Product Core Brief

• Model: RET670 1MRK004816CF
• Brand: ABB
• Series: Relion® 670
• Core Function: Transformer differential protection and control
• Type: Numerical transformer protection relay / IED
• Key Specs: IEC 61850 communication; harmonic restraint; disturbance recording
• Condition: New Original (New Surplus), not refurbished

RET670 is designed for transformer, autotransformer, generator-transformer unit, phase-shifting transformer, and shunt reactor protection applications.

Product Introduction

ABB RET670 1MRK004816CF is a transformer protection IED developed for high-voltage substations and industrial power systems where stable differential protection, selective fault isolation, and dependable communication matter more than oversized display interfaces. It is widely applied in transmission substations, refinery power systems, generator-transformer blocks, and industrial HV distribution systems.

The RET670 platform is known for its low-impedance differential protection algorithm with relatively low CT performance requirements. Harmonic restraint logic improves stability during transformer energization and CT saturation conditions, while IEC 61850 communication and disturbance recording simplify integration into modern digital substations. Exact firmware revision, hardware configuration, and communication datasets should always be verified before commissioning or retrofit replacement.

Key Selling Points & Differentiators

• ABB RET670 1MRK004816CF integrates transformer differential protection, restricted earth fault protection, breaker failure logic, thermal overload monitoring, and programmable control functions in one IED platform.
• The low-impedance differential protection function supports multi-breaker arrangements with up to six restraint CT inputs while maintaining low CT burden requirements.
• 2nd harmonic and 5th harmonic restraint reduce nuisance trips caused by transformer inrush current, CT saturation, and overexcitation conditions.
• IEC 61850, GOOSE messaging, Modbus, and DNP3 communication support simplify integration into SCADA and digital substation architectures.
• Incoming stock should pass serial verification, startup diagnostics, communication handshake testing, binary I/O simulation, and minimum 24-hour powered runtime before shipment. Test reports with startup photos or video evidence should be available.
• Compared with older transformer relays, the RET670 platform adds COMTRADE disturbance recording, SOE logging, programmable logic, and PCM600 engineering support.
• Not recommended for uncontrolled “drop-in” replacement projects where firmware branch, CT polarity mapping, or IEC 61850 datasets are undocumented.