Basler Electric PRS-250 Protection Relay System

The Basler Electric PRS-250 is a versatile protection relay system that combines multiple protection functions in a single compact unit. It is designed for generators, transformers, and feeders, providing reliable protection against overcurrent, overvoltage, undervoltage, frequency deviations, and other abnormal conditions. The PRS-250 is fully programmable, allowing users to tailor the protection settings to specific application requirements.

Key Features

• Multiple protection elements: overcurrent (50/51), voltage (27/59), frequency (81O/U), reverse power (32), and more

• Programmable logic and setting groups for different operating modes

• High-resolution display for local monitoring and configuration

• Communication interfaces: RS-485, Ethernet, Modbus

• Event recording with time-stamped data

• Flexible I/O with digital inputs and relay outputs

• Self-diagnostics and health monitoring

• Compact design for panel mounting

Technical Specifications

The PRS-250 operates from 120/240 VAC or 24 to 125 VDC. Current inputs accept 1 A or 5 A CT secondary, voltage inputs up to 300 VAC. Accuracy: ±1 percent for protection, ±0.5 percent for metering. Operating temperature: -20 to +70 degrees Celsius. The unit meets IEC 60255 and IEEE C37.90 standards.

Protection Functions

Standard functions include phase and ground overcurrent, undervoltage and overvoltage, overfrequency and underfrequency, and reverse power. Optional functions include directional overcurrent, differential, and thermal protection. The relay can be configured with multiple setting groups, allowing automatic switching based on system conditions.

Configuration and Communication

Setup is done via the front keypad or through a PC software tool. The relay supports Modbus RTU and TCP for integration with SCADA. It also has built-in web server for remote access.

Applications

Suitable for utility generators, industrial cogeneration, distribution feeders, and motor protection. The PRS-250 is also used in marine and offshore installations due to its rugged construction.

Reliability and Compliance

Manufactured under ISO 9001, the relay is CE and UL certified. It has undergone rigorous EMC and environmental testing for industrial applications.

Conclusion

Basler Electric PRS-250 protection relay system offers comprehensive protection and monitoring in a single device. Its flexibility, communication capabilities, and reliability make it an excellent choice for modern power systems.