Technical Specifications Transformer differential protection, over‑current, earth‑fault, over‑voltage and thermal overload protection function groups. Standard analog input, binary input and binary output channel configuration. Supports IEC61850, Modbus, IEC60870‑5‑103 communication protocols. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 12.8 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel protection grade IP40, rear terminal area IP20. CE and IEC standard certifications are available.
Functional Features Provides differential main‑protection and multi‑backup‑protection for medium‑voltage power transformers. Measures transformer‑side current, voltage, power and energy parameters. Collects status signals of transformer‑side circuit‑breakers and disconnectors, realizes local and remote bay‑control. Stores sequence‑of‑event logs and disturbance fault waveforms. Front‑panel HMI completes parameter setting and status browsing. LED indicators display power supply, running, trip and alarm status. Built‑in hardware self‑diagnosis monitors internal operating condition continuously.
Application Scenarios Installed inside transformer bay control cabinet. Applied for protection and control of distribution transformers in utility substations and industrial enterprises. Suitable for new‑built and retrofitted medium‑voltage substation automation projects.
Performance Parameters Protection operation speed conforms to transformer‑protection standards. Disturbance recorder captures high‑resolution fault transient waveforms.
Material Composition Multi‑layer glass‑fiber epoxy printed circuit board for main control unit. Industrial‑grade signal sampling and transformer‑protection processing semiconductor chips. Gold‑plated spring‑type connection terminals. Front‑panel HMI assembly with LCD display and operation keys. Flame‑retardant metal‑plastic composite housing material. Copper‑alloy spring‑contact internal connectors.
Installation Requirements Secure device firmly inside transformer bay control cabinet. Connect auxiliary power supply within rated operating voltage range. Wire multi‑side CT, VT and binary loops strictly following engineering schematic drawings. Deploy communication cables for remote monitoring function. Download transformer‑protection settings and project configuration files by supporting engineering software. Complete protective grounding complying with substation specifications. Inspect front‑panel LED working state after power‑on.
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