Technical Specifications Three‑phase current and voltage measurement inputs, multiple digital input channels, relay output contacts, industrial communication interface. Operating ambient temperature ‑20 ℃ to +65 ℃, storage temperature ‑40 ℃ to +85 ℃, relative humidity 5%‑95% non‑condensing. Front‑panel LCD display and operation keypad.
Functional Features Supports over‑current, ground‑fault, over‑voltage, under‑voltage, phase unbalance protection. Stores fault snapshot and operation event records. Measures three‑phase electrical parameters. Supports local on‑site operation and remote control via communication bus. Configurable alarm and trip output logic.
Application Scenarios Protection monitoring device for industrial power distribution cabinets, substation secondary equipment and plant power supply system.
Performance Parameters Reliable electrical measurement precision, configurable protection time‑delay characteristics, stable fault data storage and communication transmission performance.
Material Composition Flame‑retardant plastic housing. Main CPU processing circuit board, signal conditioning modules, relay output assemblies. Front‑panel LCD display and keypad assembly. Screw‑type field wiring terminal blocks. Metal mounting clip hardware.
Structural Characteristics Standard panel‑mount housing. Front panel contains LCD display, status LED indicators and operation push‑buttons. Rear side arranges CT/PT, digital I/O and communication wiring terminals. Mounting clips fix relay into cabinet panel cut‑out opening.
Working Principle Current and voltage signals from instrument transformers are sent to relay measurement terminals. Internal processor samples electrical data and executes protection algorithm calculation. Event data can be stored locally and uploaded to remote monitoring system.
Installation Requirements Fit relay into cabinet panel cut‑out and fasten mounting clips. Complete CT, PT and digital I/O wiring follow official wiring drawing. Connect communication cables. Power‑on unit, configure protection setting values, complete function test.
Usage Notes CT and PT secondary circuits must avoid open‑circuit risk. Protection setting parameters shall match actual protected equipment operating condition.
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