Basler SR125-E Static Voltage Regulator – High-Performance AVR for Brushless Generators

The Basler SR125-E (9125600106) is a state-of-the-art static voltage regulator specifically developed for brushless synchronous generators. With its advanced control algorithm, it delivers outstanding voltage regulation under steady-state and transient conditions, ensuring reliable power quality for sensitive loads.

Advanced Regulation Features

The SR125-E employs a dual-loop control strategy: an inner current loop for fast field control and an outer voltage loop for precise terminal voltage regulation. This results in a response time of less than 15 ms for a 20% load step, with settling to within 0.5% of setpoint in under 100 ms.

Technical Specifications

• Sensing input: 120–277 VAC, 50/60 Hz

• Output current: 6 A continuous, 12 A forcing

• Voltage regulation accuracy: ±0.5%

• Adjustable droop: 0–15%

• Built-in EMI filter for industrial environments

• Wide operating temperature: -40°C to +75°C

Protection and Diagnostics

The regulator includes over-excitation protection, under-voltage sensing, and a thermal cut-off switch. A multi-color LED indicates status: green for normal, yellow for warning, and red for fault. A dry contact relay provides alarm output to a remote monitoring system.

Installation and Commissioning

The SR125-E is designed for easy retrofitting into existing panels. Its terminal layout matches many legacy AVRs, reducing rewiring time. The setup procedure involves selecting the sensing voltage, setting the voltage setpoint, and tuning the stability and gain for optimal performance. The included manual provides oscilloscope-based tuning guidance.

Parallel Operation

For multi-generator systems, the SR125-E supports reactive droop compensation and can be interfaced with a cross-current compensation board. This ensures stable reactive load sharing among paralleled sets.

Applications

This regulator is widely used in hospital emergency generators, data center backup sets, and remote mining site generators. Its robust design and high performance make it suitable for both prime power and standby applications.

Maintenance

Routine maintenance is limited to visual inspection and terminal torque checks. The unit is fully encapsulated for protection against moisture and vibration, ensuring a long service life.

Conclusion

The Basler SR125-E Static Voltage Regulator sets a new standard for brushless generator excitation, combining advanced control, robust protection, and user-friendly installation.