Basler BE1‑32R Protective Relay

The Basler BE1‑32R is a solid‑state protective relay that combines reverse power and directional overcurrent protection functions. This model, with order code BE1‑E1P‑BON0F, is specifically designed for generator protection, preventing motoring conditions and detecting fault current direction in utility and industrial power systems. It ensures the integrity of prime movers and grid interconnection.

Key Features

The relay features adjustable reverse power trip level and time delay. The directional overcurrent element provides selective fault detection based on power flow direction. It includes a target indicator, test points, and LED status lights. The unit is housed in a compact draw‑out case for easy maintenance.

Technical Specifications

Input voltage: 120 or 240 VAC, 50/60 Hz. Current input: 5 A or 1 A CT secondary. Reverse power pickup: 0.5‑20% of rated power. Time delay: 0.1‑10 seconds. Directional overcurrent pickup: 0.5‑20 A. Operating temperature: -20°C to +55°C. Output contacts: 2 form‑C rated at 5 A at 250 VAC.

Operating Principles

The relay measures both voltage and current to determine real power direction. Under normal forward power flow, the relay remains inactive. If power reverses (e.g., generator motoring), the reverse power element initiates timing and trips after the delay. The directional overcurrent element uses voltage reference to determine fault direction, allowing selective tripping for faults in the forward direction.

Applications

This relay is used in generator sets to prevent motoring when the prime mover fails. It is also applied in utility interconnections to detect reverse power due to system faults or load imbalance. The directional overcurrent function is valuable for looped distribution networks.

Installation and Configuration

Mount the relay in a standard panel. Connect voltage and current inputs from PTs and CTs. Set the reverse power pickup, time delay, and directional overcurrent settings via potentiometers and DIP switches. A secondary injection test is recommended to verify correct operation.

Maintenance and Reliability

Periodic testing and calibration ensure continued accuracy. The solid‑state design provides high reliability. Visual inspection of connections and cleaning are sufficient.

Conclusion

The Basler BE1‑32R protective relay offers dual functionality with reverse power and directional overcurrent protection, making it an essential component for generator and interconnection protection.