Re: Power Factor Correction
Subject: Re: Power Factor Correction
From: Terry Fritz <twftesla-at-uswest-dot-net>
Date: Thu, 29 Jul 1999 20:27:16 -0600
Hi Dr. Resonance,
I am a little different than most. Since I do reasearch work and lots of
measurement and testing stuff. I want to be able to return the coil to
it's exact original condition if something blows up. Thus, I use
of-the-shelf parts that I can replace easily with the exact same type.
Also, if someone wants to copy something, I can refer them to a source of
the exact part to be sure the results are indentical. So I pay a bit more
Of course, the typical person can go out and get parts wherever they can
find them with no problem...
At 10:09 AM 7/29/99 -0500, you wrote:
>to: Terry, et al
>Why not just buy them surplus for $2-3 each and save lotsa $$$?
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
>Date: Thursday, July 29, 1999 4:25 AM
>Subject: Power Factor Correction
>>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>> I was playing with computer models all day today and got interested in
>>power factor correction caps. I found I can get my coil down to about 8.2
>>amps RMS input by adding 140uF of capacitance across the neon input. This
>>will reduce the VA input from around 1550 to about 1000. Digi-Key sells
>>little 20uf AC caps for fairly cheap and using a bunch of these would allow
>>for easy adjustment of the value. Reducing the input current would take
>>the load off the control box parts and let me run the coil and gap motor
>>off the 15 amp power strip (the strip breaker likes to blow otherwise). I
>>did have a few questions for those that know about such things.
>>I notice that same AC capacitors (like ones from GE) are significantly more
>>expensive than others. They are all full-time motor run caps made with
>>polypropylene (I bet some or oil filled) but I was wondering why the price
>>difference for what appears to be the same cap? the 60UuF were $15 for one
>>manufacturer and $65 for GE... Digi-Key sells only 20uF but the price is
>>faily good for the value I need even if I do need to use 7 of them...
>>Are there any hidden things I should know about like inrush currents, cap
>>explosions, openload or short problems? I ran some models with various
>>faults and all looked very good but...
>>Is there any easy way to calculate the cap value for a real coil with all
>>of it's dynamics? MicroSim could easily find the value but I was wondering
>>if there was an easy equation or something like that. The value is not