Technical Specifications CT input:1A/5A; PT input:100V; Power supply:24‑250VDC / 110‑240VAC Operating temperature:‑40℃~+70℃; Humidity:5‑95% non‑condensing Mounting:panel cut‑out mounting; Communication:Ethernet, RS485; Protocols:Modbus, IEC61850, DNP3
Functional Features Motor overload, locked‑rotor, phase unbalance, earth‑fault, over‑voltage and under‑voltage protection. Motor thermal model. Breaker control, event log and oscillography. Local LCD operation and LED status indication.
Application Scenarios Medium‑voltage large motor protection for power plants, mining and heavy‑industry sites. Spare replacement unit for motor protection retrofit projects.
Performance Parameters Protection response time ≤50ms; High‑precision analog sampling; Non‑volatile memory for fault waveform and event records.
Material Composition Flame‑retardant ABS housing; Conformal‑coated multi‑layer PCB; Sampling transformers, DSP chip, relay contacts, screw terminals and LCD assembly.
Structural Characteristics Panel‑mount enclosure; Front panel equipped with LCD, keypad and LED indicators; All field wiring terminals on rear side; Lockable transparent front cover.
Working Principle CT and PT secondary signals feed rear terminals. Hardware isolation circuit sends sampled signals to DSP. Protection algorithms run continuously. Trip relay outputs activate when fault thresholds are triggered. Data exchanges with SCADA system via communication ports.
Installation Requirements Disconnect CT, VT and auxiliary power before installation. Install unit into cabinet panel cut‑out. Complete wiring according to official drawings. Download parameter setting, perform I/O test and commissioning.
Usage Notes Never open energized CT secondary loop. Keep cabinet well‑ventilated. Apply anti‑static measures during handling. Check terminal torque periodically.
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