What is SFRA? and what we get the graph and how to read it?

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SFRA stands for Sweep Frequency Response Analysis. It is a test used to analyze the frequency response of transformers.

SFRA is a non-invasive test used to detect winding deformation, core movement, and other mechanical issues in transformers.
The test involves sweeping a frequency range and measuring the response of the transformer.
The results are plotted on a graph, which can be used to identify any abnormalities in the transformer's frequency response.
The graph is read by analyzing the shape and position of the curves, which can indicate the type and severity of any issues.
SFRA is a useful tool for preventative maintenance and can help avoid costly transformer failures.
For example, if the graph shows a shift in the resonance frequency, it could indicate a winding deformation or core movement.

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