capacitor?????

[alkv23]

i have 8 units of capacitor but im not sure on this capacitor. Need some info about this capacitor. Hope ur reply will good info to me. Below i give more details regarding this capacitor.

sprague the brand
20.0uf +/- 10&
200dc
735p

plz help me. Give me more detail.Thanks

 

[Staigen1]

Hi there alkv23

Well, what is it moore to say? The cap is a 20 uF capacitor, probably a El-lyt, but not necessarily so. Any sign of positive or negative connections? Red and/or black connection markings? Red and black conecting wires? Without a pic it's almost impossible to tell moore!
I belive you made a typo error
20.0uf +/- 10&<--
Should be % instead

//Staigen

 

[alkv23]

hi Mr staigen i had attach capacitor pix. Hope it will be more easy to tell about it.Thanks

View attachment 37585

 

[Staigen1]

Hi there

Its still hard to tell if it is a electrolytic cap! Can you upload a pair of pics, taken from the ends of the cap, then maybee it's easier to tell. But, sure, it's a 20 uF 200V capacitor!

//Staigen

 

[alkv23]

Im also not very sure about this capacitor. Some people said its electrolytic capacitor but not confirm it. This capacitor use for high voltage power supply. The supply around 120kv. This use for electro beam welder machine. I got attach more pix and waiting for ur reply. Thanks.

View attachment 37611

View attachment 37612

 

[Staigen1]

Hi there

Ok, i'm waiting!

//Staigen

 

[audioguru2]

I think it is paper and foil. The paper is inpregnated in wax or oil. See, I am a poet! ;D

 

[Staigen1]

Yeah, i think so too, but i will(want to?) see the other end before i say that! and also what the yellowish compound is made of!

//Staigen

 

[audioguru2]

Yellow epoxy.

 

[Staigen1]

Yepp, i belive so too, but i want to see it in the other end first!

I think it is paper and foil. The paper is inpregnated in wax or oil

Maybee, but dont you think it is metallished paper or even metallished polysomething? Polyester? Polycarbonate? Poly???
If it is filled with epoxy in the other end than i will say it is something like that!

But the welder, about 120 KiloVolt, sounds dangerous! I belive the boy dont know what he is talking about!

//Staigen

 

[alkv23]

mr staigen i know wht im said. Its true that this capacitor using for 120kv. Its very high voltage and dengerous. The machine name is Electro Beam Welder and the part that capacitor contain is SR6. Made in England and were have 4 unit of SR6 here. The current also very high. We using 4 unit of step up transformers. If any small mistake in the operation it can kill.

 

[Staigen1]

Ok, 120 KiloVolts. At how many Amps?

//Staigen

 

[audioguru2]

Eight of these 200V caps in series makes 1600V. Maybe only (!) 1500V is used to power an inverter at the primary of a stepup transformer producing 120kV for a CO2 laser or some other kind of beam maker.
These caps carry a very high current. Look at the size of them and the size of the metal beam joining them.

 

[Staigen1]

Yeah, i saw that! A laser, that explain things a bit for me! ;D ;D
Sorry

//Staigen

 

[audioguru2]

Maybe this cap is made by Sprague-Barre (SB) Electronics:

View attachment 37613

 

[Staigen1]

Oh, thats the way it is spelled, metallized

//Staigen

 

[alkv23]

Im not very sure about the amp but around 20a~30a. The capacitor use for what and why need to use this type of capacitor. Plz answer me this question>
Thanks

 

[audioguru2]

The caps are wired in series to give a very high voltage rating. Therefore they must be this extremely low leakage current type.
The caps must supply very high current pulses. Therefore they must be this very low ESR type.

 

[Alun]

Connecting capacitors in serie may increase the voltage rating but it also increases the ESR and inductance.