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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Steve Conner wrote ...
I bought the capacitors (6uF, not 3) from a fellow 4hver in Finland. No customs issues as we're both in the European Economic Whatsitsname. They're overkill for the size of the bridge, but I can always add a second bridge later.
Just had a bit of a disaster with waterjet cutting of Tufnol primary supports that will set the project back a little while I source some more material and find an alternative way of making them. Not sure if Tufnol is ill-suited to waterjet cutting, or if the company I used just suck at it.
Secondary coil winding is scheduled for tomorrow evening.
Also this
I have had very good luck with making the supports out of polycarb. I also know that polycarb cuts like butter on the water jet.
The only failure of polycarb primary supports I have ever had was when I melted the supports, however in all fairness to the polycarb the primary was at 375*C and the copper primary was starting to anneal...
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Steve Conner wrote ...
Yup. I'm using Tufnol because it doesn't melt, so I can run more power without getting into water cooling.
I assume you would use oil and not water in such a situation, i have a feeling water could cause some problems with the current flowing though the water and pump side as well as the primary side...
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
wrote ...
Just had a bit of a disaster with waterjet cutting of Tufnol primary supports that will set the project back a little while I source some more material and find an alternative way of making them. Not sure if Tufnol is ill-suited to waterjet cutting, or if the company I used just suck at it.
Hey Steve. I'd be happy to cut you some polycarbonate supports on my CNC for no charge. (Just pay for the material and shipping back to you) I'd just need your drawing files.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Thomas W wrote ...
Steve Conner wrote ...
Yup. I'm using Tufnol because it doesn't melt, so I can run more power without getting into water cooling.
I assume you would use oil and not water in such a situation, i have a feeling water could cause some problems with the current flowing though the water and pump side as well as the primary side...
Keep up the amazing work :)
Actually, several people have run water cooled primaries including myself without issue.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Adding to the above, the HV lab at the university I went to had a continuous flow water resistor which was regularly used at many kV. They just used long thin hoses to feed it from the tap and it all worked fine.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Steve Conner wrote ...
Thanks for the offer EVR, but a few people have offered to do it locally.
The only trouble with water cooling is that any DC voltage across the water system can cause electrolytic corrosion. AC voltage is no problem.
Ah, okey then. My main thoughts were that if you have water flowing though a coil, it also provides a second circuit to allow current to flow... Has anyone tried measuring the current though the water pipes going around the pump and tank side of things?
I would really be interested if someone could do that, hooking their current probe around the pipe and seeing the current flow though the other direction compared to the one though the actual coil. :)
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Goodchild wrote ...
Thomas W wrote ...
Steve Conner wrote ...
Yup. I'm using Tufnol because it doesn't melt, so I can run more power without getting into water cooling.
I assume you would use oil and not water in such a situation, i have a feeling water could cause some problems with the current flowing though the water and pump side as well as the primary side...
Keep up the amazing work :)
Actually, several people have run water cooled primaries including myself without issue.
I have taken i a step further: Water cooled igbt bridge and primary in same loop with mains powered water pump. Has been one of very few things that have never caused any trouble during my experiments :)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hydron wrote ...
Adding to the above, the HV lab at the university I went to had a continuous flow water resistor which was regularly used at many kV. They just used long thin hoses to feed it from the tap and it all worked fine.
AFAIK this is also the method they use in high power tube transmitters with water cooled tubes.
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