RET650*1.1-A05X00-X00-B1A2-BE-SA-AB1-SA1B1-AA-BT1452016 ABB

Product Core Brief

Model: RET650*1.1-A05X00-X00-B1A2-BE-SA-AB1-SA1B1-AA-BT1452016
Brand: ABB
Series: Relion® 650
Core Function: Differential protection for 3-winding transformers
Type: Numerical transformer protection relay / IED
Key Specs: IEC 61850 support; 24–250 V universal supply; harmonic restraint logic
Condition: New Original (New Surplus), not refurbished

RET650 A05 is defined by ABB as a transformer protection configuration for single-breaker, three-winding applications.

Product Introduction

ABB RET650 1MRK008516-BB is a configured transformer protection IED intended for three-winding transformer applications where differential protection speed, harmonic restraint behavior, and stable IEC 61850 communication matter more than cosmetic HMI features. It is widely used in utility substations, generator-transformer blocks, and industrial power distribution systems.

This specific A05 configuration is commonly selected for single-breaker transformer schemes that require internal CT ratio matching and vector group compensation without adding interposing CTs. Typical deployments include 11 kV to 132 kV substations and retrofit projects replacing older electromechanical or early numerical relays. Fast differential protection below typical sub-cycle operating times is possible depending on CT quality, firmware revision, and application settings. Verify the exact hardware and firmware package before installation.

Key Selling Points & Differentiators

ABB RET650 1MRK008516-BB combines transformer differential, restricted earth fault, thermal overload, breaker failure, and backup overcurrent protection inside one IED platform.
Internal CT ratio matching and vector group compensation reduce retrofit complexity and remove the need for interposing CTs in many applications.
2nd harmonic blocking and 5th harmonic restraint improve security during transformer energization and overexcitation events.
Incoming stock should pass serial verification, startup diagnostics, communication handshake checks, 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 provides disturbance recording, IEC 61850 integration, SOE logging, and PCM600 engineering support.
Not recommended for blind “drop-in” replacement when firmware branch, GOOSE datasets, or transformer vector group settings are undocumented.