Description
CT secondary rated: 1 A / 5 A configurable
System frequency: 50 Hz / 60 Hz
Differential operating time: Typical 10‑15 ms for internal busbar faults
Auxiliary supply: 24‑250 V DC
Total power consumption: ≤40 W
CT input quantity: Maximum 6 three‑phase feeder current inputs
Binary input / output: Configurable plug‑in I/O modules
Communication interfaces: SPA optical port, LON bus, IEC 60870‑5‑103 serial interface
Fault recording: COMTRADE disturbance waveform storage, large‑capacity event log
Mounting mode: 19‑inch standard rack‑mount chassis
Operating temperature: −25 ℃ ~ +70 ℃
Storage temperature: −40 ℃ ~ +85 ℃
Humidity: 5‑95 %RH non‑condensing
EMC compliance: IEC 60255‑22‑1 /‑22‑2 /‑22‑3
Certifications: CE, UL, IEC 60255 approval
Core low‑impedance busbar differential protection, with restraint characteristic to resist external fault CT saturation. Built‑in CT circuit open‑circuit detection function to prevent false operation. Breaker failure protection, overcurrent backup protection, fault event recording and disturbance waveform storage. Collect breaker and disconnector auxiliary contact status via binary input modules, output trip and alarm commands through binary output relays. Local HMI for status display and parameter browsing; parameter configuration via PC engineering tool. Complete continuous hardware self‑diagnosis, report internal module fault alarm.
Difference compared with REB670: RED521 is early‑generation busbar protection IED; no native IEC 61850 support. REB670 belongs to Relion 670 new‑generation platform with IEC 61850 and GOOSE function, hardware structure is completely different and cannot direct drop‑in replacement.
Installed in 19‑inch standard rack of substation protection cabinet. Strictly follow CT polarity requirements for current loop wiring, prohibit CT secondary open‑circuit. Auxiliary power supply shall be within rated DC range. After replacement, download complete project configuration, execute differential protection logic test, CT polarity verification, trip‑loop action test, and communication test with station control system. Check self‑diagnosis status to confirm no hardware fault alarms.
Used for single‑bus and double‑bus busbar protection in power plants and high‑voltage substations. Widely deployed in legacy power grid and industrial power distribution secondary protection systems.
- Early‑generation numerical low‑impedance busbar differential protection IED, fast fault tripping performance.
- Excellent stability under heavy CT saturation, built‑in CT open‑circuit detection function.
- Support mixed 1 A / 5 A CT input, no intermediate CT required.
- Modular plug‑in hardware structure, convenient for on‑site module replacement and maintenance.
- Integrated disturbance recording, event logging and comprehensive hardware self‑diagnosis.
- Official discontinued ABB spare‑part, for maintenance and retrofitting of legacy busbar protection systems.
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