ACREL BR Series Flexible Rogowski Coil Current Transformer

 

The ACREL BR Series Flexible Rogowski Coil Current Transformer uses a flexible Rogowski coil to measure AC current around an electrical conductor. The coil is placed around the conductor and connected to a compatible measuring instrument or energy meter. Acrel states that the BR series is designed for applications such as energy consumption monitoring, high-frequency monitoring and DC ripple measurement.

The three models provide different coil sizes:

• BR-90 - 90 mm internal diameter and 1000 A primary input
• BR-150 - 150 mm internal diameter and 2000 to 5000 A primary input
• BR-200 - 200 mm internal diameter and 4000 to 8000 A primary input

The manufacturer lists secondary outputs of 200 mV or 333 mV depending on the model and configuration. Other sensitivities may also be available as specified by Acrel.

How It Works

• The flexible Rogowski coil is positioned around the conductor carrying the AC current.
• The coil senses the magnetic field produced by the current.
• The resulting signal is provided as a low-level voltage output for connection to a compatible measuring device.
• The installation direction should correspond with the actual forward current direction when fitted to the monitoring circuit.

Why Choose This Product

• Flexible construction makes installation around existing conductors practical.
• Multiple internal diameters accommodate different conductor arrangements.
• High-current measurement ranges are available across the BR-90, BR-150 and BR-200 models.
• The series provides a wide bandwidth of 1 Hz to 10 kHz.
• The coil is lightweight and designed for clamp-on installation.

Benefits

• Supports non-intrusive AC current measurement.
• Suitable for high-current electrical monitoring.
• Flexible construction can simplify installation where access is restricted.
• Low positional error and good linearity support consistent current measurement.
• The manufacturer specifies 100 percent shielding for both the coil and signal cable.