Basler Electric BE1‑32R Power Solid State Relay

The Basler Electric BE1‑32R (style E2E A10 A0N0F) is a solid‑state directional power relay that detects reverse power flow in generator circuits. It is used to protect prime movers—including steam turbines, gas turbines, and diesel engines—from motoring action, which occurs when the generator loses its driving torque and draws power from the electrical grid. This condition can cause severe damage to turbine blades and engine components. The relay measures real power and operates when power flows from the system into the generator.

Measurement and Settings

The relay uses voltage and current inputs to compute the real power magnitude and direction. An adjustable pickup setting, typically from 0.1 to 5% of rated power, determines the reverse power threshold. A time delay, adjustable from 1 to 30 seconds, prevents nuisance trips during transient disturbances. The relay features a front‑panel dial for pickup adjustment and a potentiometer for time delay. A target indicator shows trip status, and a manual reset button is provided for clearing the target.

Directional Sensing and Accuracy

A built‑in phase‑shift network compensates for CT and PT phase errors, ensuring accurate directional discrimination. The relay is insensitive to reactive power and harmonics, focusing solely on real power flow. It includes a test jack for injecting voltage and current signals to simulate reverse power conditions during commissioning. The relay offers pickup accuracy of ±3% of setting.

Technical Specifications

Voltage input: 100‑480 VAC, 50/60 Hz. Current input: 1 A or 5 A secondary. Pickup accuracy: ±3% of setting. Time delay: 0.1‑30 seconds, adjustable. Output contacts: 2 Form C (SPDT), rated 5 A at 250 VAC. Power supply: 24‑250 VDC or 120‑240 VAC. Operating temperature: –30°C to +70°C. The relay meets IEEE C37.90 surge withstand capability.

Applications

The BE1‑32R is essential for protecting steam turbines, gas turbines, and diesel generators from reverse power. It is used in co‑generation plants, emergency standby systems, and industrial power systems. The relay can also detect loss of excitation or prime mover failure. It is often coordinated with other protection relays for complete generator protection.

Installation and Commissioning

Mount the relay in a standard panel cutout. Connect voltage inputs from the generator bus and current inputs from the CTs, ensuring correct polarity for proper directional sensing. Commissioning involves setting the pickup and time delay, then testing with a secondary injection test set. The relay includes a built‑in test pushbutton for quick verification.

Reliability and Standards

Compliant with ANSI/IEEE C37.90 and IEC 60255, the BE1‑32R is built with solid‑state circuitry and conformal coating for harsh environments. Its self‑supervision monitors internal circuits and provides a warning output on failure. Regular calibration is recommended but not frequently required due to the stable design.

Conclusion

The Basler Electric BE1‑32R power solid‑state relay (E2E A10 A0N0F) is a precise, dependable, and robust solution for reverse power protection. Its flexible settings and proven design ensure the safety of critical prime movers in any power generation facility.