Basler BE1-67 Directional Overcurrent Relay

The Basler BE1-67 (style B1E Z2J A3C3F) is a digital directional overcurrent relay designed for protection of generators, feeders, and transformers in utility and industrial power systems. This relay provides directional phase overcurrent and ground overcurrent protection, enabling selective fault detection by sensing the direction of fault current flow. The BE1-67 is essential for interconnected systems where coordination is critical.

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, and supports Modbus communication for remote supervision. Its rugged construction ensures reliable operation in demanding environments.

Technical Specifications

• Model: BE1-67 (B1E Z2J A3C3F)

• Protection functions: Directional phase overcurrent (67), directional ground overcurrent (67N)

• Current sensing: 1/5 A CT inputs

• Voltage sensing: 3‑phase, 0‑600 V AC (for polarization)

• Time‑current curves: Definite time, IEC, IEEE

• Pickup range: 0.05‑20.00 A (adjustable)

• Directional characteristic: 0‑360° (adjustable)

• Accuracy: ±1% of pickup

• Output contacts: 4 form C (trip, alarm, etc.)

• Communication: Modbus RTU (RS‑485)

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

• Display: 4‑line alphanumeric LCD with keypad

• Event recording: 64 events, 20 fault records

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

• Certifications: CE, UL, RoHS

Functional Features

• Directional overcurrent protection: Provides selective fault detection by sensing fault current direction.

• Programmable settings: Pickup, time‑current curve, and directional characteristic can be field‑adjusted.

• Voltage polarization: Uses voltage inputs to establish reference for directional elements.

• Event recording: Stores fault data for post‑fault analysis.

• Communication: Modbus enables remote monitoring and setting changes.

Typical Applications

• Generator protection: Directional backup protection for stator faults.

• Feeder protection: Directional overcurrent for distribution feeders.

• Transformer protection: Backup directional protection for transformers.

• Bus protection: Directional overcurrent for bus fault detection.

Installation and Configuration

Mount the BE1-67 on a panel. Connect CT inputs, PT inputs for polarization, power supply, and output contacts. Configure the protection elements, directional characteristic, and communication settings using the front‑panel keypad or via Modbus.

Compliance

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

Conclusion

The Basler BE1-67 provides advanced directional overcurrent protection, enabling selective fault clearing in interconnected power systems.