DECS-250N, Digital Excitation Control System with Negative Forcing

The DECS-250N is a complete digital excitation control system. Total control in a compact package means precise voltage, var and power factor regulation, negative field-forcing capabilities, and exceptional system response, plus generator and motor protection. An optional Power System Stabilizer helps users meet stringent grid code compliance requirements. The DECS-250N offers extreme flexibility in a cost-effective, easy-to-use package.


  • Reduce setup time with Basler's intuitive BESTCOMSPlus® software that simplifies complex setup with simple drag-and-drop programmable logic, visual real-time strip chart capabilities, and cutting edge auto PID selection capabilities.
  • The revolutionary auto tuning function automatically establishes optimum PID and gain settings, taking the guesswork out of system setup, reducing commissioning time and cost, while maximizing overall system performance.
  • Network Load Sharing provides easy implementation in complex paralleled systems.
  • The Offline Simulator in BESTlogic™Plus helps identify and troubleshoot logic without the need for expensive physical hardware.
  • A powerful 20 amp rectifier bridge provides high positive and negative field forcing for exceptional system response. The negative field-forcing capabilities make it well suited to be paired with the optional Power System Stabilizer.
  • The DECS-250N's rms sensing and rugged power stage create an easy, worry-free solution for applications containing high waveform distortion caused by nonlinear loading.
  • The advanced microprocessor-based design provides visionary expandability, flexibility, and reliable operation for any system.
  • The optional integrated power system stabilizer eases concerns about grid code compliance issues with its advanced power system performance and reliability, eliminating the need of external devices and wiring.
  • The DECS-250N contains a full suite of generator and motor protection for accurate fault detection and clearing, eliminating dangerous and damaging conditions to the generator or motor.
  • Multilingual user interface simplifies setting the DECS-250N and helps to eliminate potential setup errors.
  • Contains extensive communication options to allow for easy integration into a wide variety of control systems.


Technical Resources


Case Studies

  • Case Study

    • One Good DECS Deserves Another (616.8KB)
      Throughout Taiwan’s history, many government-owned power plants were built to supply power for the main island of Taiwan and its outlying islands. Basler excitation systems and protective relays are widely used in these plants.
    • One of Basler’s First SSE’s Still Carrying the Load of a 2MW Generator (1.8MB)
      From the early days of rotating exciters to today’s digital static excitation systems using power semiconductors, Basler’s generator excitation systems have made great strides in innovation and efficiency while always maintaining their reputation for legendary reliability.