Technical Specifications Over‑current and earth‑fault protection, built‑in communication interface. Rated current input 5 A. Auxiliary power supply 80‑265 V AC/DC. Operating temperature ‑25 ℃ to +70 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel IP40, rear terminal area IP20. Complies with IEC 60255 international protection relay standards.
Functional Features Configurable multi‑stage over‑current and earth‑fault protection logic. Realizes electrical quantity measurement. Front‑panel display supports parameter setting and fault record checking. Relay contact outputs trip and alarm signal. Supports communication data upload to host monitoring system. Built‑in abundant fault event storage.
Application Scenarios Used for distribution feeder protection in power plant and substation. Applied for new power distribution project, equipment renovation and spare‑part replacement.
Performance Parameters Protection action time satisfies distribution network protection coordination requirement. Measurement accuracy meets site monitoring requirement. Communication data transmission keeps stable. Fault storage capacity is improved compared with basic version.
Material Composition Metal alloy housing. High‑performance protection processing chip, signal sampling circuit. LCD display and operation button assembly. Screw‑type heavy‑current wiring terminals. Copper‑alloy relay contact components, communication isolation circuit.
Structural Characteristics Standard panel‑mount structure. Front‑panel equipped with display screen and operation buttons. Rear side arranges CT input, power supply, contact output and communication terminals.
Working Principle After power‑on, relay completes hardware self‑check. It samples CT secondary current signal. Internal processor executes protection algorithm according to configured setting value. When fault condition triggers, relay outputs trip or alarm contact signal.
Installation Requirements Fix relay on cabinet panel with matching mounting accessory. Complete secondary circuit wiring strictly follow engineering schematic. Guarantee cabinet protective grounding. Set protection parameters after power‑on.
Usage Notes Secondary current loop shall not be open‑circuited. Avoid strong electromagnetic interference environment. Periodically inspect terminal tightening condition. Back‑up setting parameters before parameter modification. Follow power operation safety specification during commissioning.
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