Basler Electric BE1‑67 Ground Directional Overcurrent Protective Relay

The Basler Electric BE1‑67 is a solid‑state directional overcurrent relay specifically designed for ground fault (earth fault) protection. It combines directional sensing with overcurrent detection to provide selective protection for grounded power systems. The relay operates by comparing the phase angle between the zero‑sequence voltage and current, determining the direction of the fault and tripping only for faults in the forward direction.

This relay is essential for systems where multiple sources or parallel feeders exist, ensuring that only the faulted section is isolated, maintaining supply to healthy parts of the network. The BE1‑67 offers adjustable pickup current, time delay, and directional angle, providing flexibility for various system configurations.

Key Features

• Directional ground overcurrent protection

• Adjustable pickup: 0.1–10 A (secondary)

• Time delay: instantaneous or inverse‑time curves

• Directional angle adjustment: 0–90°

• High immunity to CT saturation

• Target indicator for trip identification

Technical Specifications

Input: 1A or 5A CT secondary; voltage input for polarisation: 120 VAC; frequency: 50/60 Hz; accuracy: ±3% for pickup; operating temperature: -20°C to +65°C; output contacts: 2 x SPDT, 5 A.

Applications

Commonly used in substation protection, generator step‑up transformers, distribution feeders, and industrial plant power systems. The BE1‑67 is particularly valuable in networks with high impedance grounding.

Installation and Settings

Mount the relay in a standard relay panel. Connect CT and PT leads as per the wiring diagram. Set the pickup current, time delay, and direction angle using the front‑panel knobs and DIP switches. The relay includes a test plug for verification.

Reliability and Maintenance

With robust analog circuitry, the BE1‑67 provides dependable performance with minimal maintenance. The relay is immune to electromagnetic interference and operates reliably in harsh environments. Periodic testing is recommended to ensure setpoint accuracy.

Why Choose the BE1‑67?

This relay is a trusted solution for ground fault protection, backed by Basler Electric’s extensive expertise. Its directional capability enhances selectivity, reducing unnecessary outages. The BE1‑67 is a cost‑effective alternative to more complex microprocessor relays for many applications.

In conclusion, the Basler Electric BE1‑67 provides reliable and selective ground fault protection, ensuring system stability and safety.