Basler DECS-100-B15 Digital AVR – Advanced Generator Excitation Control

The Basler DECS-100-B15 is a member of the DECS-100 family of digital automatic voltage regulators, specifically configured with the B15 hardware option. It provides comprehensive excitation control for synchronous generators, combining high-speed processing with flexible field adjustment to meet the demands of modern power systems.

Digital Control Architecture

Using a 32-bit microcontroller, the DECS-100-B15 performs continuous real-time calculations of generator voltage, current, power factor, and frequency. The digital control loop allows for precise tuning with no drift over temperature or time, and supports multiple setting groups that can be switched via external contacts.

Key Features

• Voltage regulation accuracy: ±0.25% of setpoint

• Response time: < 10 ms for 95% transient recovery

• Field current output: 15 A continuous, 30 A forcing

• Built-in power system stabilizer (PSS) for damping oscillations

• Modbus RTU and optional Ethernet communication

• Event logging with up to 500 records

Protection Functions

The regulator includes over-excitation limit (OEL), under-excitation limit (UEL), voltage-dependent reactive current limit, and field over-temperature protection. It also features a loss-of-sensing detection that automatically transfers to manual mode.

Setup and Configuration

Configuration is performed via a front-panel keypad and LCD display, or through the BESTCOMS software. Parameters include voltage setpoint, stability gains, droop percentage, and various protective thresholds. The B15 variant includes additional analog inputs for remote setpoint trimming.

Installation

The DECS-100-B15 is designed for panel mounting with a standard 19-inch rack adapter or flush mount. It operates on a wide auxiliary supply (24–250 VDC or 100–240 VAC) and includes isolated inputs for voltage and current sensing.

Applications

This AVR is suitable for utility-scale generators, industrial turbines, and marine propulsion generators. Its digital flexibility allows it to adapt to different grid codes and operational requirements.

Maintenance and Diagnostics

Self-diagnostics are performed at power-up and continuously. Any internal faults are reported on the LCD and via communication. Routine maintenance involves periodic verification of voltage and current measurements.

Compliance

The DECS-100-B15 complies with IEEE 421.5, IEC 60068, and relevant EMC standards, ensuring reliable operation in harsh electrical environments.

Conclusion

The Basler DECS-100-B15 Digital AVR delivers state-of-the-art performance, flexibility, and protection for critical generator applications.