Description
Product Introduction
Busbar faults are where operators lose entire sections of a substation in milliseconds, so engineers usually stop gambling on aging static protection hardware once nuisance trips or CT saturation problems begin showing up. ABB REB670 1MRK002820-AC is a Relion 670-series numerical busbar protection IED built for medium-voltage through extra-high-voltage substations.
The relay combines differential protection, breaker failure logic, dynamic zone selection, event recording, and IEC 61850 communication inside a single platform. ABB REB670 1MRK002820-AC is commonly deployed in double-bus and one-and-a-half breaker schemes where fast fault isolation and CT saturation stability matter more than panel simplicity. Typical trip operation is ≤20 ms, but exact response depends on configuration and bay count.
Key Selling Points & Differentiators
- ABB REB670 1MRK002820-AC supports selective differential protection for single bus, double bus, transfer bus, mesh, and 1½ breaker substations.
- Typical protection operation time is ≤20 ms with processing speeds around 550 μs according to published technical references.
- IEC 61850 with GOOSE and MMS communication support allows integration into modern digital substations and centralized SCADA architectures.
- Compared with older hardwired differential schemes, this relay reduces external auxiliary relay logic and improves event diagnostics through integrated recording and disturbance analysis.
- Every outgoing ABB REB670 1MRK002820-AC spare should undergo startup diagnostics, communication testing, CT supervision checks, and minimum 24-hour powered runtime observation before export.
- Test evidence can include LCD startup photos, firmware screenshots, Ethernet communication logs, and relay self-test status captures.
- Not recommended for installations where CT polarity records, isolator replica logic, or existing substation configuration files are unavailable. Most commissioning delays come from undocumented legacy wiring changes.
- Functional testing and commissioning verification should align with IEC 60255 relay protection practices and documented utility acceptance procedures.
