Glassman 4kw supply on ebay - if you have 3-phase...

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kbonin
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Glassman 4kw supply on ebay - if you have 3-phase...

Post by kbonin » Sun Aug 17, 2003 4:42 am

Here's the unit : http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 32720&rd=1

Link to this family page at Glassman : http://www.glassmanhv.com/ByWattage/pk_series.shtml

Wish the place I'm in had 3-phase... (nerdly sigh)

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by guest » Tue Aug 19, 2003 6:14 pm

You can buy 1PH to 3PH convertors. Search on www.use-enco.com or other machine tool distributers. While I don't think you'll find a 4KW unit, I do believe they sell 2KW well under $1000.00 I think the 1KW units sell for about $300.00.


Kerry Bonin wrote:
> Here's the unit : http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 32720&rd=1
>
> Link to this family page at Glassman : http://www.glassmanhv.com/ByWattage/pk_series.shtml
>
> Wish the place I'm in had 3-phase... (nerdly sigh)

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Richard Hull
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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Richard Hull » Tue Aug 19, 2003 8:39 pm

Warning!!!

Does this supply have a stack?!!! I don't see it in the photos!

How many of you really believe that little PL-259 HV connector in back is gonna give you that 75kv @100 ma?

I gotta a bridge in Brooklyn I can give you a deal on.

Either the seller is truly ignorant of what he has and doesn't know the real HV item is missing or the stack is there and he isn't showing it. The stack is far too STUD an item not to picture! ZOWIE if the stack was shown, but NO he shows its frumpy ole power converter/controller.


Now you will note that he states what is pictured is what he is selling. So you may just be buying the controller!!!!

Too Bad You never know on E-bay. Ignorant stupid sellers coupled with ignorant stupid buyers face off against smart like a fox sellers and con-men sellers, followed by a herd of fleeced lambs who bought from a precisely and cleverly pitched item. Threats and counter threats fly in feedback as the rose tinted glasses come off and the shorn sheep can't get their money back.

When lethal crap like this goes surplus, companies often bust it up so that NO ONE will come back to them with a suit having killed themselves. This fellow may have got the controller and some other surplus dude in Moab Utah has the stack.

The only thing this guy promises in his warranty is that the item pitured is warranted to function. It is probably in perfect operating condition, too. It just needs the other half of its entourage, the real go juice part, the HV multipler stack. Look at the image of the sales sheet.(to the left)

You don't get 75 KV out of the back of a rack!

Where's th' beef!!


Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Richard Hester » Tue Aug 19, 2003 10:35 pm

Maybe, maybe not - I have a 60kV, 1.5ma Spellman supply that uses the butchered UHF connector. I would want to use something besides RG-8 or whatever for the cable, though. It's really all academic, as the supply has a dedicated positive output that would be pretty useless for fusor work. I have a Hipotronics power pack that is much more useful, as the outputs are floating. I also have a mysterious Spellman unit that may be the HV driver for a multiplier stack. There are a couple of banana jacks mounted in a plastic plate on the top. I refuse to even pry off the cover of that monstrosity until way after I finish moving.

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by kbonin » Tue Aug 19, 2003 10:40 pm

FWIW, I checked out this family line on Glassman's website and did a little sanity checking of my own before I posted this, I was wondering the same thing...

The front panel in the picture says "series PK". According to the datasheets, there are 18 open (external) stack models in this series, and 31 fully enclosed rack models. The rack mount models provide up to 125kV, the open stack models provide 150-400kV.

The seller stated "0-75kV", and "reversable". The model PK57R50 seems to match this (0-75kV, 0-50mA), which is a 10.5 high rack mount device. The HV output looks like a PL-259 connector, but from the pics you can see that it is a deep hole. Glassman has custom versions connectors for this, from their site: "The standard Glassman HV connector system used above 6kV employs a deep well tube with a spring-loaded contact. The depth of the connector varies with the voltage level and is designed so that the supply cannot be operated without the mating cable inserted and personnel cannot come in contact with dangerous voltages. We also terminate the shield of the mating cable at the chassis for safety."

So while I certainly agree in principal w/ Richard Hull's post, I'd like to point out that while I have no connection w/ either the eBay seller (if I did they wouldn't be selling it :) or Glassman, this sale did look legitimate, or I certainly wouldn't have posted it here...

Kerry "Due Diligance, or at least Overly Defensive" Bonin :)

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Frank Sanns » Wed Aug 20, 2003 10:49 am

Looks like this week's "Wet Blanket" award goes to Richard.

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Richard Hull » Wed Aug 20, 2003 1:54 pm

I have several of those stacks and HV supplies lying about the lab.

The wet blanket is hopefully a security blanket not just here but for anyone looking at deals on E-bay for really super high voltage systems. It's always, buyer beware.

The super HV controllers usually like to swallow three phase current and then FET or IGBT bridge and oscillate this stuff to a 20khz signal of many amps RF behind it and drive a monster ferrite transformer. This now stepped up, super nasty, but still cable friendly 5-10kv is used to feed the base of an external multiplier stack.

I also have Spellman/glassman 20-40kv supplies where 5ma is the max output (like Richard Hester) and they do indeed put out the full volatge through that little PL-259 with the long snouted, special cable.

BUT 75KV at 60 ma? Maybe they have beefed the thing up a bit. (a big bit) Folks not used to regularly working with such lethal and potent HV, high energy sources often can't see why it is not just a matter of hooking up to a simple output terminal. One little dampness or arc in that little micro tunnel and you would be buying a brand new terminal block, connector and cable.

Large stuff like this item puts out, they normally send to a toroid for field control in air via a stack directly and let the end user figure out how to get the sauce to where they need it.

One last thing. Any one here thinking of bidding on this? Got three phase? Still, it is interesting to see this stuff show up on the same site that sells fiestaware and douche bags.

E-bay is a grand dichotomy. It can be stunningly wonderful or the saddest experience you may even have.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Richard Hester » Wed Aug 20, 2003 8:59 pm

My basic point was that I have a 60kV supply that also uses a modified UHF connector on the outside. More important is the insulation on the cable and the connection made inside a deep well in the power supply case. The UHF connector shell may simply be to hold the cable in place, while the actual ground connection is made to a chassis stud. Traditionally, the shield was stripped back from a length of RG-8 coax, and a banana plug was soldered to the center conductor for the actual HV connection, with the coax braided shield acting as a ground connection, and to help even out the field distribution. A traditional place for the insulation to break down is at the point where the braid is pushed back from the center insulation, because of the concentration of electric field.. An insulating bushing pushed between braid and insulation at this point may help the problem. Voltages such as 60kV may require more robust cable insulation. Rowe Industries and Caton make silicone insulated cables with "dongle" type silicone molded connectors for very high voltage applications. The silicone insulation is much more flexible than the usual large coax or X-ray type cable.

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by ningauble » Thu Aug 21, 2003 8:52 am

Whats a safe voltage for RG-8 ??

Mark Harriss

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Re: Glassman 4kw supply on ebay - if you have 3-phase...

Post by Richard Hester » Thu Aug 21, 2003 6:43 pm

Reynolds Industries has a connector series that they use with RG-8 (or preferrably RG-213) for voltages up tp 25kV. They test the cable assemblies at 28kV. I also found a site that markets a small X-ray system that uses RG-8 for HV interconnects for voltages up to 50kV. I suspect that this is a bit extreme (hot-dogger and daredevil territory), and that a more practical limit is around 30kV or so.

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