Product Core Brief
- Model: RET670 1MRK004816-AB
- Brand: ABB
- Series: Relion® 670
- Core Function: High-speed transformer differential protection
- Type: Transformer protection IED / numerical relay
- Key Specs: IEC 61850 support; 2nd harmonic restraint; multi-breaker differential logic
- Condition: New Original (New Surplus), not refurbished
Product Introduction
ABB RET670 1MRK004816-AB is a transformer protection IED intended for high-voltage substations, generator-transformer units, and industrial power systems where differential protection stability matters more than cosmetic HMI features. It is commonly deployed on two-winding transformers that require fast fault clearing, disturbance recording, and IEC 61850 communication capability.
One reason engineers still specify this platform in retrofit projects is its low CT burden requirement and built-in vector group compensation. In practice, that reduces headaches during transformer replacements and minimizes the need for interposing CT hardware. Typical deployments include transmission substations, refinery power systems, and utility step-up transformer bays. 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, breaker failure logic, event recording, and transformer monitoring in one IED platform.
- The low-impedance differential function supports multi-breaker arrangements with up to six restraint CT inputs and low CT performance requirements.
- 2nd harmonic restraint and 5th harmonic blocking improve stability during transformer energization and overexcitation conditions.
- 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 provides IEC 61850 integration, disturbance recording, SOE logging, and PCM600 engineering support.
- Not recommended for uncontrolled “drop-in” replacement projects where firmware branch, transformer vector group settings, or GOOSE datasets are undocumented.
