Hi Steve,Great work! Getting a complex HF solid-state drive system to work at 33kVA is no small feat. The coilform seems nice and compact too for that throughput. At 480VAC input and 25ft arcs, your new DRSSTC is comparable in many ways to the 120L Experimental Coil, described here in the TCBA news, summer of 1990:
http://www.lightninglab.org/gallery/3rdStLab/TCBA_GELeyh.pdfIn 1998 we increased the 120L's primary Zchar from 5 to 15ohms, greatly reducing the rotary gap losses, then doubled the toroid size. These two changes reduced the wallplug draw from 40kW down to about 25kW and increased the arc length to about 25ft, bringing it roughly in line with the old '1kW per foot' benchmark.
What would you say has been the most difficult aspect in realizing your new DRSSTC coil? -GL
From: Steve Ward <steve.ward@xxxxxxxxx> Hi Everyone, Just a post about a recent project of mine. Many hands involved on this one (see credits later). So far its just a prototype, but results are promising: http://www.flickr.com/photos/kickermagnet/5811280440/in/photostream This is, as far as im aware, the largest Double Resonant Solid State Tesla Coil built and working as intended. The machine stands 15 foot tall (to the top of the toroid). With breakout point at 16 foot above the ground, its made some 25 foot sparks. Power input at 200bps was measured at 33kVA (480VAC 3 phase, about 40.5A RMS). I estimate a power factor of .92 given the line reactor used to smooth the current peaks charging the 2kJ of DC bus storage. The secondary is 24" diameter and wound to just over 8 feet length. The toroid is 96" by 16", and is indeed very ugly.
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