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WR400

The Rogowski Current Transformer (Rogowski CT) is an AC current sensor that measures current without direct electrical connection to the conductor. It is designed for current measurement in industrial power and distribution networks.
With its flexible structure and air-core (non-magnetic core) design, the Rogowski coil is installed in a loop around a cable or busbar, enabling current measurement without disconnecting the circuit or causing downtime.

Unlike conventional core-type current transformers (fixed CTs), the Rogowski coil does not suffer from magnetic saturation and is capable of accurately capturing high and transient currents.

Rogowski current transformers operate correctly only when connected to compatible measuring equipment. Their output is a low-level voltage signal, which requires a dedicated Rogowski input on the measuring device for proper signal processing.

This series of Rogowski CTs is available in three different models with varying lengths, allowing selection based on the cable or busbar diameter:

  • WR300 with a length of 30 cm
  • WR400 with a length of 40 cm
  • WR500 with a length of 50 cm

The  only difference between these models is only the coil length; selection of the appropriate Rogowski coil depends on the size of the cable or busbar and the available installation space.

Applications of Rogowski Current Transformers

  • Current measurement in low-voltage distribution panels and secondary medium-voltage systems
  • Installation on high-current cables and busbars
  • Retrofit projects for upgrading existing panels
  • Energy consumption monitoring and load analysis
  • Use with power analyzers, RTUs, and protective relays

Why Choose a Rogowski Current Transformer?

  • No magnetic saturation, even under high and transient current conditions
  • High safety, as no dangerous voltage appears at the output even when the coil loop is open
  • Fast and easy installation without disconnecting the cable
  • High flexibility for cables and busbars of different sizes
  • Wide frequency response, suitable for harmonic measurement
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