Basler Electric SR4A‑2B15B3E Static Voltage Regulator

The Basler Electric SR4A‑2B15B3E is a high‑performance static voltage regulator designed for synchronous generators requiring excitation currents up to 15 A. It provides precise regulation with an accuracy of ±0.5% and a fast transient response of less than 40 ms. The regulator is suitable for large diesel, gas, and hydro generators in utility, industrial, and marine applications, offering advanced control features and robust construction.

Control Algorithms

The regulator uses a digital PID control with adaptive gain to optimize response for varying load conditions. It includes a built‑in power system stabilizer (PSS) to damp low‑frequency oscillations. Voltage setpoint is adjustable from 90‑110% of nominal, and droop control (0‑5%) enables reactive load sharing in parallel operation. An under‑frequency roll‑off with adjustable knee frequency protects the generator during speed dips.

Excitation Output

Output voltage: 0‑150 VDC, continuous current up to 15 A (peak 25 A). The output is fully protected against short circuits and overcurrent. A field flashing circuit provides initial excitation build‑up. The regulator includes a current limiter and over‑excitation protection. A field current monitor output is provided for metering.

Protection and Diagnostics

Comprehensive protections include loss of sensing, over‑excitation limit, under‑excitation limit, thermal shutdown, and frequency protection. The unit has a front‑panel LCD display showing voltage, current, and fault codes. It includes RS‑485 communication for remote monitoring and integration with SCADA systems. A self‑test function is available for diagnostic purposes.

Technical Specifications

Sensing input: 100‑480 VAC, 50/60 Hz, three‑phase or single‑phase. Accuracy: ±0.5%. Response time:<40 ms. Operating temperature: –25°C to +65°C. Enclosure: IP20, panel‑mount. Compliance with IEEE 421.5 and CE standards.

Applications

This regulator is used on generators from 500 kVA to 5 MVA in prime power, standby, and parallel operation. It is ideal for data centers, hospitals, offshore platforms, and industrial cogeneration plants.

Installation and Commissioning

Mount the regulator in a ventilated panel. Connect sensing leads, field output, and auxiliary inputs. Commissioning involves setting parameters via the front panel or software, and performing step‑load tests to verify performance. The regulator includes a test mode for excitation checkout.

Reliability and Quality

Basler Electric’s rigorous testing ensures high reliability. The SR4A‑2B15B3E is built with premium components and designed for long‑term continuous operation. It is backed by Basler’s technical support and warranty.

Conclusion

The Basler Electric SR4A‑2B15B3E static voltage regulator combines advanced control, robust construction, and comprehensive protection, making it a superior choice for high‑power generator voltage regulation.