Professional Line – XR1
Rotor Earth Fault Protection
Protection relay XR1 of our PROFESSIONAL LINE is used for detection of rotor earth faults in synchronous machines. The earth fault element detects high and low impedance earth faults in rotor windings and is in two stage design (for alarm and trip).
- Advanced Fault Detection: Detects both high and low resistance rotor earth faults, preventing insulation failure.
- Two-Stage Protection: Separate settings for an alarm stage (R<) and a trip stage (R<<), with independently adjustable time delays.
- Digital Accuracy: Uses digital processing for high measuring accuracy.
- Fast Response: Extremely short response time for quick fault clearing.
- Robust Inputs: Short-circuit and overvoltage proof measuring inputs for reliability.
- Easy Setup & Use: Simple front-button settings, LED fault indication, integrated self-test, and sealable covers.
- Compact & Mountable: Compact design for easy DIN rail mounting.
- Wide Power Supply: Universal wide-range power supply for flexibility.
- System Integration: Supports data exchange with process management systems via an optional serial adapter (XRS1)
- Rotor Earth Fault Detection:
Detects insulation failures in the rotor’s DC field winding, preventing severe generator damage. - Two-Stage Protection:
Provides separate alarm (warning) and trip (shutdown) stages, enabling early intervention before a critical fault occurs. - High & Low Impedance Fault Detection:
Capable of identifying both major (low-impedance) and minor (high-impedance) earth faults for comprehensive protection. - Application in Synchronous Machines:
Designed for use in synchronous generators and motors, where rotor earth faults pose operational risks.
| Power supply: | 19 to 270 VAC / 19 to 360 VDC |
| Ambient temperature | |
| Storage: Operation: | `-20 °C to 70 °C `-10 °C to 55 °C |
| Voltage AC input: | 100 VAC and 400 VAC, 0 to 2 x Un |
| Current AC input: | 1 A or 5 A |
| Discrete inputs (isolated): | 19 to 270 VAC / 19 to 360 VDC |
| Relay outputs: | 250 VAC 6 A, 250 VDC 0.3 A, 24 VDC 6 A |
| Housing: DIN-Rail mount | |
| Dimension (W×H×D): | 75 × 255 × 110 mm |
| Sealing: | IP40 |
| Weight: | approx. 1,800 g |
