Basler SR4A2B10B1A Static Voltage Regulator

The Basler SR4A2B10B1A is a static voltage regulator from the widely used SR4A series, designed for brushless synchronous generators. It offers precise voltage regulation with flexible adjustment capabilities, making it suitable for both isolated and parallel generator operations. This regulator is built to maintain stable terminal voltage under diverse load conditions, ensuring high-quality power output.

Key Features

The regulator provides adjustable voltage setpoint, stability compensation, and reactive droop for parallel sharing. It includes over-excitation protection, under-excitation limiting, and a soft-start function to reduce voltage overshoot. The front panel features status LEDs and test points for convenient commissioning and troubleshooting.

Technical Specifications

Sensing input voltage is 110 to 480 VAC at 50/60 Hz. Power supply input is 120 to 240 VAC. Output voltage can reach up to 150 VDC for the exciter field, with a continuous current rating of 10 A and a peak of 15 A. Regulation accuracy is ±0.5%, and response time is less than 30 milliseconds. Operating temperature range is -40°C to +70°C. The unit is housed in a rugged panel-mount enclosure with IP20 protection.

Operating Principles

The SR4A2B10B1A compares the sensed generator terminal voltage with a user-adjustable reference. The error signal drives a PID controller that modulates the firing angle of the SCR bridge, controlling the exciter field current. Droop compensation adjusts the voltage setpoint based on reactive current to ensure stable reactive power sharing in parallel systems.

Applications

This regulator is used in standby generators, prime power systems, and marine applications. It is suitable for a wide range of generator sizes, from small industrial sets to larger utility-type generators, due to its robust output capability.

Installation and Configuration

Mount the regulator on a panel in a clean, dry location. Connect the sensing inputs, auxiliary power, and exciter field leads. Configure the voltage setpoint, stability, and droop using the front-panel trimpots. A step-load test is recommended to verify regulation performance and optimize the stability setting.

Maintenance and Reliability

The solid-state design ensures high reliability with minimal maintenance. Routine inspection includes cleaning and checking terminal tightness. Built-in protection circuits safeguard against short circuits and overvoltage.

Conclusion

The Basler SR4A2B10B1A static voltage regulator delivers consistent and precise voltage control, backed by Basler Electric's proven reputation in excitation systems.