cases. Integrated logic is provided to allow the optimal configuration of relayprotection functionality with the relay's analogue inputs and binaryinput/output circuits.Protection and instrumentation functionality isaccessible via the data comms channel - a front USB, RS485 and IEC 61850(optional) rear ports.

Protection Functions

  • 3-phase, phase segregated current differential protection
  • Overcurrent
  • Earth Fault

Supervision Functions

  • Protection comms link supervision
  • Circuit Breaker Fail
  • CT Supervision
  • Trip Circuit Supervision

Control Functions

  • Intertripping

Monitoring Functions

  • Primary/Secondary Current Phases and Earth
  • Historical Demand Record


  • CT ratio correction
  • Four Setting Groups
  • Password Protection
  • Self Monitoring
  • Circuit Breaker Trip Counter
  • Fault, event and waveform records



Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Mr Piyush Lalchand Rathi (Partner)
Mobile :+919819614841, +919769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :+919833686249