Basler Electric BE1-67 Directional Overcurrent Relay
The Basler Electric BE1-67 is a solid-state directional overcurrent relay that provides phase overcurrent protection with directional sensing. It is used to protect transmission lines, distribution feeders, and generator circuits by detecting faults and determining their direction relative to the protected zone. The BE1-67 is known for its reliability, accuracy, and ease of coordination with other protective devices.
Key Features
Solid-state circuitry for long life and consistent performance
Directional element with adjustable torque angle
Phase overcurrent pickup adjustable over a wide range
Definite time and inverse time characteristics selectable
Independent directional and overcurrent settings
Output relay contacts rated for tripping and signaling
LED targets for fault indication
Compact and rugged case for panel mounting
Technical Specifications
The BE1-67 operates on 50/60 Hz systems with current inputs of 1 A or 5 A from CTs. The directional element has a characteristic angle adjustable from 0 to 90 degrees. Overcurrent pickup range is 0.5 to 20 A in 5 A CT secondary. Time delay settings range from 0.1 to 10 seconds for definite time, and inverse time curves conform to IEEE or IEC standards. The unit requires a 120 or 240 VAC auxiliary supply. Operating temperature is -20 to +65 degrees Celsius.
Protection Functions
The BE1-67 provides fast fault detection by combining overcurrent measurement with directional discrimination. It detects faults in the forward direction while ignoring reverse faults, enabling selective coordination with other relays. The relay is suitable for both radial and looped distribution systems. It can be used as main protection for feeders or backup protection for transformers and generators.
Installation and Configuration
Mounting is typically on a panel with the relay secured by front-panel screws. CT and PT connections are made to the rear terminals. Configuration involves setting the directional characteristic, overcurrent pickup, time delay, and output contact functions. Calibration is performed using test points and potentiometers. The relay includes a self-test feature to verify internal circuits.
Applications
Common applications include distribution feeder protection, substation bus protection, line protection in industrial facilities, and backup protection for generator step-up transformers. The BE1-67 is also used in marine and offshore power systems where directional overcurrent protection is required for selective fault isolation.
Compliance and Durability
The relay meets ANSI C37.90 and IEC 60255 standards for protective relays. It is designed to withstand high transient voltages and currents without damage. The enclosure provides protection against dust and moisture, making it suitable for harsh environments.
Conclusion
Basler Electric BE1-67 directional overcurrent relay offers reliable phase fault detection with accurate directional discrimination. Its solid-state design, adjustable settings, and broad application range make it a dependable component for power system protection schemes.
