Siemens Reyrolle 7SR18 Numerical Relay:Line Differential Protection Relay

Our differential protection relay, Reyrolle 7SR18 Numerical Relay is a three phase differential protection relay used to detect in zone phase and earth faults. This differential protection relay is applied to overhead line and underground cable circuits as well as shorter circuits such as interconnectors. Reyrolle 7SR18 differential protection relays have integral back-up overcurrent/earth fault protection and intertripping channels.Protection Relays (and associated CTs) are installed at each end of the protected circuit. The relays are connected together with a fully supervised fibre optic protection communications link.Relays have four current inputs and are housed in E6 cases. Integrated logic is provided to allow the optimal configuration of relay protection functionality with the relay’s analogue inputs and binary input/output circuits.Protection and instrumentation functionality is accessible 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

Features

Reyrolle 7SR18 differential protection relays have integral back-up overcurrent/earth fault protection and intertripping channels.

Protection Relays (and associated CTs) are installed at each end of the protected circuit. The relays are connected together with a fully supervised fibre optic protection communications link.

Relays have four current inputs and are housed in E6 cases.

Integrated logic is provided to allow the optimal configuration of relay protection functionality with the relay’s analogue inputs and binary input/output circuits.

Protection and instrumentation functionality is accessible via the data comms channel – a front USB, RS485 and IEC 61850 (optional) rear ports.

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

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!