Basler Electric BE3-25A

Product Brief Introduction

Solid-state microprocessor-controlled generator voltage regulator dedicated for brushless synchronous alternators, stabilizes generator terminal voltage under variable load conditions, integrates overvoltage, undervoltage and overexcitation protection logic.
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Description

Technical Specifications

  1. Continuous Excitation Output Current: 25 Amp DC
  2. Regulation Accuracy: ±0.2% nominal generator terminal voltage
  3. Sensing Voltage Input Range: 90–600 VAC single/three-phase generator terminal sensing
  4. Auxiliary Power Supply: 120/240 VAC dual universal input
  5. Underfrequency Roll-off Point: Adjustable 45–65 Hz
  6. Response Time: <20ms voltage correction dynamic response
  7. Operating Ambient Temperature: -20°C to +60°C
  8. Control Adjustment Knobs: Voltage, Droop, U/F Slope, Gain manual potentiometers
  9. Parallel Operation Function: Built-in reactive power droop compensation for multi-generator paralleling

Functional Features

  • Closed-loop PID voltage regulation algorithm for fast load fluctuation compensation
  • Automatic underfrequency protection to prevent generator stall damage
  • Adjustable cross-current compensation for parallel genset load sharing
  • Overexcitation current limiting to protect generator rotor windings
  • Manual voltage trim potentiometer on front panel for field calibration
  • Analog fault alarm relay output for remote monitoring

Structural Characteristics

  • Compact panel-mount metal chassis with front control access
  • Screw terminal blocks for power, sensing, excitation and alarm wiring
  • Front transparent dust cover protecting adjustment potentiometers
  • Integrated heat sink for power semiconductor cooling

Material Composition

  • Outer casing: Cold-rolled steel sheet with anti-corrosion powder coating
  • Power heat sink: Aluminum alloy extrusion
  • Control PCB: FR4 high temperature flame retardant circuit board
  • Conductive terminals: Tin-plated copper alloy

Working Principle

Real-time sample generator terminal AC voltage via sensing input circuit; compare sampled voltage against internal preset reference value; microprocessor calculates PID correction signal; drive power thyristor module to adjust DC excitation current supplied to generator rotor; dynamically adjust excitation current to maintain stable terminal voltage during load rise/drop; trigger protective interlock and alarm relay when voltage/frequency/excitation exceeds threshold limits.

Advantage Highlights

  • High precision voltage regulation suitable for precision power load equipment
  • Native parallel genset reactive load sharing without external auxiliary modules
  • Wide universal AC sensing input compatible with all medium-small synchronous generators
  • Fully analog-digital hybrid control system stable under severe grid distortion
  • Front-panel calibration accessible without cabinet disassembly

Applicable Industries

Standby diesel generator sets, marine auxiliary power generators, construction mobile power units, industrial co-generation systems, hospital backup power plants, data center emergency gensets

Installation Requirements

  1. Install on vertical metal panel inside generator control cabinet with minimum 30mm rear ventilation gap
  2. Route high-current excitation wiring separate from low-voltage sensing signal cables
  3. Connect alarm relay contacts to central genset monitoring PLC input terminals
  4. Secure all terminal screws with specified torque 1.2 N·m to avoid loose connection arcing
  5. Bond regulator chassis to cabinet protective ground busbar

Usage Precautions

  • Do not operate unit at ambient temperature exceeding +60°C without forced cabinet ventilation
  • Isolate sensing signal cables with shielded twisted pair to eliminate voltage measurement distortion
  • Calibrate droop setting only during no-load generator commissioning
  • Disconnect auxiliary AC power before adjusting internal potentiometers
  • Prevent conductive dust accumulation on internal heat sink surfaces
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