Technical Specifications Phase‑CT secondary‑input:5 A. High‑range control‑power‑supply:70‑265 VAC /90‑300 VDC. Winding‑temperature monitoring function group. Enhanced multi‑mode ground‑fault protection logic. Multiple opto‑isolated digital‑input and Form‑C relay‑output channels. Communication interfaces: front RS232 local‑port, dual‑rear‑RS485 ports. Supported protocol: Modbus RTU, DNP3.0. Back‑lit‑LCD‑display. Operating Temperature:‑40 °C to +70 °C Storage Temperature:‑50 °C to +85 °C Relative Humidity:5%‑95%, non‑condensing Mechanical Dimension: Draw‑out drawer‑type panel‑mount unit
Functional Features Comprehensive transformer‑protection functions: differential protection, over‑current, over‑voltage, under‑voltage, over‑excitation, ground‑fault, winding‑over‑temperature protection. Real‑time transformer electrical‑parameter metering capability. Winding‑temperature data acquisition and over‑temperature alarm/trip logic. Fault‑oscillography and time‑stamped event‑recording storage. User‑programmable‑logic‑control equations. Local‑keypad‑LCD on‑site parameter‑configuration. Compatible with official EnerVista configuration‑software tool.
Application Scenarios Power‑plant step‑up transformer protection and monitoring. Utility substation main‑power‑transformer control‑points. Industrial‑plant large‑capacity distribution‑transformer protection systems. Petrochemical‑factory substation transformer‑safety‑control‑cabinets.
Performance Parameters Current‑measurement accuracy: ±1%. Voltage‑measurement accuracy: ±0.5%. Differential‑protection operating precision: compliant with transformer‑protection industry standard. Relay contact resistive rating:250 VAC /5 A.
Structural Characteristics Draw‑out plug‑in drawer‑type mechanical‑construction. Front‑panel LCD‑keypad‑human‑machine‑interface assembly. Front‑side RS232 local‑configuration‑port. Dual‑rear‑side RS485‑communication‑ports. Rear‑side multi‑pin gold‑plated draw‑out‑connector. Drawer‑pull‑handle for convenient maintenance without field‑wiring disconnection.
Working Principle Three‑phase current‑voltage signals are collected from transformer‑side CT‑VT instrument transformers; winding‑temperature signals are acquired from external temperature sensors. Internal micro‑processor executes transformer‑differential‑protection and multi‑condition‑fault‑judgment algorithms. When internal or external transformer fault condition is detected, trip‑relay‑output for transformer main‑breaker is triggered. Fault waveform and event logs are stored, and real‑time data is uploaded to SCADA‑host‑system via communication bus.
Installation Requirements Panel‑mount installation inside transformer‑protection‑cabinet. Adopt matched draw‑out‑base‑socket unit. Strictly implement CT‑VT‑temperature‑loop‑wiring following official engineering‑drawing. Complete reliable protective‑grounding connection. Set CT‑ratio, transformer‑turn‑ratio and protection‑threshold‑parameters during commissioning phase.
Usage Notes Confirm field‑CT secondary‑side output is 5 A for P5 variant model. Verify HI‑range control‑power‑supply actual voltage‑value. Calibrate differential‑protection current balance during commissioning work. Execute protection‑logic simulation‑test before transformer online‑put‑into‑service. Do not pull out draw‑out drawer under live‑circuit working condition.
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