Basler DECS-100-B11 Digital Automatic Voltage Regulator

The Basler DECS-100-B11 is a compact digital automatic voltage regulator (AVR) designed for synchronous generators in industrial, marine, and commercial power applications. This regulator provides precise excitation control to maintain stable generator output voltage under varying load conditions, ensuring reliable power quality for sensitive equipment. The DECS-100-B11 is part of Basler's trusted DECS series, known for robust performance and advanced protection features.

The regulator features a microcontroller‑based design with high‑speed processing and advanced PID control algorithms, delivering fast transient response and excellent steady‑state accuracy. It includes comprehensive protection functions such as over‑excitation limiting, under‑excitation limiting, V/Hz protection, and loss‑of‑sensing detection. The DECS-100-B11 offers a user‑friendly interface with LED indicators for status monitoring and potentiometers for adjustable settings, making it suitable for both new installations and retrofits of existing generator systems.

Technical Specifications

• Model: DECS-100-B11

• Control mode: AVR (automatic voltage regulation)

• Voltage sensing: 3‑phase, 0‑600 V AC (PT or direct connection)

• Field output: Up to 15 A continuous (adjustable)

• Regulation accuracy: ±0.5% of setpoint

• Protection: Over‑excitation, under‑excitation, V/Hz, loss of sensing

• Adjustments: Voltage setpoint, gain, stability, droop

• Power supply: 56‑277 V AC or 125 V DC

• LED indicators: Power, excitation ON, fault

• Operating temperature: -40°C to +70°C

• Dimensions: 150 x 120 x 60 mm

• Certifications: CE, UL, RoHS

Functional Capabilities

• Precise voltage regulation: Maintains generator terminal voltage within ±0.5% of setpoint under steady‑state and transient conditions.

• Over‑excitation limiter (OEL): Prevents rotor overheating by limiting the maximum field current.

• Under‑excitation limiter (UEL): Prevents loss of synchronism by maintaining minimum field current.

• V/Hz protection: Protects the generator and connected transformers from overfluxing during underfrequency conditions.

• Soft start: Controlled voltage build‑up during generator startup to minimize mechanical and electrical stress.

• Droop compensation: Adjustable reactive power droop for stable load sharing in parallel operation.

• Voltage matching: Supports automatic matching of generator voltage to bus voltage for smooth paralleling.

Typical Applications

• Diesel and gas gensets: Voltage regulation for standby and prime power systems.

• Marine generators: Shipboard power systems in commercial and naval vessels.

• Hydroelectric turbines: Excitation control for small to medium hydro plants.

• Industrial cogeneration: Voltage and reactive power control for plant power systems.

Installation and Configuration

Mount the DECS-100-B11 on a panel using the provided brackets. Connect the 3‑phase voltage sensing inputs to the generator potential transformers (PTs) or directly to the generator terminals if within the sensing range. Connect the field output to the exciter field winding through a suitable circuit breaker or fuse. The power supply can be connected to AC or DC sources as per the configuration. Commissioning involves setting the generator rated parameters, adjusting the AVR gain and stability controls, and verifying protection functions. The front‑panel LED indicators provide immediate status feedback for power, excitation, and fault conditions.

Compliance and Environmental

The DECS-100-B11 complies with IEEE 421.5 for excitation systems, IEC 60034‑16 for generator protection, and relevant EMC standards (EN 61000‑6‑2 and EN 61000‑6‑4). It carries CE and UL marks and is RoHS compliant. The regulator is designed for operation in pollution degree 2 environments and is rated for shock and vibration per IEC 60068‑2‑6 and IEC 60068‑2‑27.

Conclusion

The Basler DECS-100-B11 is a reliable, high‑performance automatic voltage regulator that delivers precise excitation control, advanced protection, and flexible configuration for a wide range of generator applications. Its compact design and robust construction make it an ideal choice for industrial power systems requiring stable and secure voltage regulation.