Basler Electric SR4A‑2B01B3A Static Voltage Regulator

The Basler Electric SR4A‑2B01B3A is a high‑performance static voltage regulator designed for synchronous generators of medium to large capacity. It provides automatic voltage regulation by controlling the exciter field current based on sensed generator terminal voltage. The regulator offers excellent steady‑state accuracy (±0.5%), fast transient response (<40 ms), and a wide range of adjustable settings to suit various generator and system requirements.

Control and Adjustment

The SR4A‑2B01B3A features a PID (Proportional‑Integral‑Derivative) control loop with adjustable gain, stability, and droop settings. Droop control (0‑5%) enables reactive load sharing in parallel operation. Under‑frequency roll‑off protection reduces excitation during speed dips. A voltage setpoint adjustment (90‑110% of nominal) and a stability pot are accessible from the front panel. An external trim input allows remote voltage adjustment.

Excitation Output

Output voltage: 0‑150 VDC, with continuous current up to 10 A (peak up to 20 A). The regulator can drive brushless exciters as well as DC exciters. It includes a current limiter and a field over‑excitation protection. Output ripple is less than 3% at full load. A field current monitor output is provided for metering.

Protection Features

Comprehensive protections include loss of sensing (shuts down excitation), over‑excitation limit, under‑excitation limit, thermal shutdown, and short‑circuit protection on the field output. An alarm output contact signals any fault condition. The regulator also has a built‑in self‑test function for diagnostic purposes.

Technical Specifications

Sensing input: 100‑480 VAC, 50/60 Hz, three‑phase or single‑phase. Power supply: derived from sensing. Accuracy: ±0.5%. Response time:<40 ms for 20% step change. Operating temperature: –25°C to +65°C. Enclosure: metal, IP20, panel‑mount.

Applications

This regulator is suitable for diesel, gas, and hydro generator sets from 200 kVA to over 2 MVA. It is used in prime power plants, standby systems, marine vessels, and renewable energy applications where reliable voltage control is critical.

Installation and Commissioning

Mount the regulator in a clean control panel. Connect sensing leads, field output, and auxiliary inputs. Commissioning involves setting the voltage setpoint, stability, and droop while performing load tests. The regulator includes a test mode for excitation checkout without running the generator.

Reliability and Standards

The SR4A‑2B01B3A meets IEEE C37.90 and IEC 61000 standards. It is built with industrial‑grade components and conformal coating for harsh environments. Basler Electric’s quality assurance ensures long‑term dependable operation.

Conclusion

The Basler Electric SR4A‑2B01B3A static voltage regulator is a versatile and robust solution for generator excitation control, offering precision, flexibility, and reliability for critical power generation.