Basler Electric has introduced the DECS-400 digital excitation Control system, a microprocessor-based controller designed to provide excitation control, flexible logic control and optional power system stabilization for synchro machines. The DECS-400 provides an analog output to control the DC output of the external rectifier bridge and monitors machine parameters to control, limit and protect the synchro from its capability limits. The DECS-400 digital excitation Control system is a microprocessor-based controller that provides synchronous machines with excitation control, flexible logic control and optional power system stabilization in an integrated package.

The system has several control modes, including automatic voltage regulation (AVR), field current regulation (FCR), power factor (PF) and reactive power control (VAR). The DECS-400 also offers 0.20% voltage regulation accuracy and has two preset set points for each mode. The system also features two programmable analog outputs that can be set via a front panel HMI or PC.

The DECS-400 also includes an optional power system stabilizer that complies with IEEE standard PSS2A, a dual-input, “accelerated power integral” stabilizer that provides supplemental damping for low-frequency local mode, interzone, and intercell power system oscillations. Setup and initial operation are facilitated by Basler Electric’s user-friendly BESTCOMS PC software, which integrates real-time monitoring test analysis, flexible oscilloscope, trend and extended test functions, including methods for performing frequency response tests and graphical display of results.

DECS 200-2C

DECS-400 has a wide range of applications, suitable for all kinds of large and medium-sized water turbine, gas turbine, gas or nuclear generating units of self-parallel excitation static excitation system, self-excitation or other excitation brushless excitation system, three-engine excitation system. The system configuration is flexible and can be combined according to different excitation power requirements.

The hardware composition of the DECS-400 includes support for a three-phase thyristor fully controlled rectifier bridge, a forced-air cooling and redundant fan design, multiple capacity options, and a maximum rated output of 3,000 ADC in a single bridge. It can be used with the Basler Electric Interface Trigger Module (IFM), half-controlled or fully controlled rectifier bridge, or with other compatible rectifier Bridges.

The system provides PC communication software with Windows interface (such as BESTCOMS, BESTWAVE, BESTLOAD), which makes the system debugging and maintenance more convenient and fast.

The DECS-400 digital excitation control system provides strong support in the field of power system automation with its high precision control, flexibility and reliability.