Sweep Frequency Response (SFRA)

Frequency response analysis (often referred to as FRA or SFRA) is a powerful and sensitive method for testing the mechanical integrity of transformer cores, windings, and press frames, in power transformers.

Every electrical network has a unique frequency response – its so-called "fingerprint". Network faults or vibrations can cause changes in this frequency response.

Comparing the measurements taken at various phases or on multiple identical transformers, as well as comparing measurements with the former fingerprint of the same transformer, provide indications of any mechanical or electrical changes.

We recommend testing the frequency response particularly after:

  • after transport of transformers
  • after faults at high currents have occurred

You can use our testing solution for checking if windings have been damaged and then initiate any further action that may be necessary.

Expert recommends


FRANEO 800 was developed for testing the mechanical and electrical integrity of power transformers after transportation or exposure to high fault currents.

It uses the sweep frequency response analysis (SFRA) principle. SFRA measures the electrical transfer function over a wide range of frequencies.

With our FRANEO 800 you can improve your transformer reliability, reduce maintenance costs and prevent expensive failures.

Benefits of this solution



Sweep Frequency Response Analysis with FRANEO 800

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