DescriptionThe ABB 1MRK002133-ABR02​ is an OEM PC board (printed circuit board assembly) manufactured by ABB as a core internal spare for the REL670 series of high-voltage line protection relays — ABB’s Relion® 670-platform workhorse for 220 kV, 400 kV, and generator–transformer interface protection. Within the REL670 rack-mounted IED, the 1MRK002133-ABR02​ typically serves as an analog acquisition / binary I/O conditioning board (the “ABR” designation within the 1MRK family commonly maps to Analog/Binary or arc/protection-related interface layers), handling the signal-path work between the CT/VT secondary wiring and the relay’s main processing board. It is a board-level component built for the EMI-heavy, vibration-stable environment of transmission substations where measurement integrity directly determines whether a distance or differential trip gets it right.Application ScenariosAt a 400 kV grid substation in northern Spain, three REL670 relays protect the generator–transformer tie lines feeding the national grid. One unit, commissioned in 2009, began logging “analog channel 2 deviation >0.8%” during the annual protection test — the A-phase current on one incoming CT circuit was reading consistently 1.2% high at full load, though still within trip margin. The protection engineer traced the drift to a degraded precision resistor network on the ABB 1MRK002133-ABR02, the analog-input conditioning board seated in the REL670’s internal PCB stack. Because the relay’s processor, communication, and power boards were otherwise healthy, the utility chose a board-level swap instead of replacing the entire REL670 (which would have meant re-terminating 60+ CT/VT cores and re-commissioning distance zones). With a spare 1MRK002133-ABR02​ from central stores, the swap took 35 minutes during a scheduled grid-islanding window: release the REL670 front bezel, extract the PCB stack, undo the ABR02​ keeper screw, seat the replacement, and re-run the secondary injection. Post-swap, all six analog channels came back within ±0.1% of primary reference. The saved CAPEX: roughly €9,500 vs. a new REL670 at €28,000, plus two days of panel rewiring avoided. For the TSO’s asset manager, the 1MRK002133-ABR02​ is now on the “one spare per 6–8 REL670 racks” list.

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Technical Principles and Innovative Values

• Innovation Point 1: Precision Analog Front-End for 400 kV Scaling.​ The 1MRK002133-ABR02​ carries the resistor-ladder and anti-alias filtering that scales 1 A / 5 A CT secondaries and 100 V VT secondaries into the REL670’s ADC range. At transmission level, where a 0.5% gain error on a 400 kV distance zone can mean overshooting or undershooting a 80 km line reach, the ABR02‘s component grading (low-drift metal-film networks, matched tempco) is what keeps zone-1/zone-2 coordination intact across seasonal temperature swings in outdoor GIS bays.
• Innovation Point 2: Binary I/O Galvanic Isolation.​ The board also services the REL670’s binary inputs (trip, close, block, test) and outputs (trip coil, signal relay). Each channel on the ABB 1MRK002133-ABR02​ is optically isolated from the logic side, so a stuck DC auxiliary contact or a surge from a breaker close-coil doesn’t propagate into the processor. This separation is why a failing binary channel rarely takes down the whole relay — just the ABR02​ needs swapping.
• Innovation Point 3: PCB-Stack Serviceability.​ Like its siblings in the 1MRK family, the 1MRK002133-ABR02​ is designed for tool-free extraction from the REL670’s internal guide rails. No panel rewiring, no setting-file migration (settings live on the processor board’s flash). The “ABR02” revision is mechanically and electrically pinned to the REL670 BOM it shipped with — ABB doesn’t treat this as a commodity PCB, which is why mix-and-match with ABR01/ABR03 is discouraged without a BOM cross-check.