Basler Electric SR4A‑2B15B3A Static Voltage Regulator

The Basler Electric SR4A‑2B15B3A is a robust static voltage regulator designed for medium to large synchronous generators with excitation requirements up to 15 A. It provides automatic voltage regulation with an accuracy of ±0.5% and a transient response time of less than 50 ms. The regulator is suitable for standby, prime power, and parallel operation in utility, industrial, and marine environments.

Control and Adjustment

The regulator features a proportional‑integral (PI) control with adjustable gain and stability. Droop control (0‑5%) enables reactive load sharing. Voltage setpoint is adjustable from 90‑110% of nominal via front‑panel potentiometer. An under‑frequency roll‑off reduces excitation during speed dips. A remote voltage trim input is provided for external control.

Excitation Output

Output voltage: 0‑150 VDC, continuous current up to 15 A. The output is short‑circuit protected and current‑limited. The regulator includes a field over‑excitation protection and a soft‑start function to prevent voltage overshoot. A field current monitor output is available for metering.

Protection and Monitoring

Built‑in protections include loss of sensing, over‑voltage clamping, thermal shutdown, and reverse polarity protection. A fault relay output provides remote alarm. LED indicators show power, regulation status, and fault conditions. A self‑test feature is included for diagnostics.

Technical Specifications

Sensing input: 100‑480 VAC, 50/60 Hz. Accuracy: ±0.5%. Response time:<50 ms. Operating temperature: –25°C to +65°C. Enclosure: IP20, panel‑mount. Weight: approximately 3 kg. Complies with IEC 61000‑4‑2 for ESD.

Applications

This regulator is used on diesel, gas, and hydro generators from 300 kVA to 3 MVA. It is suitable for industrial plants, cogeneration, and offshore installations. It can be used with brushless or DC exciters.

Installation and Commissioning

Install in a standard control panel. Connect sensing leads, field leads, and auxiliary signals. Commissioning involves adjusting setpoint, stability, and droop while observing generator response under load. A manual test mode is available.

Reliability and Quality

Basler Electric’s SR4A‑2B15B3A is manufactured with high‑quality components and undergoes rigorous testing. Its solid‑state design ensures long life with minimal maintenance.

Conclusion

The Basler Electric SR4A‑2B15B3A static voltage regulator delivers reliable, accurate, and cost‑effective voltage control for a broad range of generator applications, making it a trusted choice for engineers and operators.