ABB RET670-1MRK004816 – High‑end Transformer Differential Protection and Control IED

The ABB RET670-1MRK004816 sits at the top of the Relion 670 series for transformer protection. It’s built for two- and three‑winding transformers, including autotransformers, where high‑speed differential protection, secure inrush blocking, and comprehensive control functions matter. From my experience, it’s the relay you pick when you need dependable protection with modern substation communications and plenty of application depth.

You might notice that the 670 platform is often chosen in critical substations—mainly because it combines precise protection algorithms with flexible I/O and IEC 61850 networking (including PRP/HSR redundancy). In many cases, it also replaces separate bay controllers thanks to its integrated control and disturbance recording.

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Key Features

• True transformer differential (87T) for 2- or 3‑winding units – Phase‑shift compensation, CT ratio/adaptation, and multi‑slope restraint to handle through‑faults and CT saturation.
• Advanced inrush and over‑excitation blocking – Harmonic restraint and waveform‑based logic reduce nuisance trips during energization and over‑fluxing conditions.
• Restricted earth fault (64REF) – Sensitive protection for winding/neutral faults where fast tripping is needed.
• Comprehensive backup protection – 50/51, 50N/51N, 59/27, 46/47, thermal overload (49) for dependable backup in many cases.
• Breaker failure and interlocking – 50BF with flexible logic and bay interlocking to keep the scheme safe and selective.
• Integrated control and supervision – Front HMI with programmable LEDs; typical bay control removes the need for a separate controller in many stations.
• IEC 61850 with PRP/HSR redundancy – GOOSE/MMS for fast peer‑to‑peer and SCADA; typically supports dual redundant Ethernet for high availability.
• Disturbance and event recording – COMTRADE disturbance files and 1 ms SOE help with fast, clear post‑fault analysis.
• Time synchronization – SNTP and, where fitted, IRIG‑B or IEEE 1588 PTP for precise time tagging across networks.
• Engineering with PCM600 – Streamlined configuration and testing workflow that most protection teams already use.

Technical Specifications

Where it fits best

Typical deployments include transmission and sub‑transmission transformers, high‑value autotransformers at grid interties, and industrial plants that need fast differential protection with selective backup. One thing I appreciate is how well the differential scheme handles heavy through‑faults and CT saturation—usually without giving up speed.

Field feedback from a utility client: “We standardized on RET670 for our 220 kV autotransformers. The inrush logic behaves consistently during cold energizations, and with PRP we’ve had no comms‑side single points of failure.”

Related or Supporting Products

• ABB RET650 – Similar transformer differential protection in the 650 series; a bit more compact while retaining key 87T and REF functions.
• ABB RET615 – For medium‑voltage transformers; simpler footprint and I/O count, cost‑effective for distribution substations.
• ABB REX640 – Modular next‑gen platform; flexible application packages and modern cybersecurity features.
• ABB COM600E – Station automation gateway/server to integrate multiple IEDs and provide HMI/SCADA connectivity.
• ABB SAM600 – Process‑bus merging unit (if you’re moving toward IEC 61850‑9‑2 architectures).

Installation & Maintenance

• Panel & cabinet – Install in a clean, dry, ventilated cabinet; maintain clearance for heat dissipation. Typical 19‑inch rack or flush‑mount door installation.
• Wiring practices – Use shielded twisted pair for comms; segregate CT/VT circuits from DC control wiring. Confirm CT polarities and star‑point connections before energization.
• Settings & vector group – Configure transformer vector group and tap details; verify 87T slopes, harmonic blocking, and REF polarity. From my experience, a short secondary‑injection test catches most mis‑wires early.
• Networking – If using PRP/HSR, plan physically separate Ethernet paths. Enable time sync (SNTP or PTP/IRIG‑B) for accurate disturbance records.
• Routine care – Periodically back up settings via PCM600, clean the front panel, and review SOE/disturbance logs. Apply approved firmware updates during scheduled outages.
• Safety – De‑energize CT circuits properly and short CT secondaries before maintenance; follow site LOTO procedures.

Quality & Certifications

• Standards – Designed and type‑tested to IEC 60255 series; IEC 61850 conformance for communication.
• Compliance – CE marked; RoHS compliant; UL/cUL listings are commonly available for Relion 670 units (versions may vary by region).
• Manufacturer warranty – ABB’s standard limited warranty typically covers 12 months from commissioning (or 18 months from delivery), depending on region and contract terms.

If you’re upgrading an existing transformer bay, RET670-1MRK004816 seems to be a straightforward drop‑in when you need high‑speed 87T with modern comms. Most teams appreciate the predictable testing workflow in PCM600 and the robust inrush logic—especially during cold starts or after maintenance outages.