Description
CT secondary rated: 1 A / 5 A configurable
VT secondary rated: 100 V
System frequency: 50 Hz / 60 Hz
Auxiliary supply: 85‑265 V AC / DC universal wide‑range power
Total power consumption: ≤25 W
Local HMI: Graphic LCD display, LED status indicators and operation push‑buttons
Communication interfaces: RS485 serial port, LON bus interface, local service port
Fault recording: COMTRADE disturbance waveform storage, time‑stamped sequential‑of‑event log
Mounting mode: Panel flush‑mount installation
Operating temperature: −25 ℃ ~ +55 ℃
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
Non‑directional and directional multi‑stage phase overcurrent protection, earth‑fault protection, sensitive earth‑fault protection, thermal overload protection, phase unbalance and phase‑sequence supervision.
Motor‑related protection functions: start‑up time supervision, locked‑rotor monitoring, anti‑frequent‑start inhibition.
Breaker‑failure protection, configurable multi‑shot auto‑reclosing function.
Local & remote circuit‑breaker control, bay‑level interlock logic and trip‑circuit supervision.
True‑RMS high‑accuracy measurement for current, voltage, active/reactive power, energy, power‑factor and frequency; harmonic distortion THD monitoring available.
User‑programmable logic for custom interlock and alarm logic.
Sequential‑of‑event logging, COMTRADE fault disturbance recording and multiple setting‑group management.
Continuous hardware self‑diagnosis detects internal faults and outputs alarm signals to local HMI and upper‑level station control system.
Configuration and commissioning are completed via CAP501 / CAP505 engineering softwareeero。
Flush‑panel mounting inside substation protection cabinet. Strictly follow CT/VT polarity for secondary wiring, avoid CT secondary open‑circuit hazard. Auxiliary power supply shall be kept within rated voltage range. After unit replacement, download complete project configuration file. Perform protection‑logic verification test, breaker trip‑close loop test, binary input/output point‑to‑point signal test and communication validation with SCADA system. Confirm no hardware self‑diagnosis fault alarms.
Medium‑voltage incoming‑feeder, outgoing‑feeder protection for power plants, industrial sites and utility distribution substations. Also applicable for medium‑voltage motor protection and acts as backup protection for transformer baysABB Group。
- REX521 series high‑grade multifunction protection relay, compact panel‑mount structure for secondary cabinet installation.
- Rich integrated protection function library, suitable for distribution feeders and medium‑voltage motor protection applications.
- Built‑in user‑programmable logic function to realize customized interlock and alarm schemes.
- Supports electrical wear monitoring of circuit breaker, trip‑circuit supervision and power‑quality harmonic measurement.
- Integrated true‑RMS measurement, time‑stamped event logging and COMTRADE disturbance‑recording functions.
- Multiple industrial communication protocols supported for connection to substation automation systems.
- Discontinued legacy ABB spare‑part, used for maintenance and retrofitting of existing REX521‑series protection devices.
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