Technical Specifications Over‑voltage, under‑voltage, over‑frequency, under‑frequency and voltage‑unbalance protection function library. Custom‑configured analog input, binary input and binary output channels. Supports IEC61850, Modbus, IEC60870‑5‑103 communication protocols. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 11.7 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel IP40, rear terminal‑side IP20. Meets CE and IEC standard requirements.
Functional Features Executes voltage‑related protection for medium‑voltage bus‑bar and feeders. Realizes high‑precision voltage, frequency and phase‑sequence measurement. Collects primary equipment status signals, supports local and remote bay‑control. Saves fault event records and disturbance waveform data. Front‑panel man‑machine interface supports on‑site parameter configuration and status viewing. LED indicators reflect power, running, trip and alarm conditions. Built‑in hardware self‑diagnosis detects internal abnormalities and outputs alarm signals.
Application Scenarios Placed inside medium‑voltage switchgear cabinet. Used for bus‑bar voltage protection and monitoring of utility and industrial substations. Suitable for distribution automation projects requiring customized I/O channel allocation.
Performance Parameters Protection response time satisfies power‑system voltage‑protection standards. Disturbance recorder captures voltage transient sampling data. Event log supports millisecond‑level time‑stamp recording. Measurement accuracy meets substation monitoring specifications. Hardware faults generate definite alarm output.
Working Principle After power‑on completion of hardware self‑check, VT secondary voltage signals enter sampling circuit. Voltage‑protection algorithm continuously compares real‑time voltage and frequency values with setting values.
Installation Requirements Fix device firmly inside medium‑voltage switchgear cabinet. Connect auxiliary power supply strictly within rated voltage scope. Complete VT and binary‑loop wiring in accordance with engineering schematic drawings. Connect communication cables for remote monitoring function. Download voltage‑protection settings and project configuration files through supporting engineering software. Implement reliable protective grounding complying with power‑industry standards. Verify front‑panel LED working status after power‑on.
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