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Description
Application ScenariosAt a 132/33 kV grid substation in the Midlands, three REF620 feeder-protection IEDs had been in service since 2011. One rainy November, the SCADA historian started showing gaps — disturbance records from a recent ground fault on the 33 kV bus were incomplete, and the relay’s local LCD flagged “Memory Test Fail” on cold start. The protection engineer pulled the relay cover and found the ABB 1MRK000179-CCR00 seated on its internal header; the SDRAM had simply reached fatigue after 13 years of continuous cyclic writes (event logs every breaker operation, disturbance records on every transient). Because the rest of the relay — CT/VT analog front-end, binary I/O, processor board — was still perfectly healthy, the utility opted for a board-level swap instead of a full IED replacement. With a spare 1MRK000179-CCR00 from the central stores, the swap took 20 minutes during a scheduled breaker outage: unseat the old module, seat the new, reload the setting file via PCM600, and run a disturbance-record test capture. The relay passed, the event log cleared, and the utility avoided a £6,500 new-IED purchase plus a day of panel rewiring. For the asset manager, the 1MRK000179-CCR00 is now on the “stock two per substation” list alongside the processor boards.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK000179-CCR00 |
| Manufacturer | ABB |
| Product Category | Memory Module (Storage Expansion Board) |
| Memory Capacity | 256 MB SDRAM (industrial-grade, cyclic-write optimized) |
| Operating Voltage | 24 V DC (drawn from host relay internal rail) |
| Power Consumption | ≤ 5 W |
| Operating Temperature | -25°C to +70°C (IEC 60255 relay-class) |
| Dimensions (W×H×D) | 84 × 95 × 28.5 mm (reference) |
| Weight | ~30–120 g |
| Interface | Internal board-to-board bus (host-backplane specific) |
| Mounting | Internal slot + screw fixation inside RELION IED chassis |
| Protection Class | IP20 (installed inside cabinet/relay housing) |
| Key Function | Stores event logs, disturbance records, configuration parameters |
Technical Principles and Innovative Values
- Innovation Point 1: Industrial SDRAM vs. Civilian DDR. The 1MRK000179-CCR00 isn’t a desktop memory stick — it’s a board-level SDRAM assembly qualified for -25°C to +70°C continuous duty, with error-mitigation suited to relay workloads (cyclic small-block writes rather than burst DMA). Where a PC DIMM would throw ECC-correctable errors after a few years in a sealed 60°C terminal box, the 1MRK000179-CCR00 is specified for exactly that envelope.
- Innovation Point 2: Firmware-Bound Storage Architecture. The module is hardware-locked to the host relay’s firmware build — the 1MRK000179-CCR00 doesn’t just “add RAM”; it’s the defined location where the RELION OS parks event buffers and COMTRADE disturbance files. Swapping in a non-matching memory board (different CCR revision or clone) can cause the relay to reject it at boot or, worse, corrupt the setting file. That’s why ABB ships this with a full 1MRK part number rather than as a commodity component.
- Innovation Point 3: Zero-Rewire Board-Level Recovery. Because the 1MRK000179-CCR00 carries no CT/VT terminations and no binary wiring, replacing it never touches the panel’s 48-core control cables. The entire “fault→diagnose→swap→reload settings→test” loop lives inside the relay housing. For utilities managing 50+ feeders per station, that difference turns a two-day panel job into a one-hour task.
Application Cases and Industry ValueA wind farm in Scotland operating 33 kV collection feeders behind REF620 IEDs noticed that after three years, two relays stopped retaining disturbance records longer than 48 hours — the COMTRADE files were truncating. The O&M team initially suspected firmware, but ABB’s remote support traced it to memory-cell exhaustion on the 1MRK000179-CCR00 (the farm’s event rate was unusually high due to frequent tap-changer ops on the export transformer). Swapping the ABB 1MRK000179-CCR00 boards during a quarterly maintenance visit restored full 30-event / 10-disturbance capacity per IEC 60255 expectations. The site engineer’s comment: “We’d budgeted for three new REF620s next CAPEX cycle. Two memory boards for under £800 killed that line item.”In a second case, a petrochemical plant running REJ620 earth-fault protection on its 6.6 kV motors used the 1MRK000179-CCR00 as part of a condition-based spares program. Relay self-tests had begun flagging “memory parity” warnings on one unit every cold start. Instead of waiting for a full failure during a process run (where a protection blind spot could mean a motor burn-down), the EE team proactively swapped the 1MRK000179-CCR00 on a planned outage. Post-swap, the parity warnings disappeared and the relay’s event log — critical for the plant’s forensic analysis after a trip — has stayed intact through two major process upsets.
