Basler Electric SR8A2B06B3A Static Voltage Regulator

The Basler Electric SR8A2B06B3A is a static voltage regulator designed for brushless or DC excited synchronous generators with outputs up to several megavolt‑amperes. It continuously senses the generator terminal voltage and adjusts the excitation current to maintain the setpoint within ±0.5% under steady‑state conditions. The regulator is widely used in prime power, standby, and parallel‑operation systems, offering fast transient response and excellent stability.

Control and Adjustment

The SR8A2B06B3A employs a proportional‑integral (PI) control loop with adjustable gain and stability settings to match the generator and exciter time constants. It includes a droop control for parallel operation with other generators, allowing load sharing by adjusting the voltage setpoint inversely with reactive current. An under‑frequency roll‑off reduces excitation during low‑speed conditions to protect the generator from over‑excitation.

Front‑panel potentiometers provide easy access to set the voltage setpoint, stability, and droop. A built‑in voltmeter and ammeter (optional) simplify monitoring. The regulator also features a manual/auto selector switch for override control during commissioning.

Technical Specifications

Sensing input: 100‑480 VAC, 50/60 Hz, three‑phase or single‑phase. Excitation output: up to 100 VDC, 10 A continuous (depending on configuration). Regulation accuracy: ±0.5% of setpoint. Response time: less than 50 ms for 20% step change. Operating temperature: –20°C to +60°C. The regulator is housed in a NEMA 1 enclosure suitable for panel mounting.

Protection Features

The SR8A2B06B3A includes comprehensive protection: over‑excitation limit, under‑excitation limit, loss of sensing protection (which forces the regulator to a safe low output), and thermal shutdown. These safeguards prevent damage to the generator and the regulator itself during abnormal conditions. A trip output is provided for remote alarm or breaker tripping.

Applications

This regulator is suitable for diesel and gas generator sets, hydroelectric plants, and marine power systems. It is also used in cogeneration and microgrid installations where fast voltage recovery is essential. The SR8A2B06B3A can be retrofitted into existing switchgear with minimal wiring changes.

Installation and Commissioning

Mount the regulator in a clean, dry location near the generator control panel. Connect the sensing leads to the generator output, and the field leads to the exciter. Commissioning involves adjusting the voltage setpoint, stability, and droop while monitoring the generator voltage. A test mode allows checking the excitation output without running the generator.

Reliability and Maintenance

Built with industrial‑grade components and conformal‑coated circuit boards, the SR8A2B06B3A withstands humidity, vibration, and temperature extremes. Regular maintenance consists of visual inspection and cleaning of ventilation openings. The regulator’s solid‑state design ensures long‑term reliability with minimal downtime.

Conclusion

The Basler Electric SR8A2B06B3A static voltage regulator offers precise, stable, and reliable voltage control for a wide range of generator applications. Its robust construction and flexible settings make it a trusted choice for power generation professionals.