Basler Electric CBS 212 Current Boost System

The Basler Electric CBS 212 Current Boost System is an auxiliary device designed to temporarily increase the excitation output of a generator voltage regulator during short-circuit or severe overload conditions. By providing additional field current, the CBS 212 helps the generator maintain voltage support and deliver higher short-circuit currents, which is crucial for coordinated fault clearing in power systems. This system is especially valuable in islanded or weak-grid applications where short-circuit capacity is limited.

Key Features

• Independent current boost module for AVR systems

• Fast response to detect fault current demand

• Adjustable boost current level and duration

• Compatible with most Basler Electric static regulators

• Solid-state design for reliability and speed

• Easy integration with existing excitation panel

• LED status indication and fault monitoring

• Compact and rugged construction

Technical Specifications

The CBS 212 operates from the same auxiliary supply as the AVR (120/240 VAC or 125 VDC). It interfaces with the regulator's field output and control signals. The boost current can be set up to 200 percent of the regulator's nominal output. The boost duration is programmable from 0.1 to 10 seconds. The system has a response time of less than 5 milliseconds. Operating temperature is -20 to +60 degrees Celsius. The unit is housed in a metal enclosure suitable for panel mounting.

Operation Principle

The CBS 212 continuously monitors the generator terminal voltage and current. When a fault is detected by a significant voltage dip, the system initiates a boost command to the AVR, increasing the field current beyond the normal limit. This provides an additional short-circuit contribution, improving the operation of downstream protective relays. After the set duration, the boost is deactivated to prevent overheating of the generator rotor.

Installation and Configuration

Install the CBS 212 near the AVR in the control cabinet. Connect the control, power, and field interface wires according to the wiring diagram. Configuration involves setting the boost current level, duration, and activation threshold using potentiometers and DIP switches. Commissioning includes testing the boost function with a simulated fault.

Applications

Ideal for generators in industrial plants, remote power stations, and marine vessels where short-circuit strength is a concern. It is also used in cogeneration systems to ensure reliable fault clearing when connected to a weak utility grid.

Reliability and Compliance

The CBS 212 is built with high-grade components and has undergone extensive testing for electrical and mechanical endurance. It complies with relevant IEC and IEEE standards. Regular testing is recommended to confirm boost functionality.

Conclusion

Basler Electric CBS 212 Current Boost System enhances the short-circuit capability of generator excitation systems, improving fault clearance and system stability. Its fast response and flexible settings make it a valuable addition to any generator protection scheme.