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SEG MRN3-11D
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Micromatik MPWR-136
Micromatik MPWR-136
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SEG MRR1D
SEG MRR1D

SEG MRN3-11D

Product Name:​ SEG (Woodward) MRN3 Series Mains Decoupling Relay
Product Overview:​ A microprocessor-based protective relay for generator-to-grid parallel operation, providing rapid disconnection under fault conditions to protect both grid and generation assets.
Category:
Description
Technical Specifications:​
  • Protection Functions:​ Over/under voltage, over/under frequency, df/dt (rate of change of frequency), vector surge detection.
  • Voltage Supervision:​ Two-step independent under/overvoltage per setpoint.
  • Frequency Supervision:​ Three-step under/over frequency with adjustable delays.
  • Communication:​ RS-485 (Modbus RTU optional), digital I/O for tripping.
  • Auxiliary Supply:​ 24 V DC, 48 V DC, 110 V AC/DC, or 220 V AC/DC (model-dependent).
  • Response Time:​ Extremely fast decoupling (<30 ms typical for vector surge).
  • Display:​ Alphanumeric LCD with LEDs for status.
    Functional Features:​
  • Dual Parameter Sets:​ Allows switching between different grid codes or generator modes.
  • Fault Recording:​ Stores up to 5–8 events with timestamps for post-mortem analysis.
  • Watchdog & Digital Filtering:​ Enhances measurement stability using DFT to suppress harmonics.
    Application Scenarios:​ Distributed photovoltaic inverters, biogas/gen-set paralleling, microgrid interconnection points, utility-scale renewable plants.
    Material & Structure:​ DIN-rail or panel-mounted enclosure (front IP54, rear IP20); terminal blocks for CT/VT inputs and relay outputs (5 A @ 250 V AC contacts).
    Working Principle:​ Continuously samples grid voltage/frequency via PT/CT inputs, processes via DSP; triggers solid-state or electromechanical trip outputs when thresholds or df/dt exceed safe limits.
    Installation Requirements:​ Proper VT/CT wiring with polarity checked; shielded cables for analog inputs; separate routing of power and signal wires.
    Precautions:​ Configure vector surge sensitivity carefully to avoid nuisance tripping; ensure earthing of relay chassis; verify firmware matches regional grid protection standards (VDEW, IEEE).
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