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Harmonic Reduction of Prolec GE Transformer Data

 

Please see the Harmonics Reduction Tool YouTube video here: https://www.youtube.com/watch?v=fZ00oNlBoDc

 

The Harmonic Reduction tool has been tested with data acquired on a Prolec GE transformer, where there are severe harmonic peaks at 60 Hz and multiples of that frequency.

Prolec GE, located in Monterrey, Mexico, is one of the largest transformer manufacturers in the Americas, offering a complete line of transformer products necessary for the generation, transmission, and distribution of electric power. Prolec GE has over 30 years of experience in the industry, with products installed in more than 35 countries around the world. 

The data has around 80 dB dynamic range from the highest harmonic peak and then down to the noise floor. Since the modal response is not more than maximum 15 dB above the noise floor it makes any modal analysis difficult. The Harmonic Reduction tool is applied to "equalize" the heights of the harmonic and modal peaks.
Since the data has been acquired outside the core of the transformer there is a significant measurement noise, but even so the harmonic reduction is capable of reducing the harmonic peaks with more than 40 dB on an average.

Below the Singular Value Decomposition of the transformer data can be seen before and after the Harmonic Reduction tool has been applied: 

 

Figure 3: Singular Values of the spectral densities of the Prolec GE transformer data. Before harmonic reduction.

 

Figure 4: Same measurements after harmonic reduction of peaks at 60 Hz, 120 Hz, 180 Hz and 240 Hz.

Data provided with courtesy of project leader Mr. Raymundo Carrasco Aguirre, Prolec GE, Monterey, Mexico.


 


Structural Vibration Solutions A/S • Tel: +45 9635 4422 • Fax: +45 9635 4575 • svibs@svibs.com




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