|Software for Operational
Harmonic Reduction of Prolec GE Transformer Data
Please see the Harmonics Reduction Tool YouTube
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:
Singular Values of the spectral densities of the Prolec GE
transformer data. Before harmonic reduction.
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.