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*To*: tesla@xxxxxxxxxx*Subject*: Re: SISG IGBT power loss calculations*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Wed, 24 May 2006 10:26:39 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Wed, 24 May 2006 10:12:23 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <_5L-Zzu_OGK.A.X9E.nXIdEB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx> Hi Terry,

We will need to try this on a 21KV SISG string. Gerry R.

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx> Hi All, I have been matching figures 10 and 11 in the SISG pdf: http://drsstc.com/~sisg/SISG.pdfto models. It appears that the very low resistance allows theinductance of the SISG gap to become significant and thus is whyvoltage and current are out of phase. It is neat because that givesthe resistance a poorer power factor which makes it run cooler :-))The gap appears to be a 0.020 ohm resistor in series with a 20nHinductor. So for power calculations, each gap section dissipates theprimary loop RMS current squared multiplied by 0.020 ohms.http://drsstc.com/~sisg/SISG-Model-01.gif http://drsstc.com/~sisg/SISG-Model-02.gif http://drsstc.com/~sisg/SIDAC-IGBT-3.schFor my 183 watt test, the RMS primary current is 11 amps, so thepower in the five sections is 12 watts total.Thus, the gap is loosing about 6.6% of the total coil energy. Theonly other major loss would be in my big secondary made from #28wire that probably dissipates 8 watts as heat. So with 183 wattsin, about 163 watts is making it to the streamer for an efficiencyof 89%. That would actually place an upper limit on the Freau valueof 2.35. To get there (or real close) one needs to reduce the RMScurrent and make the secondary reasonably low loss. Lots oftradeoffs to juggle there...Cheers, Terry

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