Basler Electric BE1-79MA10A6JC0L0F Automatic Reclosing Relay

The Basler Electric BE1-79 is a microprocessor‑based automatic reclosing relay designed to enhance the reliability of overhead power lines. It automatically initiates a reclosing sequence after a circuit breaker trips due to a transient fault, restoring service quickly and reducing customer outage minutes. The relay supports multiple shot sequences, dead times, and reclaim times, making it adaptable to various network configurations.

Advanced Reclosing Logic

The BE1-79 offers up to four reclosing shots with independently programmable dead times and reclaim times. It can be set for single‑shot, multi‑shot, or high‑speed reclosing schemes. The relay includes a synchronism check feature to ensure that the line is re‑energised only when voltage conditions are safe. A blocking input allows external signals (e.g., from communication-assisted protection) to inhibit reclosing during permanent faults.

User Interface and Settings

Programming is performed via front‑panel pushbuttons and an alphanumeric LCD display. The intuitive menu guides the user through setting pickup values, time delays, and operational modes. Non‑volatile memory stores all settings, and a battery backup retains the real‑time clock for event logging. The relay records the last 10 events with time stamps for post‑fault analysis.

Technical Specifications

Input voltage: 120/240 VAC or 24–250 VDC. Frequency: 50/60 Hz. Output contacts: 2 Form C, rated 5 A at 250 VAC. Dead time range: 0.1–300 s. Reclaim time range: 1–600 s. Operating temperature: –30°C to +70°C. The relay meets IEEE C37.90‑2005 surge withstand and fast transient requirements.

Applications

This reclosing relay is used on overhead distribution feeders, transmission interconnections, and industrial power systems with overhead lines. It is particularly effective in areas with frequent lightning strikes or temporary faults, where automatic reclosing significantly improves service continuity. The BE1-79 can be coordinated with other protection relays to achieve selective fault isolation.

Installation and Maintenance

Panel mounting is standard, with rear terminal connections for power, voltage inputs, and control signals. The relay includes a built‑in test facility for verifying reclosing logic without energising the breaker. Routine maintenance consists of periodic checks of the battery and cleaning of the display. The solid‑state design ensures long-term reliability with minimal wear.

Conclusion

The Basler Electric BE1-79MA10A6JC0L0F automatic reclosing relay is a versatile and dependable solution for improving power system reliability. Its programmability, robust construction, and user‑friendly interface make it a preferred choice for utilities and industrial facilities.