Basler BE1-60 Solid‑State Voltage Balance Relay

The Basler BE1-60 is a solid‑state protective relay designed to monitor voltage balance in three‑phase power systems. This relay provides protection against voltage unbalance conditions that can cause overheating, vibration, and premature failure of generators, motors, and transformers. The BE1-60 continuously compares the three phase voltages and trips when the negative‑sequence voltage exceeds a preset threshold.

The relay features high‑accuracy measurement with adjustable pickup levels and time delays. It includes a front‑panel display for local monitoring and settings. The BE1-60 is housed in a rugged enclosure suitable for panel mounting in industrial and utility installations.

Technical Specifications

• Model: BE1-60

• Protection type: Voltage balance (negative sequence)

• Voltage sensing: 3‑phase, 0‑600 V AC

• Pickup range: 1‑20% negative sequence (adjustable)

• Time delay: 0.1‑30 seconds (adjustable)

• Accuracy: ±1% of setting

• Output contacts: 2 form C (trip and alarm)

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

• Display: 2‑line LCD with keypad

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

• Certifications: CE, UL, RoHS

Functional Features

• Voltage unbalance detection: Protects equipment from negative‑sequence voltages.

• Adjustable settings: Pickup and time delay can be field‑adjusted.

• High accuracy: Ensures reliable protection without nuisance trips.

• Event recording: Stores unbalance events for analysis.

Typical Applications

• Generator protection: Preventing rotor heating and vibration.

• Motor protection: Avoiding overheating from unbalanced supply.

• Transformer protection: Monitoring voltage balance for winding stress.

Installation and Configuration

Mount the relay on a panel, connect PT inputs, power supply, and output contacts. Configure pickup and time delay via the front‑panel keypad.

Compliance

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

Conclusion

The Basler BE1-60 provides reliable voltage balance protection, safeguarding critical equipment from unbalanced supply conditions.