From: Marco Denicolai
Date: Thu, 28 Jun 2001 14:24:21 +0300
Subject: Re: [TSSP] Toroid breakdown voltage indirect meas.
Hi Paul, Paul wrote: > > Marco Denicolai wrote: > > > Primary tap at 7.5 turns, primary cap is 0.0967 uF. > > Thanks. I also put your primary at 5cm above the secondary base to > get the required coupling. Now I get much the same waveform that > you do, peaking at around 550kV for 18.35kV on the primary. Good. > > According to ET6, the toroid should reach a surface 26kV/cm at > 440kV, so we have a 20% discrepancy to investigate. :( > > Something that would be very useful is a scope trace of the > secondary base current - do you have one available? The reason > is that, with your fairly high k factor, the model predicts quite > a noticeable amount of higher mode ringing. Doesn't show up in the > top volts or primary current, but is prominent in the base current. > A base current trace would indicate whether this is real or an > artifact of the software. If everything goes OK, during the weekend I could be able to add the second strike rail and turn again Thor on. I could place a current transformer on the secondary grounding, then a length of 50 ohm coax to the memory scope. On the other channel a free probe. Then I would have secondary voltage (sort of) and secondary current together. I would run at, say 10 kV, to avoid leader inception. Hopefully the CCPS is fully repaired as I suppose, otherwise it will break again pretty fast. Let's see... Best Regards -- _____________________________________________________________ Marco Denicolai Senior Design Engineer Tellabs Oy tel: +358 9 4131 2769 DSL Products mobile: +358 50 353 9468 Sinikalliontie 7 fax: +358 9 4131 2410 02630 Espoo FINLAND email: marco.denicolai@tellabs.com _____________________________________________________________
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.