Description
Rated measuring input: AC 20‑50 V
System frequency: 50 Hz / 60 Hz
Auxiliary supply: Wide‑range DC auxiliary power supply
Time‑delay setting range: 0.1‑10 s adjustable for each stage
Reset mode: Manual / automatic reset selectable
Output contacts: Multiple change‑over relay contacts for trip and alarm signals
Indicators: LED indicators for start, trip and operational status
Mounting: Plug‑in module for 19‑inch rack 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, IEC 60255 approval
Two‑stage independent over‑voltage / under‑voltage protection, freely assign function for each stage.
Stage 1: selectable definite‑time or inverse‑time delay characteristic.
Stage 2: definite‑time delay protection function.
Third‑harmonic‑based stator earth‑fault supervision (with optional filter accessory)ABB У….
Adjustable voltage threshold and time‑delay parameters for each protection stage.
Trip and alarm relay contact output, local LED status indication.
Continuous hardware self‑diagnosis for internal circuit fault detection.
Manual or automatic reset mode for protection operation.
Parameter setting completed by potentiometers and DIP switches on front panel.
Plug‑in installation inside 19‑inch standard protection rack. Strictly follow VT polarity for voltage‑circuit wiring, avoid voltage‑circuit short‑circuit risk. Auxiliary power supply shall keep within rated range. After module replacement, complete protection setting verification, operate‑condition simulation test for each stage, check trip‑alarm contact action. Confirm no self‑diagnosis fault indication.
Generator stator earth‑fault supervision based on third‑harmonic voltage; over‑voltage / under‑voltage monitoring for generator and transformer auxiliary‑voltage circuits; neutral‑point voltage supervision in power plants and substationsABB У….
- Two‑stage independent voltage‑protection design, flexible function assignment for over‑voltage / under‑voltage.
- Multiple time‑delay characteristic options, adaptive for different protection coordination requirements.
- Support third‑harmonic measuring function for generator stator earth‑fault monitoring with filter accessory.
- Plug‑in modular structure, convenient for on‑site replacement and maintenance.
- Local LED status indication, manual / automatic reset configurable.
- Discontinued legacy ABB spare‑part, used for maintenance and retrofitting of existing RX‑series protection assemblies.
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