Power Conditioners

atmasphere- 
Your point about non-sinusoid output waveform and generated secondary harmonics are well taken.

However, Sola mitigated this by adding an additional “neutralizer” winding in the secondary.  The following document contains a description of how it works.  Refer to the PDF page 4 under the heading “Ferroresonant power conditioners and harmonics”.  

https://www.emerson.com/documents/automation/product-guide-solahd-power-conditioners-en-us-99748.pdf

@puffball08 Nice! Sola has managed a nice improvement on where they were with this 20 years ago! 3% THD seems to be the number; A good power conditioner should be able to do about 0.5% THD (Elgar was getting this with their conditioners 35-40 years ago).


I tried using a ferro-resonant device made by Sola about 17 years ago in a power supply that featured AC line regulation- the noise out of the transformer was so profound that some of the circuitry in the amplifier developed oscillations. It would be interesting to revisit this and see if a conditioner with a device like this would be practical.

@atmasphere,

You may find this interesting.  This is Joseph Sola’s original patent from 1938 for a constant potential transformer, the forerunner of what Sola makes today.

https://patents.google.com/patent/US2143745A/en

Anyone using a Powerisolator from Transparent Cable?
Another +vote for Richard Gray Power Company 400 Pro.

Happy Listening!