Basler Electric BE1-59N A6E E1C B0N1F Neutral Overvoltage Relay

The Basler Electric BE1-59N is a specialised solid-state relay designed to detect overvoltage on the neutral point of a transformer or generator. It is commonly used in resistance-grounded systems to sense the voltage developed across the grounding resistor during a ground fault. This voltage is proportional to the fault current, and the relay trips when the neutral voltage exceeds a safe level, thereby isolating the faulted equipment.

Key Features

The BE1-59N offers adjustable pickup settings from 5 to 300 VAC (neutral voltage), with independent time delay adjustments from 0.05 to 10 seconds. The relay provides high sensitivity to low-level ground faults while maintaining immunity to system transients. It includes a trip indicator, a manual reset pushbutton, and auxiliary output contacts for remote alarms or control.

This relay is housed in a compact, dustproof enclosure suitable for switchgear mounting. It features a built‑in power supply that accepts a wide range of DC or AC voltages, simplifying integration with existing station batteries or control circuits.

Technical Specifications

Input voltage: 5–300 VAC, 50/60 Hz. Pickup accuracy: ±2% of setting. Time delay: 0.05–10 s, selectable. Output contacts: 1 Form C, rated 5 A at 250 VAC. Burden: less than 5 VA. Operating temperature: –20°C to +65°C. Dielectric withstand: 2 kV RMS for one minute.

Applications

The BE1-59N is ideal for protecting power transformers, generator neutrals, and reactor‑grounded systems. It is widely used in industrial plants, utility substations, and renewable energy installations where ground fault detection is critical. The relay can also be applied in ungrounded or high‑resistance grounded systems to provide early warning of developing faults.

Installation and Commissioning

Mounting the relay requires a standard panel cutout. Wiring connections are clearly labelled for neutral input, power supply, and output contacts. Commissioning involves setting the pickup level and time delay based on system grounding characteristics and coordination studies. A test button allows simulation of neutral voltage for functional verification.

Reliability and Standards

Built to Basler Electric’s stringent quality standards, the BE1-59N complies with ANSI/IEEE C37.90 and IEC 60255 for protective relays. Its solid‑state circuitry is immune to mechanical wear, ensuring long maintenance‑free operation. The relay’s self‑diagnostic features monitor internal power supply and sensing circuits, providing a health status output.

Conclusion

The Basler Electric BE1-59N A6E E1C B0N1F neutral overvoltage relay offers precise, reliable protection for grounded power systems. Its adjustable settings, robust construction, and ease of use make it an essential component for safeguarding critical electrical assets.