Basler SR4A2B05B3E Static Voltage Regulator

The Basler SR4A2B05B3E is a static voltage regulator (SVR) designed for brushless synchronous generators requiring accurate and responsive excitation control. This model is part of the SR4A series, known for its robust construction and versatile adjustment capabilities. It provides stable generator terminal voltage under varying load conditions and is suitable for both isolated and parallel operation.

Key Features

The regulator offers adjustable voltage setpoint, stability compensation, and reactive droop for parallel operation. It includes over‑excitation protection, under‑excitation limiting, and a soft‑start function to prevent voltage overshoot. The front panel is equipped with status LEDs and test points for easy commissioning and diagnostics.

Technical Specifications

Sensing input voltage: 110‑480 VAC, 50/60 Hz. Auxiliary power: 120‑240 VAC. Output voltage: up to 150 VDC for the exciter field. Continuous current rating: 5 A, peak 10 A. Regulation accuracy: ±0.5%. Response time:<30 ms. Operating temperature: -40°C to +70°C. Enclosure: panel‑mount with IP20 protection.

Operating Principles

The regulator compares the sensed generator terminal voltage with a user‑adjustable reference. The error signal drives a PID controller that modulates the firing angle of the SCR bridge, controlling the exciter field current. The droop function adjusts the voltage setpoint based on reactive current, ensuring stable reactive power sharing in parallel systems.

Applications

This regulator is used in standby generators, prime power systems, and marine installations. It is suitable for a wide range of generator sizes, from small industrial sets to larger utility‑type generators.

Installation and Configuration

Mount the regulator on a panel in a clean, dry location. Connect sensing and power inputs as well as exciter field leads. Configure the voltage setpoint, stability, and droop using the front‑panel trimpots. A systematic commissioning process, including a step‑load test, is recommended to optimize performance.

Maintenance and Reliability

The solid‑state design ensures high reliability with no wear‑prone parts. Routine maintenance consists of visual inspection and cleaning of the unit. The regulator includes built‑in protection circuits to safeguard against external faults.

Conclusion

The Basler SR4A2B05B3E static voltage regulator delivers consistent and precise voltage control, backed by Basler Electric's reputation for quality and durability in excitation systems.