Description
ABB RET670 1MRK004816-AC | Transformer Protection IED | A30 2-Winding Configuration
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Product family | Relion 670 |
| Device | RET670 |
| Short ordering code | 1MRK004816-AC |
| Product version | 1.2 |
| Configuration | A30 |
| Transformer arrangement | 2 winding |
| Breaker arrangement | 1 circuit breaker |
| Primary function | Transformer protection |
| Differential protection | Transformer differential protection |
| Protection functions | Current, voltage, frequency, differential and backup functions depending on configuration |
| Communication | IEC 61850 and other station-communication options depending on hardware/software configuration |
| Configuration | Application-specific |
The RET670 product guide documents transformer differential protection, current and voltage protection, frequency protection, control, monitoring, metering, disturbance recording and station/remote communication functions.
Do not use a generic 24–250 VDC / 100–240 VAC specification for this short code without checking the complete ordering string. RET670 hardware and auxiliary-power options vary by configuration. The complete ABB ordering code is more useful for determining the actual I/O, power supply, communication interfaces, and case configuration.
Product Introduction
The ABB RET670 1MRK004816-AC is a Relion 670-series transformer protection IED configured as A30 for a two-winding transformer with one circuit breaker. Its primary protection role is transformer differential protection, supported by additional protection, control, monitoring, metering, and disturbance-recording functions.
RET670 is designed for demanding transformer and substation applications where protection functions must be coordinated with CT characteristics, transformer vector group, breaker arrangement, and station communication. The A30 configuration should be treated as a specific application package rather than assuming every has the same hardware or software content.
RET670–1MRK004816-AC
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The biggest procurement mistake with older units is treating the short ordering code as if it describes the complete relay. It does not. The complete ordering string determines the actual hardware configuration and installed options.
Typical Applications
- Two-winding transformer protection with a single circuit breaker.
- Transformer differential protection using low-impedance differential protection with CT ratio matching and vector-group compensation.
- Transformer backup protection, including overcurrent, earth-fault and voltage-related functions depending on configuration.
- Substation protection and control, including station communication and disturbance analysis.
documentation describes differential protection with CT ratio matching and vector-group compensation, along with extensive backup and control functions.
Technical Pitfalls to Avoid
- Do not confuse 1MRK004816-AC with a generic .
The exact code identifies an A30, two-winding/single-breaker version 1.2. A different configuration may have materially different I/O and protection functions. - Check the complete ordering string before replacement.
A field replacement should match the hardware configuration, binary I/O, analog inputs, communication interfaces, auxiliary supply, and application package—not just “.” - Verify firmware and PCM600 project compatibility.
A physically compatible relay can still create commissioning problems if its firmware, application configuration, or engineering project does not correspond to the installed protection scheme. - Do not call this a line-differential relay based on reseller descriptions.
The strongest model-specific evidence identifies it as transformer protection, A30, 2W/1CB.
Related Products
- — Same basic two-winding/single-breaker application family represented by 1MRK004816-AC.
- — Two-winding transformer configuration for a different breaker arrangement; not automatically interchangeable.
- — Three-winding transformer configuration with a single-breaker arrangement.
- — Three-winding transformer configuration with multi-breaker arrangement.
- ABB RET650 — Transformer protection IED in the Relion family with a different application and hardware scope.
- ABB REF670 — Relion 670-series feeder protection platform; functionally different from .
- ABB RED670 — Line differential protection platform; do not substitute it for transformer protection without an application review.
- ABB REG670 — Generator protection IED in the same broader 670-series family.
- ABB PCM600 — Engineering environment used for configuring and maintaining compatible Relion protection IEDs.
Procurement Check
For 1MRK004816-AC, I would verify these items before approving a replacement:
- Exact short code: 1MRK004816-AC
- Complete ordering string
- Product version: 1.2
- A30 configuration
- Two-winding transformer application
- Single-breaker arrangement
- Auxiliary supply variant
- CT/VT input configuration
- Binary I/O configuration
- Communication modules and protocols
- Front-panel/display configuration
- Firmware revision
- Existing PCM600 project and application configuration
- Relay serial number and hardware revision
- Factory configuration versus previously modified field configuration
Procurement description:
ABB 1MRK004816-AC, Relion 670 Series, A30, 2-Winding Transformer Protection, Single Circuit Breaker, Product Version 1.2.
This is a much safer description than listing it simply as an “ABB digital protection relay,” because the A30 application and 1MRK004816-AC ordering code materially narrow the intended configuration.
