DECS-250, Digital Excitation Control System

The DECS-250 is a complete digital excitation control system. Total control in a compact package provides precise voltage, var and power factor regulation, and exceptional system response, plus generator and motor protection. An optional power system stabilizer helps you meet stringent grid code compliance requirements. The DECS-250 offers extreme flexibility and total functionality in a cost effective, easy-to-use package.

Benefits
Manuals
Bulletins
Technical Resources
Applications
Case Studies

Benefits

Reduce your 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 the logic without the expensive need for physical hardware.
Powerful 15 amp pulse-width-modulated (PWM) power stage provides a high initial response for exceptional system response to load transients. Flexible PWM power stage makes it easily adaptable to any system - shunt, auxiliary winding, permanent magnet, or dc fed.
The DECS-250's rms sensing and rugged power stage creates an easy, worry-free solution for applications containing high waveform distortion caused by non-linear loading.
The DECS-250's 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.
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-250 and helps to eliminate potential errors in setup.
Contains an extensive array of communication options which allows for easy integration into a wide variety of control systems.
Grid Code: Component certified per standard VDE-AR-N 4110.

Manuals

Bulletins

Product Bulletin
Brochure
- Brochure: Power Systems Solutions - Proven Worldwide, English (5.9MB)
  Solutions for Excitation Systems, Protection Systems/Relays, Voltage Regulators, and Genset/Engine Controllers.
- Brochure: Power Systems Solutions - Proven Worldwide, Japanese (6.4MB)
  Solutions for Excitation Systems, Protection Systems/Relays, Voltage Regulators, and Genset/Engine Controllers.

Technical Resources

Agency Certification
Application Guide
- Application Guide: How to Set Up Grid Code Compliance Features in the DECS-250 (1.1MB)
  This application guide provides information for implementing the Grid Code Compliance feature set of Basler’s DECS-250 Digital Excitation Control System.
Guideform Specification
- Guideform Specification: DECS-250 (DOC) (42.3KB)
- Guideform Specification: DECS-250 (PDF) (145.8KB)
Product Drawing
Technical Paper
- Technical Paper: Considerations for Effective RS-485 Network Design (385.1KB)
  Considerations for effective RS-485 network design.
- Technical Paper: Digital Excitation Systems—Growing Obsolescence of Aging Systems (752.1KB)
  The life expectancy of digital excitation systems is influenced by the availability of spare and replacement parts. Many factors affect the ability of manufacturers to continue producing these systems and providing replacement parts. Strategies exist for prolonging the life of existing digital equipment and minimizing the cost impact of complete replacement.
- Technical Paper: Feature Enhancements in New Digital Exctation System Speed Performance Testing (1.7MB)
  Technology built into the excitation system can ease the burden of performing required tests.
- Technical Paper: Voltage Regulator and Parallel Operation (1.5MB)
  Control of the voltage regulator when operating generators in parallel.
- Technical Paper: Voltage Regulator Autotuning Speeds Commissioning of the Generator Excitation System (931.7KB)
  PID tuning capabilities of a digital excitation system and a new feature called automatic tuning.
Textbook Order Form
- Textbook: Excitation Control Systems, Second Edition Order Form (180.2KB)
  This book offers the reader a thorough understanding of excitation control systems, including the synchronous generator, exciter and voltage regulator. It is now available through direct order, via the PDF form. If the PDF file does not open correctly, right-click on the link and select "Save Link As" to save the PDF file to your PC.

Applications

Application Guide
- Application Guide: How to Set Up Grid Code Compliance Features in the DECS-250 (1.1MB)
  This application guide provides information for implementing the Grid Code Compliance feature set of Basler’s DECS-250 Digital Excitation Control System.
Application Note
- Application Note: PC-OLS (529.8KB)
  Implement Any Logic Scheme Confidently with our Offline Logic Simulator.
- Application Note: RSC-D15REPLACE (1.1MB)
  Basler makes it easy to apply a DECS-250 as a replacement to a DECS-15.
- Application Note: RSC-D250AUTO (495.8KB)
  Automatic PID tuning of DECS-250.
- Application Note: RSC-D250AUTOSYNC (924.8KB)
  DECS-250 Setup Guide: Using the Automatic Synchronizer.
- Application Note: RSC-D250LDC (564.8KB)
  Using Line Drop Compensation
- Application Note: RSC-D250LIMITER (981.5KB)
  Utilizing the DECS-250 limiters to protect a generator when connected to a fluctuating bus.
- Application Note: RSC-D250PROFIBUS (1MB)
  An example of how to configure the DECS-250 as a PROFIBUS Slave module.
- Application Note: RSC-D250REPLACE (1.4MB)
  Basler makes it easy to apply a DECS-250 as a replacement to a DECS-200.
- Application Note: RSC-GRIDCODE (455.9KB)
  Evolution of Grid Code Compliance: Basler Innovation Leads the Way.
- Application Note: RSC-ICRM (373.9KB)
  Minimizing inrush current on PWM-type voltage regulators.
- Application Note: RSC-NLS (977KB)
  Comparison of Network Load Sharing and Cross Current Compensation
Product Selector
- AVR Selection Chart, English (165.1KB)
  Find a new or replacement Automatic Voltage Regulator (AVR) to fit your application.
- AVR Selection Chart, Chinese (279.6KB)
  Find a new or replacement Automatic Voltage Regulator (AVR) to fit your application.

Case Studies

Case Study
- Flour Plant in Tlalnepantla, Mexico Gets a DECS-250 Upgrade (835.9KB)
  Grupo Minsa is the second-largest corn flour producer in Mexico. The company makes four different types of corn flour for industrial, commercial, and home use.
- 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.