Application Notes

Utilizing AcuCT Flex Pro Rogowski Coils for Protection Relaying

Date: February 02, 2026

The AcuCT Flex Pro Series Rogowski Coil is an air-core sensor engineered for protection relays with LPIT or Rogowski inputs, utilizing a non-magnetic design that eliminates saturation to ensure linear measurement up to 50 kA fault currents. Compliant with IEC 61869-10 and certified for protection class 5P50kA, it delivers high-fidelity current reproduction under transient conditions without the burden limitations of conventional CTs. This application note provides technical configuration parameters for integrating the sensor with contemporary feeder protection relays.

Key Highlights

Air-core Rogowski coil design eliminates magnetic saturation during high fault currents
Compliant with IEC 61869-10 with protection accuracy up to 5P50kA
Supports reliable current measurement in feeder protection systems
Direct integration with LPIT/Rogowski input protection relays via RJ45 interface
Includes amplitude and phase correction factors for precise relay configuration

AcuCT Flex Pro Series

Rogowski Coil CT for Protection Relays

The AcuCT Flex Pro Series Rogowski coil delivers precise, factory-calibrated current sensing for modern protection relays. With IEC 61869-10 Class 5P50kA accuracy, it ensures reliable fault detection and low-distortion signals, while RJ45 connectors.

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