oil capacitor

An oil filled paper capacitor does not care about polarity, so its non-polarised.

They are an old fashioned technology and were used extensively in valve amplifiers at high voltages with capacitance up to 20 micro Farads.

So the answer to your questions is no they are not polarised and yes they are safe to use in high voltage amplifiers - but check the voltage rating.

John.

Don't they also have the ability to drop their charge rather fast, and are often used in strobe and tesla coil applications?

so its non-polarised

But some makers used to mark "Ground side " because of nearness to Can of outer electrode.

FROM : MIT-Iran co
To : cr4
Subject: to please an order
Dear sales manager,
Our company MIT-Iran is the producer of induction furnace under license and through a joint venture with Mit of Australia please would you advise us the possibility of producing oil capacitor in your company.
Following you can find the related table:
HIGH FREQUENCY AC OIL CAPACITOR


CAPACITY FREQUENCY AMP KVAR VOLT
Fµ 767 HZ 2545 A 8400 3300 VAC
Fµ 1200 HZ 1131 A 3393 3000 VAC
Fµ 1200 HZ 68 A 204 3000 VAC

HIGH FREQUENCY DC OIL CAPACITOR

CAPACITY T.V AMP W.V
2456.3 µF 1800 VDC 1750 A 1200 VDC

We would like to place an order on this soon, so we would appreciate an early reply.
Best regards,

H. Ghorbani

Phone No: +98 121 2203543
Fax : : +98 121 2203544
Email : info@mit-iran.com
mitiran@yahoo.com

CR4 is not a company, its a Blog.......! You cannot buy or even order from us.....we are only figments of your imagination.......we exist only to exist!!!....in your mind!!

Oh..... does that mean I'm not really here then?

I am just a figment of my imagination, or is it someone else's imagination that I'm here?

John?

EXACTLY!!!!!

Worried?

Anyone with an avatar that cool must exist! It's a dead giveaway that you are the source of Intelligent Design of your web persona! QED

If old, could it possibly be filled with highly carcinogenic PCB oil? They were in use up to the early 1980s before being banned in most counties (I believe! Its all from memory) I would not have one in my house.....

Would it not be better to buy and install something more modern and at least "More safe"?

Also, is this not more likely to have a fault later.....like giving the family cancer?

Hey! I only just about understood the question.... I've no idea what he / she wants the information for... it may just be for a hypothetical application....

John

I think he want to re-use old oil filled capacitors.........nothing more nothing less.

It could be highly dangerous for him, his family and the environment.

We cannot take chances that it is only a thinking exercise.....I agree that it is possible, but his English is rather limited.....wait up!

I am surprised by some of the response to this question. Oil filled capacitors are in general use today, and if you own a washing machine , drier, refrigerator, or central air conditioner I will bet you have one in your home.

http://my.execpc.com/~endlr/oil_filled.html

Be careful how you mount your hobby horse.

I am extremely careful in how I mount anything.....anyone with real Balls learns quickly....!

The reason that I am more than slightly alarmed is quite simple for most people who have worked in the electronics industry for more than 20 years, that before the early 80s, I am given to believe that PCB was the preferred oil for almost all of these components, so if the caps are old, my information would lead me therefore to believe that there is a better than even chance that they contain this carcinogenic oil....

Should I just let him poison himself and the environment without saying a word? I think not.

Early caps were not even labeled "Contains PCB" I am told by a friend of mine with far more experience than I in this area.....from the 1930s onwards!!!

Or can you offer us all a better method of "handling" this possible situation....if yes, let us hear your ideas as I am always willing to learn from a professional, or laugh at the rest!!! What are you?

Before that, may I draw your attention to the following from this link:-

http://www.cqs.com/pcb.htm

Here is an excerpt!!! my underlining for your benefit:- (but read the whole page!)

