The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
I decided to re-fit the safety covers that I moulded in fibreglass many years ago to cover up the exposed electrical connections to the pot part of the furnace - I couldn't remember why I'd not put them back - now I realise !
It turns out that when I decided to put heavy cable strap links across the quick disconnect fittings as their snap balls were suffering from the huge currents that they were carrying I fitted the straps in such a way that they foul the cover :bang: It can be re-worked I think fairly easily but not today - my fingers are falling off having done the little I've already done !
awemawson:
It turned out that the 'modification' was far less of a problem than I'd feared - merely having to shorten the 70 mm CSA cables by about two inches and having ensured that both lugs on a link were mutually at 90 degrees fix the outer one to the underside of the wide copper strip rather than the top. This way the 12 mm bolts no longer fouled the case nor did the link loops.
Altogether much more satisfactory and certainly safer than it has been. There's enough to keep an eye on when pouring hot metal without also risking inadvertent electrocution !
So it's now as I'd intended to years back. I had the pattern I'd made for the fibreglass cover kicking about for a long time but I suspect that it's been disposed of now.
hermetic:
Looking good Andrew, its coming together well! I am a bit ticklish on high volts/current today. I used to think nothing about terminating up to 600V at many hundreds of amps, but it is something I have found as I get older that I double and treble check insulation barriers and seperation.Even installing my new 3 phase service panel made me a little nervous after I have been out of the industry for so many years, and I have a huge 3 phase steam cleaner which I "haven't got round to testing" after rebuilding it!!
Phil
awemawson:
Thanks Phil for the kind words. I made the cover when I was still in Bromley so that's at least 15 years ago. Trouble is not only is this high (ish - 600 v) voltage but it's about 3 kHz with spikey fast rising edges so it doesn't behave like normal 50 c/s stuff !
Cast your minds back to when the feeder hose / cables were resting too close to the stainless steel braded air hoses, and the coupling induced so much current to set them on fire 1
Post #756 here : https://www.madmodder.net/index.php/topic,13100.msg160605/topicseen.html#msg160605
So my next task is to make something a bit more suitable than the offcut of floor board that I'm currently (sorry for the pun) using !
hermetic:
it's about 3 kHz with spikey fast rising edges so it doesn't behave like normal 50 c/s stuff !
:zap:
Narsty!!
Phil
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version