Technical Specifications Phase‑CT secondary‑input:1 A. Low‑range control‑power‑supply:20‑60 VDC /20‑48 VAC. 4‑channels isolated 4‑20 mA analog outputs. 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. Full‑PCB conformal‑coating protection. 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 Generator‑protection functions including over‑current, over‑voltage, under‑voltage, reverse‑power, loss‑of‑excitation, over‑frequency, under‑frequency and ground‑fault protection. Generator electrical‑parameter real‑time metering capability. Fault‑oscillography and time‑stamped event‑recording storage. User‑programmable‑logic‑control equations. Local‑keypad‑LCD on‑site parameter‑configuration. Compatible with official 489PC configuration‑software tool. Conformal‑coating provides protection for damp‑and‑corrosive‑industrial‑environments.
Application Scenarios Small‑and‑medium‑land‑based generator‑sets protection systems. Emergency‑standby‑power‑plant generator monitoring. Distributed‑power‑generation‑station generator‑control‑points. Marine‑auxiliary‑generator‑protection‑systems. Remote‑site independent‑power‑supply generator‑units.
Performance Parameters Current‑measurement accuracy: ±1%. Voltage‑measurement accuracy: ±0.5%. Analog‑output accuracy: ±0.5% full scale. 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 operation.
Working Principle Generator‑current‑voltage‑signals are collected from external CT‑VT transformers. Internal micro‑processor executes generator‑protection‑algorithm‑judgment logic. Under fault‑conditions, trip‑or‑alarm‑relay‑output is triggered. Fault‑waveform‑and‑event‑information is stored to internal memory; parameter‑and‑status‑data is uploaded via Modbus‑communication‑interface to upper‑SCADA‑host‑system.
Installation Requirements Panel‑mount installation inside generator‑control‑cabinet. Adopt matched draw‑out‑base‑socket unit. Strictly follow generator‑system‑wiring official engineering‑drawing. Complete reliable protective‑grounding connection. Set CT‑ratio, VT‑ratio and generator‑nameplate‑parameters during commissioning phase.
Usage Notes Confirm field‑CT secondary‑side output is 1 A for P1 variant model. Verify actual control‑power‑supply voltage falls within LO low‑range specification. Do not scratch conformal‑coating protective layer in maintenance work. Execute protection‑logic simulation‑test before generator online‑operation. Do not pull out draw‑out drawer under live‑circuit working condition.
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