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Modular-based large DRSSTC

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LAN_403

zrg

Wed Jul 30 2014, 11:31PM

Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93

Hi everyone.
Our team has been working on this project about a month or two (mainly lazily searching for a water jet cutting service to slice the fiberglass 15mm thick sheet).

This is a regular type DRSSTC, designed to produce 5-6 meters of spark, quite similar to Phillip Slawinski's DRSSTC VI by size. However, having some desire to make it easy to assemble and disassemble for moving the whole thing around, we thought that it would be nice to make it modular: MMC module, bridge module, driver&automation module. All modules are connected with each other by power and/or signal cables and can be easily changed to some other modules (larger MMC, bridge with other bricks, etc) that would fit in this coil.

Total height: about 280-300 cm.
Secondary: 180x31.5 cm, 1.1 mm wire.
Topload: 180x31.5 cm, will be replaced to proper aluminum tubing soon.
Fsec: 35 kHz
Primary: 7/8" copper tubing, air cooled. Stays cool however.
MMC: custom made Russian power film caps, 220nf 20kV each, 5 pcs total. Cost about 82$ per cap.
Power bridge: 2x CM600DU-24NF, 6x CDE 12000@450V caps, 18000uf total.
Power input: 3p 380V, probably something around 20-30 kW.
Driver: Steve-based (well, there aren't much non-Steve based DRSSTC drivers nowadays, are there) custom driver.
OCD set to 4000A.

First post: coil model and power bridge.

zrg

Wed Jul 30 2014, 11:37PM

Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93

Second post: primary and secondary.

Other pieces will be shown a bit later, tomorrow or something like that :)

Mads Barnkob

Thu Jul 31 2014, 10:22AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

This coil looks good, all the waterjetted parts are really nice and makes me wonder wether to look for that option in the future, is it expensive to get such jobs done or do you know someone that can do it for you cheap?

My own large DRSSTC is also made modular into bottom box module with bridge and mmc, upper platform with primary coil, secondary coil and topload, 4 parts that are easily taken apart with a total of 3 screws and locking mechanism.

Steve Conner

Thu Jul 31 2014, 01:43PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

The modular approach also worked well for me with Odin. When I discovered that I'd made the tank capacitor far too big, it was easy to swap in a smaller one. Later I hope to reuse the original tank cap and swap in a bigger bridge. Obviously it would have been better to get it right from the start, but whatever...

Another handy feature was the ability to take the resonator off the top of the electronics box and stand it to one side. It gives some more sparking room in indoor venues with low ceilings.

Linas

Thu Jul 31 2014, 06:15PM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

Steve Conner wrote ...

The modular approach also worked well for me with Odin. When I discovered that I'd made the tank capacitor far too big, it was easy to swap in a smaller one. Later I hope to reuse the original tank cap and swap in a bigger bridge. Obviously it would have been better to get it right from the start, but whatever...

Another handy feature was the ability to take the resonator off the top of the electronics box and stand it to one side. It gives some more sparking room in indoor venues with low ceilings.

I have same size coil as you, and right now reworking my MMC, and i can make 0,5 0,65 or 0,8uF tank capacitor. What should i use ? (full bridge from CM600)

zrg

Thu Jul 31 2014, 06:20PM

Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93

MMC, primary support (18 mm thick plywood) and control box.

Steve Conner

Thu Jul 31 2014, 09:46PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I see some sort of blurred-out secret circuit board... 8)

On a more serious note, what is the point of putting the key switch and circuit breaker right in the bottom of the coil? You are going to have to walk up to the coil, throw that breaker, turn the key, and hope that the coil doesn't start firing for some reason. And if it starts to malfunction, you have to walk up to it to shut it down.

Linas, what is the frequency of the system you're planning?

zrg

Thu Jul 31 2014, 10:03PM

Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93

For all DRs we've built so far, none of them ever tried to start without control signal on the optics input. So far that box position seems reasonable enough. However, that circuit breaker is used mainly as a power switch; there is another one in the middle of the power cable, which can be used to power on and off the whole coil if needed.

Steve Conner

Thu Jul 31 2014, 10:23PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I thought about this for a while and ended up getting rid of everything except that breaker in the middle of the power cable.

The key switch might be good to prevent unauthorised use of the coil by other people, I guess.

Linas

Fri Aug 01 2014, 10:29AM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

zrg wrote ...

why driver electronics intentionally have blur added ? what you don't want us to see ? (top right corner)

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