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SEG MRN3-11D
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Mitsubishi MR-S11-200-Z37
Mitsubishi MR-S11-200-Z37

SEG MRR1D

Product Name:​ SEG (Woodward) MRR1 Series Rotor Earth Fault & Field Protection Relay
Product Overview:​ A digital multifunction relay focused on synchronous generator rotor (field) circuit protection, including 100% stator-covering rotor ground fault detection.
Category:
Description
Technical Specifications:​
  • Rotor Ground Protection:​ DC/AC injection or superposition method; sensitivity adjustable down to 1–5 kΩ.
  • Field Overcurrent:​ 0.1 In – 20 In range, definite/time-inverse curves per IEC/IEEE.
  • Field Undercurrent:​ Anti-loss-of-excitation monitoring with adjustable delay.
  • Rectifier Monitoring:​ Detects diode arm failures in exciter bridges.
  • Outputs:​ Multiple programmable change-over contacts (alarm, trip, close).
  • Communication:​ RS-485 Modbus RTU, optional IEC 61850.
  • Environmental:​ -20°C to +70°C, 5–95% RH non-condensing.
    Functional Features:​
  • 100% Winding Coverage:​ Injection principle detects grounds near neutral and slip rings alike.
  • LCD Interface:​ Password-protected menu navigation in multiple languages.
    Application Scenarios:​ Hydro/turbo-generator excitation systems, large industrial synchronous motors, marine propulsion generators.
    Material & Structure:​ Flame-retardant molded enclosure, plug-in module design for ease of replacement.
    Working Principle:​ Injects a low-frequency signal into the rotor circuit or measures imbalance to detect insulation degradation; compares field current/voltage against setpoints for over/under conditions.
    Installation Requirements:​ Isolate rotor circuit during commissioning; connect injection electrodes per manual; ensure shielding on measurement leads.
    Precautions:​ Do not operate with rotor disconnected from injection circuit; periodic self-test recommended; verify compatibility with static exciter types (some methods may interfere).
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