Basler SCP 250‑G‑60 VAR / Power Factor Controller

The Basler SCP 250‑G‑60 is a solid‑state VAR/power factor controller designed for automatic reactive power control in generator sets and distribution systems. Identified by part number 9 1100 00 109, this controller regulates the excitation to maintain a preset power factor or VAR output, improving system efficiency and voltage stability. It is an essential component for parallel operation and grid‑connected generators.

Key Features

The controller features adjustable power factor or VAR setpoints, with independent time delays and response settings. It includes high‑accuracy measurement of voltage, current, and power factor. The unit provides output signals to the AVR for excitation adjustment. It includes LED status indicators and test points for commissioning. The controller is housed in a rugged enclosure suitable for panel mounting.

Technical Specifications

Input voltage: 120 or 240 VAC, 50/60 Hz. CT secondary: 5 A or 1 A. Power factor setpoint range: 0.7 leading to 0.7 lagging. VAR setpoint range: adjustable. Response time: less than 100 ms. Output: analog or pulse signals to AVR. Operating temperature: -20°C to +60°C. Auxiliary supply: 120/240 VAC. The unit is designed for continuous duty.

Operating Principles

The controller continuously measures the system voltage, current, and phase angle to calculate real and reactive power. It compares the measured power factor or VAR against the setpoint. Any deviation generates a correction signal that is sent to the AVR to adjust the excitation, thereby changing the reactive power output to match the desired setpoint.

Applications

This controller is used in generator sets operating in parallel with the utility grid or other generators. It is also applied in industrial plants to maintain power factor within utility requirements, avoiding penalties and improving system efficiency.

Installation and Configuration

Mount the controller on a panel. Connect voltage and current inputs, auxiliary power, and output signals to the AVR. Adjust the setpoint, response speed, and time delays using front‑panel controls. Commissioning with load testing is recommended to verify stable control.

Maintenance and Reliability

Solid‑state design ensures reliability. Periodic inspection of connections and verification of setpoints is recommended. The controller includes protection against transient overvoltages.

Conclusion

The Basler SCP 250‑G‑60 VAR/power factor controller provides reliable and automatic reactive power control, ensuring optimal power factor and system efficiency.