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3. Key Technical Specifications
Exact sub‑variant data for REM545BG229AABA is defined by ABB’s option code structure; always confirm against the specific datasheet and wiring diagram before final design or retrofit. The list below reflects typical REM545 / REM54 series behavior and must be verified for this order code.
- Device type: Numerical motor/generator protection and control relay (machine terminal)
- Typical applications: Medium‑voltage motors, small and medium generators, generator‑transformer units
- Measurement inputs: Multiple CT inputs (1 A / 5 A), multiple VT inputs (100–120 V) depending on hardware variant
- Protection functions (typical family set): Overcurrent (50/51), thermal overload (49), earth fault, negative sequence (46), under/overvoltage (27/59), frequency protection (81U/81O), power/underpower, loss of excitation, overexcitation
- Auxiliary supply (typical family range): Wide‑range AC/DC auxiliary, commonly around 80–265 V AC / 90–250 V DC (verify label for exact range)
- Outputs: Several trip/close contacts and configurable signal outputs, with trip‑circuit supervision in many variants
- Communications: Variants support serial or Ethernet‑based protocols (for example IEC 60870‑5‑103, Modbus, or vendor‑specific links), check the communication option in the code string
- Mounting: Flush panel mounting or 19‑inch rack mounting depending on case ordered
- Operating temperature: Industrial relay range suitable for substation / MCC rooms
- Compliance: Designed in line with IEC 60255 and related protection relay standards
Because ABB offers several hardware builds under REM545, you must use the full ordering code REM545BG229AABA plus the 1MRS document number to pull the correct technical manual and wiring details.
4. Product Introduction
The ABB REM545BG229AABA 1MRS110025-001 is a REM 54 series numerical protection and control relay used as a machine terminal for motors and generators. It sits in the protection panel or MCC and handles protection, measurement, and control of rotating machines using CT and VT inputs.
Engineers pick this unit when they need a single device to cover multiple ANSI protection functions, condition monitoring, and breaker control for critical motors and generators, rather than a patchwork of discrete relays. In brownfield plants it is typically used as a like‑for‑like replacement, so matching the exact code REM545BG229AABA is important to avoid wiring or function mismatches.
- REM545BG229AABA
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Relay display is completely dark, no LEDs | No auxiliary supply or tripped panel fuse | ✅ High | Measure auxiliary supply at the relay terminals against the rated range on the nameplate | If there is no voltage, fix the supply; if voltage is correct and the relay stays dead, the relay is likely defective and replacement is justified |
| Relay powers up but does not measure current/voltage | CT/VT wiring issue, wrong input configuration | ✅ Medium | Check CT/VT secondary wiring against the connection diagram; use a secondary injection or clamp meter to verify current actually reaches the terminals | Correct wiring and configuration first; only suspect the relay if wiring and injection tests are good but readings stay zero or erratic |
| Nuisance trips on overcurrent or earth fault | Incorrect settings, wrong CT ratio, or reversed polarity | ✅ Medium | Compare current settings to the coordination study and previous backup; confirm CT ratio and polarity in both wiring and settings | Adjust settings and correct CT issues; if trip recording shows impossible waveforms, then the relay input hardware may be faulty |
| Relay shows internal error / self‑supervision alarm | Internal hardware or firmware fault | ✅ High | Note the exact error code and time, power‑cycle once under controlled conditions, and check if the error reappears | If self‑supervision alarms return after a clean power‑cycle and settings check, treat the relay as failed and plan a replacement unit |
| Breaker does not operate from relay commands | Output contact wiring problem, interlock in breaker circuit | ✅ Medium | Use the relay’s output test function (if available) to energize trip/close contacts, and measure continuity at the output terminals | If outputs change state electrically and the breaker does not move, fix the breaker circuit; if outputs never change even in test, the relay’s output board may be damaged |
| Communication lost to SCADA / DCS | Network wiring fault or protocol mismatch | ✅ Low–Medium | Check physical ports and cabling, confirm settings (address, baud rate, IP, protocol) against the SCADA configuration | Communication loss alone rarely means the relay is bad; stabilize the network first before considering relay replacement |
| Multiple different motors on the same panel are tripping together | Supply disturbance or upstream fault, not relay hardware | ❌ Low | Correlate event logs from the relay with upstream protection and recorder data | Focus on system‑level faults first; only replace the relay if its behavior is inconsistent with measured system events |
If the root cause is not clear, pull and save the disturbance records, event list, and setting file, and send them with panel photos to your protection engineer before swapping the relay.
6. Frequently Asked Questions (FAQ)
Q1. What is ABB REM545BG229AABA 1MRS110025-001 actually used for?
This code refers to an ABB REM 545 machine terminal variant used for protection, control, and monitoring of motors and generators. It takes CT/VT inputs, applies multiple protection functions, and drives trip/close outputs to breakers or contactors.
Q2. Is REM545BG229AABA a direct replacement for any REM545 relay?
No. REM545 has many hardware and function variants. You must match the complete code (REM545BG229AABA) and case style, and ideally confirm the internal option list against the existing relay’s nameplate and setting printouts. Swapping in a different hardware variant can leave you missing inputs, outputs, or communication options.
Q3. Will I lose settings if I replace this relay with a new one?
If you simply pull the old relay and insert a new unit without restoring a configuration file, you will not have your original settings. Before removal, always download or print the full settings and disturbance records. Then, after installing the new device, load the configuration using ABB’s relay configuration software and verify key set points and I/O mappings before putting it back in service.
Q4. Can I hot‑swap the REM545 while the motor or generator is running?
That is a bad idea. The relay is part of the protection chain; removing it live can leave the machine unprotected or cause unintended trips. Take the feeder or machine out of service, isolate control and auxiliary supplies as per your plant’s safety procedures, and only then replace the relay.
Q5. Why is a surplus REM545BG229AABA cheaper than a new relay from ABB?
Surplus units usually come from project overstock or decommissioned panels, not from a fresh factory order. They can still be New Original / New Surplus if they were never energized, but they do not carry the same commercial structure as a new relay from ABB. The key is that the seller can explain the origin, test procedures, and warranty terms clearly.
Q6. Does this relay support modern communication like IEC 61850?
Some REM 54 family devices support specific communication protocols, but the exact options are defined by the ordering code and internal boards. Do not assume IEC 61850 or any other protocol; check the communication option in the manual for REM545BG229AABA and confirm it matches your SCADA/DCS requirements before purchase.
Q7. What should I check before I blame the relay and order a replacement?
First, verify auxiliary supply quality, CT/VT wiring, breaker control circuits, and protection settings against your coordination study. Many “relay faults” turn out to be wiring mistakes, bad CTs, or mis‑applied settings. Once those are ruled out and the relay still shows self‑supervision errors, inconsistent measurements, or refuses to power up, then replacing it with a correctly matched REM545BG229AABA is a reasonable next step.