PCBs: These Supertoxins are Everywhere

PCBs - PolyChlorinated Biphenyls - were manufactured by a one company - Monsanto Chemical - starting in the 1930s. They were promoted as a nearly indestructible replacement for hydraulic oil, pump oil, and the oil bath for electrical transformers and capacitors. It was known even in the 1930s, when production began, that they were extremely toxic. Exposed workers began showing signs of toxic exposure almost immediately.

A lot of the environmental activism centered around the PCB toxicity and it's impact on the health of workers is questionable, just like so many other regulations that the USEPA passed on to industry. It is similar to the issues raised about regulations concerning toxicity of Arsenic in drinking water, where the WHO passed a guideline based on review of some data from Bangladesh and Taiwan and gave a guideline of 10 ppb maximum. The USEPA passed the guideline into law and now more recently the NIH has studied the same data as the WHO and reported that the data statistics only support a maximum standard of ~150 ppb. It is all fear-mongering by people that want to limit our freedoms.

.............Or to stop poisoning you, but in your case it may be too late anyway, so who cares!!

Erring on the side of less rather more, appears to me to be the right way to be wrong!!!

Puns intended!!

The reason for lowering the amount of arsenic in water was due to the findings that while not directly toxic, small amounts of arsenic interfere with one of the most important DNA replicating controls. This increases the cancer risk considerably.

And it was the NIH, guided by "Baby Bush," that said it was too strict. When in fact, the issue was it might make water more expensive.

Here is my 2 minute tour of oil filled capacitors (and transformers). Prior to the 1930s, when these electrical devices that were filled with mineral oil, exploded, it was like napalm. Many people were seriously burned or killed by these flame throwers. In the 1930s it was learned that PCB additives acted as a fire retardant. PCB additives were mandated by law until it was later dicovered that PCBs also had some down sides. Now they are forbidden. New oil filled components are PCB free. Older ones may or may not contain PCBs. Oil filled components are not obsolete. Oil filled capacitors are used in many high power devices such as lasers, rail guns, etc. So, now you are now free to re-live the exciting explosions of yesteryear, but you won't get cancer from these components.

A typical use for oil filled caps. As you see the caps. shift the phase of the AC power they transmit.

I can appreciate your fears about PCB filled caps., but it has been many years since they were manufactured and you are not likely to find one even on the surplus market. I have worked in the field of electronics all of my working life starting with part time a TV repair job after school and Saturdays in 1952 when I was in the 10th grade. I was taught early how to safely clean up an instrument with a leaky cap. I believe all people working in the industry need to learn how to safely handle hazardous materials.

If you know personally the person who asked the initial question and can vouch for him, otherwise your point was......????

Thanks to all

Yes I found a lot of this oil filled capacitor in surplus market

I'm planning to build a vhf amplifier using a 4cx1500 tube for EME

Earth Moon Earth communication.

Thinking of using this capacitor after I saw a lot of friend used it

in their home-brew amplifiers see this links for a nice HT psu

http://www.dg2kbc.de/gs35.html

For me these caps are

So cheep –at least here

Has a Big charging capacity

Old but not use at all.

I got also a lot of old transistor and different kind of power tubes I notice most of it

With a warning a bout the beryllium

So how I can deal with this component? (a treasure to me and no easy alternative ) and avoid the dangerous of PCB and the beryllium toxicity.

Thank and 73 de

leoan

Hi Guest, not sure where you are located....

But like everything that has a risk attached to it, be it PCBs or beryllium, if you handle them as intended and use them as intended then you shouldn't have any problem...

Beryllium is used in most high power semiconductors, especially rf as it has a high thermal coefficient, it is a hard ceramic like material and there's no problem if you don't cut the transistor open or file / grind it...

Similarly with the oil filled capacitor it may or maynot contain PCB oil but if you use it with in its rating it should be fine... Might be a good idea to put a warning sign on the power amplifier though, in case of a problem years from now and especially upon disposal...

Good luck! John.

Your comments are completely valid, thanks.

thank Electroman and thanks to all friends

my qth is africa

see u soon 73 de leaon