Hi JohnI remember the tests vaguely, but I have forgotten the specifics. I have performed testing to prove this or that, and yet, it's difficult to remember the details of the tests after enough years. I guess that's part of coiling. I've forgotten more than I know (for good or bad). But, you say that you are surprised that coilers haven't done tests in this area. I'm not so surprised myself. This area is not well known. To some degree it is, but little has been done regarding testing. Richie is the only one I know that has actually gone into some detail about ballasting and much of that was through his use of Microsim and some excellent hands on experience. Excellent stuff! Yet, I myself have not dug that deep.
I run STR with a 10kva pig, but I also use a variable current ballast. I have both voltage and current control for any coil using my control cabinet, but there is a limit. Two 4th of July's ago I smoked my variac ballast. No short (very lucky) so I was able to clean up and continue to use. However, I am more cautious these days. I can't go over 7 kva without ballast issues.
Take care, Bart FutureT@xxxxxxx wrote:
In a message dated 5/26/2008 5:06:42 P.M. US Eastern Standard Time, bartb@xxxxxxxxxxxxxxxx writes:Hi Bart,I did some power factor tests back when, but I forget all the results. AllI remember for sure is that the power factor for PT's running resonant or near resonant at 120 bps was excellent. I remember reading an article in TCBA News about some guys that built larger coil running with a async rotary, and they mentioned that the power factor was not very good. They were probably running STR, and they expressed the desirability of adding some power factor correction, however they didn't attempt to do this. In any case it would be easy to do some PFC tests by trying variouscap values to see if it reduces the apparent power draw for STR systems. I'm surprised coilers haven't done more tests in that area. Cheers,John
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