BASLER DECS-200N-C1

Model Series Definition

• DECS: Digital Excitation Control System digital excitation controller series
• 200N: Negative Forcing bidirectional excitation topology hardware platform
• C1: Single non-redundant control channel standard configuration

Technical & Performance Parameters

1. Bidirectional Excitation Output Specs
   • Positive Excitation Output Voltage: 63 VDC / 125 VDC configurable
   • Negative Forcing Demagnetization Output Voltage: Matches positive rated voltage range
   • Continuous Positive Excitation Current: 20 ADC
   • Peak Negative Forcing Demagnetization Current: 25 ADC (5-second maximum duration)
2. Power Sensing & Control Input
   • Voltage Sensing Range: 120–600 VAC multi-range auto-adaptive
   • Auxiliary Control Power: 100–277 VAC single-phase 50–160 Hz, 50 VA rated
3. Regulation & Transient Specs
   • Steady-State Voltage Regulation Accuracy: ±0.25% ISO 8528-5
   • Voltage Recovery Time after Grid Short-Circuit Fault: < 100 ms via negative forcing demagnetization
4. Protection & Data Logging
   • Full suite generator protection including negative field current over-limit protection
   • 127 SER fault event records, 8 transient oscillography waveform storage

Material Composition

• Reinforced steel cabinet with enhanced power heat dissipation frame
• Six-thyristor bidirectional full-wave rectifier power bridge assembly for positive/negative excitation current
• Dual-side aluminum heat sinks for positive and negative power switching devices
• Anti-transient surge protection circuit integrated on sensing signal PCB

Structural Features

• Standard rack-mount housing compatible with DECS-200 series cabinet installation dimensions
• Front panel LCD display with dedicated negative forcing current real-time readout window
• Rear terminal block with independent positive/negative excitation output terminals, separate voltage sensing and auxiliary power terminals

Working Principle

Core Function Features

1. Bidirectional positive boost / negative demagnetization excitation current output for ultra-fast voltage transient recovery
2. Dedicated negative field current over-limit protection preventing rotor winding reverse current damage
3. Native PSS power system stabilizer interface for grid-connected generator low-frequency oscillation suppression
4. Local front panel and BESTCOMS™ PC software dual parameter configuration modes
5. Grid parallel reactive droop compensation and U/F over-excitation protection
6. Real-time negative forcing current monitoring and fault alarm output relay contacts

   Advantage Highlights

   1. Negative forcing demagnetization topology achieves sub-100 ms generator voltage recovery after grid short-circuit faults
   2. 20 ADC continuous positive excitation current improves generator overload transient response capacity
   3. Independent negative current limiting hardware protection eliminates rotor winding reverse current thermal damage risk
   4. Unified mechanical dimensions with standard DECS-200 series, compatible with existing cabinet mounting brackets without structural modification
   5. Optimized thyristor heat sink layout extends power stage service life under frequent bidirectional current switching working conditions

   Applicable Industries

   Grid-connected synchronous power generators, combined cycle gas turbine power units, wind-hydro hybrid power stations, large industrial self-generation power plants, utility distributed power generation equipment requiring fast voltage dynamic response

   Installation Requirements

   1. Standard 19-inch single-unit rack mounting, maintain ≥120 mm rear ventilation gap for dual-side aluminum heat sinks
   2. Excitation output wiring must use twisted shielded high-temperature copper cables with minimum cross-section 6 mm² to withstand bidirectional peak current
   3. Auxiliary control power supply shall be isolated from generator main power circuit via independent isolation transformer
   4. Voltage sensing signal cables must be physically separated from high-current excitation output wiring with minimum 15 cm spacing
   5. Ambient continuous operating temperature above 50°C requires cabinet forced air cooling system with air flow rate ≥80 CFM

   Operation & Maintenance Precautions

   1. Do not disable negative forcing current limit parameter to avoid irreversible insulation breakdown of generator rotor excitation winding
   2. Conduct heat sink dust cleaning every 4 months for units operating in dusty power plant environments
   3. Complete bidirectional excitation current calibration via BESTCOMS™ software every 24 months to guarantee regulation precision
   4. Avoid long-term continuous negative forcing operation exceeding 5-second rated peak demagnetization duration to prevent thyristor overheating lockout
   5. Inspect terminal wiring tightness every 6 months; loose excitation terminals will generate high temperature under bidirectional alternating current load