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; 2nd harmonic restraint; up to 6 restraint CT inputs
• Condition: New Original (New Surplus), not refurbished

ABB identifies this configuration as “Transformer protection IED, Single Breaker, 2 winding” under the RET670 A30 family.

 Product Introduction

ABB RET670 1MRK004816-AB is designed for transformer protection applications where CT saturation behavior, selective fault clearing, and stable substation communication matter more than decorative HMI features. It is commonly deployed in utility substations, generator-transformer blocks, refinery power systems, and industrial HV distribution networks handling two-winding transformer schemes.

In retrofit projects, this relay is frequently selected because its low-impedance differential logic places relatively low demands on CT performance while still supporting fast fault clearing and harmonic restraint during transformer energization. The platform also supports IEC 61850 integration, event recording, and PCM600 engineering tools for modern digital substations. Exact firmware revision and hardware configuration should always be verified before commissioning or relay replacement.

 Key Selling Points & Differentiators

• ABB RET670 1MRK004816-AB supports differential protection, restricted earth fault protection, transformer monitoring, breaker failure logic, and event recording inside one IED platform.
• The low-impedance differential protection function supports multi-breaker arrangements with up to six restraint CT inputs while maintaining low CT performance requirements.
• 2nd harmonic and 5th harmonic restraint functions improve stability during transformer energization, CT saturation, and overexcitation conditions.
• IEC 61850, GOOSE messaging, Modbus, and DNP3 support simplify integration into SCADA and digital substation environments.
• 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 protection relays, this platform adds disturbance recording, SOE logging, programmable logic, and remote engineering through PCM600.
• Not recommended for uncontrolled “drop-in” replacement projects where firmware branch, CT polarity mapping, or IEC 61850 datasets are undocumented.