Product Core Brief

• Model: RET670 1MRK004816-AB
• Brand: ABB
• Series: Relion® 670
• Core Function: Fast transformer differential protection
• Type: Numerical transformer protection relay / IED
• Key Specs: IEC 61850 support; harmonic restraint; low-impedance differential logic
• Condition: New Original (New Surplus), not refurbished

ABB classifies this version as a “Transformer protection IED, Single Breaker, 2 winding” configuration within the RET670 A30 family.

Product Introduction

ABB RET670 1MRK004816-AB is designed for transformer protection applications where fast fault clearing, stable differential performance, and dependable IEC 61850 communication matter more than oversized HMI displays. It is widely deployed in transmission substations, generator-transformer blocks, refinery power systems, and industrial HV distribution networks handling two-winding transformer schemes.

This relay is frequently selected for retrofit projects because its low-impedance differential algorithm maintains relatively low CT burden requirements while still supporting stable operation during transformer energization and external faults. Built-in vector group compensation, programmable logic, disturbance recording, and GOOSE communication reduce external hardware requirements and simplify digital substation migration. Exact firmware branch, hardware configuration, and I/O mapping should always be verified before commissioning or replacement.

Key Selling Points & Differentiators

• ABB RET670 1MRK004816-AB combines 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 function supports multi-breaker applications with up to six restraint CT inputs while maintaining relatively low CT performance requirements.
• 2nd harmonic restraint and 5th harmonic blocking reduce nuisance trips during transformer energization and overexcitation conditions.
• IEC 61850, GOOSE messaging, Modbus, and DNP3 support simplify integration into SCADA and digital substation systems.
• 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, this platform adds COMTRADE disturbance recording, SOE logs, configurable 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.