Technical Specifications Phase‑CT secondary‑input:1 A. High‑range control‑power‑supply:70‑265 VAC /90‑300 VDC. 4‑channels isolated 4‑20 mA analog outputs. Standard ground‑fault‑protection logic set. High‑resolution fault oscillography recording function. Sequence‑of‑events recording capability. 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. Full‑PCB conformal‑coating protection. Back‑lit‑LCD‑display for harsh‑environment. 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 Complete feeder‑protection‑function library: phase over‑current, ground‑fault, over‑voltage, under‑voltage, over‑frequency, under‑frequency protection. Real‑time feeder electrical‑parameter metering capability. High‑resolution fault‑oscillography waveform storage. Sequence‑of‑events time‑stamped recording function. User‑programmable‑logic‑control equations. Local‑keypad‑LCD on‑site parameter‑configuration operation. Full compatibility with official EnerVista configuration‑software tool. Conformal‑coating and enhanced‑hardware resist moisture, dust and trace‑corrosive‑gas erosion under harsh‑industrial‑site conditions.
Application Scenarios Utility‑substation distribution‑feeder protection control‑points. Industrial‑plant internal power‑distribution‑substation feeder‑protection systems. Petrochemical‑factory power‑supply‑distribution‑feeder monitoring‑cabinets. Remote‑area power‑grid distribution‑feeder protection application sites.
Performance Parameters Current‑measurement accuracy: ±1%. Voltage‑measurement accuracy: ±0.5%. Analog‑output accuracy: ±0.5% full scale. Oscillography sampling resolution: meets distribution‑protection industry standard. Relay contact resistive rating:250 VAC /5 A.
Structural Characteristics Draw‑out plug‑in drawer‑type mechanical‑construction. Front‑panel harsh‑environment‑grade 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 Feeder‑side current‑voltage‑signals are continuously sampled from external CT‑VT instrument transformers. Internal micro‑processor executes multi‑set feeder‑protection‑algorithm‑judgment logic. When fault‑condition is detected, trip‑or‑alarm‑relay‑output action is triggered. High‑resolution fault‑waveform and sequence‑of‑events records are stored inside non‑volatile memory; real‑time‑operating‑data is transmitted to upper‑SCADA‑host‑system via Modbus RTU / DNP3.0 communication bus.
Installation Requirements Panel‑mount installation inside feeder‑protection‑control‑cabinet. Install matched supporting draw‑out‑base‑socket unit. Strictly follow CT‑VT‑signal‑loop official‑engineering‑wiring‑drawing. Implement reliable cabinet protective‑grounding connection. Set CT‑ratio and all protection‑threshold‑parameters during commissioning work.
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