Description

The ABB 1MRS050775 feeder protection relay is a versatile component of ABB’s Relion® 600 series, engineered for precision protection in medium-voltage distribution networks. Designed for utility and industrial power systems, the ABB 1MRS050775 integrates comprehensive protection functions including directional/non-directional overcurrent, earth fault detection, and transformer inrush stabilization. Its IEC 61850 Ed.2 compliant communication enables seamless integration with modern digital substations, while the adaptable logic editor allows custom protection schemes without additional hardware. The relay features high-speed operation (<20>

ABB 1MRS050775

Technical Specifications

Main Features and Advantages

Superior protection intelligence defines the ABB 1MRS050775: Its adaptive overcurrent curves automatically compensate for network topology changes, while the directional earth fault feature (67N) discriminates fault locations within 15 ms. The integrated arc-flash detection reduces incident energy by 90% through optical sensor compatibility. Cybersecurity is hardened with IEC 62443-4-2 compliance, featuring role-based access and audit trails.
Operational efficiency shines through its Condition Monitoring function, predicting insulation degradation via leakage current measurements. The relay’s 128-event fault recorder captures 10-cycle pre-trigger waveforms for forensic analysis. Front-panel USB ports enable instant configuration without tools, and the ABB 1MRS050775 supports hot-swapping during live operations. Compatibility with ABB’s PCM600 software simplifies parameterization across fleets, while its <0>

Application Field

The ABB 1MRS050775 excels in diverse power management scenarios: In utility distribution networks, it protects underground cables and overhead lines against phase-to-phase and earth faults, enabling automated fault location and isolation. Industrial plants deploy it for motor feeder protection in steel mills and paper manufacturing, where its thermal overload modeling prevents winding damage.
Renewable energy applications leverage the ABB 1MRS050775 for solar farm combiner boxes and wind turbine step-up transformers, utilizing its voltage-dependent overcurrent function for anti-islanding. Oil/gas platforms rely on its Ex-certified variants for hazardous zone switchgear protection. Rail electrification systems employ the relay for traction substation feeders, exploiting its DC component suppression algorithm to avoid nuisance tripping during train acceleration.

Related Products

ABB REF620: Advanced feeder protection with distance protection

ABB RET615: Transformer protection relay with differential function

ABB REC615: Bay controller for substation automation

ABB REM615: Motor protection relay with rotor stall detection

ABB PCM600: Unified configuration tool for Relion® series

ABB REX640: Multi-functional protection for complex grids

ABB SPAJ 110 C: Economical backup protection relay

ABB 1MRS050775

Installation and Maintenance

Pre-installation preparation: Verify panel cutout dimensions (164×164 mm) and clearances (>50 mm top/bottom). Ensure CT secondary circuits are grounded at one point only. Configure communication addresses before energizing the ABB 1MRS050775.
Maintenance recommendations: Perform annual primary injection testing to validate protection curves. Monitor battery health via PCM600; replace every 5 years. Clean optical sensor lenses quarterly in dusty environments. For firmware upgrades, use ABB’s Secure Maintenance Tool to preserve cybersecurity certificates. Log event reports monthly to track insulation resistance trends in the ABB 1MRS050775.