Product Short Description

Product Brief

DECS-200-2C is single-channel microprocessor-based digital excitation voltage regulator developed by Basler Electric for medium-small synchronous generators. It provides precision closed-loop terminal voltage regulation, integrated multi-level generator protection, reactive power control and sequence event recording functions, applicable to non-redundant single excitation channel generator sets.
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BASLER DECS-200-2C
BASLER DECS-200-2C - Image 2
BASLER DECS-200-2C - Image 3

Description

Model Series Definition

  • DECS: Digital Excitation Control System digital excitation controller series
  • 200: Second-generation universal excitation regulator hardware platform
  • 2C: Single non-redundant control channel, standard positive forcing excitation topology configuration

Technical & Performance Parameters

  1. Power Input Specs
    • Sensing Voltage Input: 120 / 240 / 480 / 600 VAC multi-range auto-adaptive
    • Auxiliary Control Power Input: 100–277 VAC single-phase 50–160 Hz, 40 VA rated
  2. Excitation Output Specs
    • Rated DC Excitation Output Voltage: 32 VDC / 63 VDC / 125 VDC software configurable
    • Continuous Excitation Output Current: 15 ADC steady-state, 30 ADC forced for 10 seconds
  3. Regulation Accuracy Specs
    • Steady-State Terminal Voltage Regulation Precision: ±0.25% (compliant with ISO 8528-5)
    • Reactive Power / Power Factor Control Adjustment Range: ±0.5 PF full range
  4. Data Recording Specs
    • Sequence of Event Recording (SER): 127 event fault records stored in volatile memory
    • Oscillography Waveform Storage: 8 transient waveform records, maximum 6 variable channels per record
  5. Environmental Specs
    • Operating Temperature: -10°C to +65°C
    • Protection Class: IP20 cabinet mounting

Material Composition

  • Chassis: Cold-rolled steel anti-rust coated cabinet
  • Power Rectifier Stage: Silicon thyristor controlled rectifier bridge assembly
  • Control PCB: Industrial grade multi-layer digital signal circuit board
  • Heat Dissipation: Extruded aluminum power heat sink with forced air cooling fan

Structural Features

  • Standard rack-mount metal housing for generator control cabinet installation
  • Front panel: LCD operation display, parameter navigation buttons, excitation running/alarm LED indicators
  • Rear terminal row: Voltage sensing input terminals, excitation power output terminals, auxiliary power supply, alarm relay contact terminals
  • Internal independent power stage and digital control board layered isolation layout

Working Principle

Three-phase generator terminal voltage sensing signals are transmitted to internal voltage sampling circuit; microprocessor compares sampled voltage value with user set reference voltage, calculates control deviation and outputs PWM drive signals to six-pulse thyristor rectifier bridge. Rectifier converts AC auxiliary power to adjustable DC excitation current supplied to generator rotor winding to realize terminal voltage closed-loop regulation. Built-in stator current limiting, field overcurrent, under-excitation and over-excitation protection logic monitors generator operating status and cuts excitation output upon fault threshold crossing.

Core Function Features

  1. Multi-mode control switching: Automatic Voltage Regulation (AVR), Reactive Power Control, Power Factor Control
  2. Stator high/low dual-stage current limiting protection with adjustable action delay timer
  3. U/F ratio over-excitation protection for generator low-frequency startup operation
  4. Built-in sequence event recorder and COMTRADE standard format transient oscillography storage
  5. Local front panel parameter configuration and PC BESTCOMS™ software remote parameter modification dual modes
  6. Parallel generator reactive power droop compensation function for multi-unit grid parallel operation

Advantage Highlights

  1. Single unit supports three excitation output voltage ranges (32/63/125 VDC) via software configuration without hardware replacement
  2. High regulation precision meets strict power grid grid-connected generator technical standards
  3. Integrated complete generator protection suite eliminating separate external protection relays
  4. Transient waveform recording function simplifies post-fault power system failure analysis

Applicable Industries

Diesel generator set control, small hydropower synchronous generator excitation, distributed photovoltaic backup generator, marine ship synchronous generator excitation, industrial standby power station

Installation Requirements

  1. Mount inside IP54 generator control cabinet, reserve ≥120 mm rear heat sink ventilation clearance
  2. Voltage sensing wiring must use shielded twisted pair cable, separate from high-current excitation output wiring
  3. Excitation output copper wire minimum cross-section 4 mm² for 15 A continuous rated current
  4. Cabinet forced cooling fan required for continuous full-load operation above 50°C ambient temperature

Operation & Maintenance Precautions

  1. Verify voltage sensing wiring phase sequence matching generator output terminals before power-on startup
  2. Clean aluminum heat sink dust accumulation every 6 months to avoid over-temperature excitation limiting
  3. Calibrate terminal voltage sensing channel every 24 months to maintain ±0.25% regulation accuracy
  4. Avoid parallel operation with generators without reactive droop parameter matching configuration

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