Basler BE1-51 Overcurrent Relay

The Basler BE1-51 (model H5EZ1PB1C6F, also referenced as BE151H5EZ1PB1C6F) is a digital overcurrent relay designed for protection of generators, feeders, and transformers. This relay provides both phase and ground fault overcurrent protection with adjustable time-current curves, making it suitable for a wide range of industrial and utility applications. The BE1-51 offers reliable backup protection and is compatible with Basler's protection relay family.

The relay features microprocessor-based measurement with high accuracy and programmable settings. It includes a front-panel display and keypad for local configuration and monitoring. The BE1-51 supports Modbus communication for remote supervision and integration with SCADA systems. Its rugged construction ensures reliable operation in demanding environments.

Technical Specifications

• Model: BE1-51 (H5EZ1PB1C6F)

• Protection functions: Phase overcurrent (51), ground overcurrent (51N)

• Current sensing: 1/5 A CT inputs

• Time-current curves: Definite time, IEC, IEEE, and user-definable

• Pickup range: 0.05-20.00 A (adjustable)

• Time dial: 0.05-15.00 (adjustable)

• Accuracy: ±1% of pickup

• Output contacts: 2 form C (trip and alarm)

• Communication: Modbus RTU (RS-485)

• Power supply: 24-240 V AC/DC (universal)

• Display: 2-line LCD with keypad

• Operating temperature: -40°C to +70°C

• Certifications: CE, UL, RoHS

Functional Features

• Overcurrent protection: Provides phase and ground fault protection with multiple curve options.

• Programmable settings: Pickup and time delay can be adjusted to coordinate with other devices.

• High accuracy: ±1% accuracy ensures reliable protection without nuisance tripping.

• Communication: Modbus RTU enables remote monitoring and configuration.

• Event recording: Stores fault events for post-fault analysis.

Typical Applications

• Generator backup protection: Phase and ground fault protection for synchronous generators.

• Feeder protection: Overcurrent protection for distribution circuits.

• Transformer protection: Backup protection for power transformers.

• Motor protection: Overcurrent protection for large motors.

Installation and Configuration

Mount the BE1-51 on a panel. Connect the CT inputs, power supply, and output contacts. Configure the pickup values, time-current curves, and communication settings using the front-panel keypad or through Modbus. The relay includes a test mode for commissioning and verification.

Compliance

Complies with IEEE C37.90, IEC 60255, CE and UL approved, RoHS compliant.

Conclusion

The Basler BE1-51 provides reliable, flexible overcurrent protection for generators and feeders, offering essential protection and communication features in a robust, field-proven package.