.Technical Specifications Rated Input Current: 1A / 5A configurable Rated Input Voltage: 120V AC Auxiliary Power Supply: 85‑264V AC, 88‑300V DC Digital Input Channels: Expanded multi‑channel digital input Programmable Output Contacts: Multi‑channel relay output contacts Communication Interfaces: Ethernet port, RS485 serial communication port Supported Protocols: Modbus TCP, Modbus RTU, DNP3 Operating Temperature: ‑40℃ ~ +70℃ Storage Temperature: ‑50℃ ~ +85℃ Relative Humidity: 5%‑95%, non‑condensing Mounting Form: Cabinet front‑panel mounting Certifications: CE, UL, IEC60255 protection relay compliance
Functional Features Expanded I/O resource meets complex on‑site interlock logic application requirements. Complete phase fault, ground fault and voltage related protection element library. Large‑capacity oscillography waveform storage and historical fault event recording function. Local man‑machine interface supports on‑site parameter browsing and modification operation. Powerful programmable logic function supports user customized interlock scheme. Full‑range hardware self‑diagnosis and remote fault alarm information reporting. Multi‑protocol communication interface realizes data interconnection with SCADA host system. Multiple setting group storage and switching adapts to various grid operation modes.
Application Scenarios Critical feeder protection for large‑scale utility substation. Medium‑voltage auxiliary distribution line protection inside power plant. Key power supply circuit safety monitoring for heavy‑industrial enterprises. Medium‑voltage bus backup protection application occasions. Power grid safety control system for large industrial park.
Performance Parameters Protection trip accuracy: ≤±2% of setting value Oscillography sampling rate: 64 samples for each power cycle Historical event storage capacity
Structural Characteristics Metal panel‑mount enclosure, compatible with SR750 series unified installation cut‑out dimension. Front panel integrates LCD display, operation push‑buttons and multicolor LED status indicator array. Rear large‑scale terminal block completes CT, VT, digital input‑output wiring connection.
Working Principle Analog current and voltage signals transmitted from instrument transformers enter signal conditioning circuit. Analog‑digital conversion unit converts analog physical quantity into digital signal.
Installation Requirements Install relay on standard control cabinet front‑panel with matched mounting cut‑out size.
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