Basler SR4A‑2B15B3A Static Voltage Regulator

The Basler SR4A‑2B15B3A is a static voltage regulator designed for brushless synchronous generators. It controls the excitation current to maintain constant generator terminal voltage under varying load conditions. This model, identified as SR4A2B15B3A, is part of the SR4A series known for fast response, high reliability, and extensive protection features.

Key Features

The regulator offers adjustable voltage setpoint, droop compensation for paralleling, and stability adjustment to match generator dynamics. It includes over‑excitation protection, under‑excitation limiting, and a soft‑start function to reduce voltage overshoot during startup. Built‑in LED indicators display status and fault conditions.

Technical Specifications

Sensing input: 110‑480 VAC, 50/60 Hz. Power supply: 120‑240 VAC. Output voltage: up to 150 VDC for exciter field. Continuous output current: 5 A, peak 10 A. Voltage regulation accuracy: ±0.5%. Response time: less than 30 milliseconds. Operating temperature: ‑40°C to +70°C. Enclosure protection: IP20.

Operating Principles

The SR4A compares the sensed generator voltage with an internal reference. Any deviation generates an error signal that adjusts the firing angle of the SCR bridge, controlling the exciter field current. The regulator incorporates a PID control loop for stable performance. Droop compensation allows parallel operation by adjusting the voltage setpoint proportional to reactive power.

Applications

This regulator is used in standby generators, prime power sets, and marine generators. It is suitable for both isolated and grid‑parallel operation. The SR4A‑2B15B3A is commonly found in power plants, data centers, and offshore platforms.

Installation and Configuration

Mount the regulator in a clean, dry enclosure. Connect the sensing voltage, power input, and exciter field leads. Configure the setpoint, droop, and stability via front‑panel trimpots. A commissioning test with a load bank is recommended to verify regulation performance.

Maintenance and Reliability

With no moving parts, the SR4A requires minimal maintenance. Periodic inspection of connections and cooling fans (if fitted) ensures long life. The regulator is protected against short circuits and overvoltage, enhancing system reliability.

Conclusion

The Basler SR4A‑2B15B3A Static Voltage Regulator delivers high‑performance voltage control for demanding generator applications. Its robust design and comprehensive protection make it a trusted choice for generator OEMs and operators.