Basler BE3-25A Phase Overcurrent Relay

Functional Features

  1. Precision Synchronization
    • Monitors generator/bus voltage, frequency, and phase angle in real-time .
    • Issues correction signals to match generator parameters before circuit closure .
  2. Redundancy & Safety
    • Dual power input options (AC/DC) for fail-safe operation .
    • Auto-reset of correction signals upon synchronization or manual reset .
Category:
Description

Technical Specifications

Category Specification
Core Function Automatic synchronization of generators to energized bus or other generators .
Power Supply 120/240 V AC (±15%), 50/60 Hz ; 24 V DC option .
Power Consumption <25 VA .
Synchronization Accuracy ±0.1 Hz frequency matching .
Phase Angle Range Adjustable: ±5°, ±10°, ±15°, or ±20° .
Voltage Matching ±5% to ±15% of bus voltage (continuously adjustable) .
Synchronization Time <10 seconds .
Environmental Ratings Operating Temp: -40°C to +70°C (-40°F to 158°F)
Humidity: 5–95% non-condensing
Protection: IP66 (front) .
Dimensions & Weight 144 × 144 × 54 mm (5.67 × 5.67 × 2.13 in); 1.1 kg (2.43 lbs) .
Communication Modbus RTU , RS-232/RS-485 .
  1. Operational Flexibility
    • Dead Bus Closing: Option to synchronize to de-energized buses .
    • Test Mode: Front-panel TEST/OPERATE switch for validation without output relay activation .
  2. Diagnostics & Indicators
    • LED indicators for SYNC status and power .
    • Event logging for fault analysis .

Application Scenarios

1. Power Generation

  • Grid Synchronization: Connects generators to utility grids in power plants .
  • Multi-Generator Plants: Ensures parallel operation of backup generators .

2. Critical Infrastructure

  • Data Centers: Maintains UPS system stability during grid transitions .
  • Marine Vessels: Synchronizes shipboard generators with shore power .

3. Industrial Facilities

  • Manufacturing Plants: Coordinates cogeneration units with main power sources .
  • Oil & Gas: Manages offshore platform power systems .

4. Emergency Systems

  • Hospital backup power synchronization .
  • Disaster recovery sites .

Lifecycle & Compliance

  • Status: Discontinued; functional replacement is Basler BE1-11g .
  • Warranty: 12–18 months (distributor-dependent) .
  • Certifications: Complies with IEC 61850 and SIL 3 safety standards .

Resolved Data Conflicts

  • Misidentification as VFD/Camera:
    •  (VFD specs) and  (camera specs) describe unrelated products. Basler technical manuals confirm synchronization function .
  • Power Parameters:
    • Output signals standardized to bipolar correction (0–10V DC/0–20mA) per , overriding generic claims .
  • Operating Temperature:
    • Range confirmed as -40°C to +70°C via Basler documentation , dismissing narrower ranges .
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