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- Woodward XR1
  
  Rotor Earth Fault Protection Relay (Not Governor Controller)
  
  Manufacturer: Woodward (原 SEG Electronics)
  
  Part No: XR1
  
  Type: Synchronous machine rotor earth fault protection relay (two‑stage: alarm + trip)
  
  Overview
  
  The Woodward XR1 is a DIN‑rail mounted protection relay for detecting rotor winding earth faults in synchronous generators/motors. It provides two‑stage protection (alarm for high‑resistance faults, trip for low‑resistance faults) to prevent rotor insulation damage and machine failure.
  
  Specifications
  
  Function: Rotor earth fault detection (high/low impedance)
  
  Protection Stages: 2 (alarm R<, trip R<<)
  
  Resistance Settings:
  
  Alarm (R<): 20–140 kΩ (continuous)wss.woodward.com
  
  Trip (R<<): 0–30 kΩ (continuous)wss.woodward.com
  
  Time Delays:
  
  Alarm (tR<): 0–25 s / 0–50 swss.woodward.com
  
  Trip (tR<<): 0–10 s / 0–20 swss.woodward.com
  
  Auxiliary Voltage: 19–390 VDC / 36–275 VAC (40–70 Hz)
  
  Power Consumption: 4 W
  
  Output Relays: 2 × changeover contacts (alarm/trip)
  
  Contact Rating: 250 VAC, 1250 VA (ohmic)
  
  Measuring Circuit: ±24 V, 1 Hz, short‑circuit proof
  
  Mounting: DIN rail (EN 50022)
  
  Enclosure: IP40 (front cover, sealable)
  
  Dimensions (W×H×D): ~70 × 100 × 120 mm
  
  Weight: ~0.5 kgwss.woodward.com
  
  Standards: IEC 60255‑1
  
  Key Features
  
  Two‑Stage Protection: Separates alarm (high‑R) and trip (low‑R) for graded response.
  
  Wide Voltage Range: Universal AC/DC power supply (19–390 VDC / 36–275 VAC).
  
  Adjustable Settings: DIP switches and potentiometers for on‑site calibrationwss.woodward.com.
  
  Self‑Test: Integrated pushbutton for functional verification.
  
  Compact & Rugged: DIN‑rail mount, IP40 enclosure, self‑extinguishing casewss.woodward.com.
  
  No Sampling Needed: Direct connection to rotor circuit; simple installation.
  
  Applications
  
  Synchronous Generators: Rotor earth fault protection (power plants, utilities).
  
  Synchronous Motors: Rotor winding insulation monitoring (industrial drives).
  
  Brush/Brushless Machines: Compatible with both rotor types.
  
  Critical Assets: Prevents costly downtime from rotor insulation failure.

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Woodward XR1 Governor Controller

Woodward XR1

Rotor Earth Fault Protection Relay (Not Governor Controller)

Overview

Specifications

Key Features

Applications

WOODWARD

XR1

PLC Module

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