NEED: 6.0uF 1200Vdc capacitor

The P200 would have been a polypropylene film type. That's a fairly ancient one... Plessey, the UK parent company which bought Ducon Australia in 1963, folded in late 1989 and I think GEC Siemens subsequently took them over. Even Siemens has hived off their capacitor manufacturing business.

You haven't said what item of equipment this capacitor is mounted in or what its function might be. Is it on the ac mains side of the circuitry?

If it is on the ac side of things then you could possibly use an ac capacitor of say 280Vac rating such as that made by ASC Capacitors

but until you supply the information this could be an incorrect guess.

If I am correct then the 6.0uF, 280Vac unit shown on this data sheet would be suitable

You will have to locate your local ASC distributor.

Check out Maxwell, also.

They will probably have a suitable replacement.

Didn't figure that info really mattered. I was looking for an exact or equivalent. I realize its old stock; but if it really matters it is out of the main portion of an electric fence circuit board.

and

1200Vdc (see original post) is not exactly high voltage (up to 1500Vdc is still classed as low voltage) so the Maxwell units which start at 9kv are not appropriate.

You have reluctantly now told us that the item containing the capacitor is an electric fence charger but you fail to give any brand or model details. All one can do with what you have provided is to make an intelligent guess.

If I had posted a request that said I wanted a fuel pump for my car in order to repair it, then this would have been quite rightly greeted with derision. The make, model, year etc would be mandatory information to supply in order to get any help and your query is in the same category.

Given the probable age of your fence charger (or the capacitor in question) plus the fact that the manufacturer of that capacitor hasn't been in existence since about 1989 then the likelihood of getting the same unit is highly improbable. The fact that the capacitor is of Australian origin suggests that the fence charger is also Australian made as well, but you haven't provided any details related to the manufacturer. Since Plessey Ducon no longer exists, and the data on this particular capacitor is no longer available, then the more information you provide the better able anyone is to suggest an alternative.

The application to which a capacitor is put is extremely relevant when trying to determine a replacement. The only flexible wire leaded cylindrical polypropylene capacitors made by Plessey Ducon were produced for the power industry for flourescent lighting power factor correction and motor start/run applications, so the unit you are trying to replace is most likely one of those, but just why it is marked with a dc voltage rating is not clear. These capacitors were commonly used in strobe lighting and fence charger applications.

I am guessing that the capacitor is used as the charge storage capacitor which is then dumped periodically into the output transformer of your fence charger. Depending upon the output voltage of the dc-dc converter in the charger, and the turns ratio of the output transformer, we can only make a guess as to the ac voltage rating of a similar capacitor manufactured currently.

Around the mid 80's the Australian standard AS3129 for fence chargers specified that the maximum voltage allowed to be connected to a fence was 5kV into a 1 megohm load, plus other pulse timing and allowable current details. Also, there was only one Australian manufacturer that I am aware of (Jones Transformers model JT349) making an output transformer specifically for fence chargers and this had a ratio of about 1:20(P:S). This allowed for a dc-dc converter having 250Vdc as the output voltage to charge the storage capacitor.

Not having any specific details of your fence charger all I can say is that a circuit design I have to hand with these same specifications and using this output transformer specifies a metallized paper or polypropylene capacitor specified for high current pulse operation, rated at 250Vac - 440Vac and between the values of 6.0 - 25uF. Such capacitors will safely handle dc voltages from 400V and above, which your dc-dc converter is unlikely to produce.

Here is some data on current Australian capacitors similar to the one you are looking for

All you have to do now is find something similar where you are located so surely you are capable of doing that.

There is always one in a group. How about I give you my wife's measurements as well? Geez, I understand about needing all the info on a vehicle but we are talking about a SPECIFIC capacitor here. I gave size restraints as well as the exact values it possesses and even as far as to what item it is in. As to knowing what EXACT manufacturer I am not sure being I am doing this as a favor for a friend. I hate to burst your bubble but you do not know everything being the charger was NOT manufactured in Australia. Ever heard of the word IMPORT. as in importing of goods. Well it happens with electronics as well and apparently some components were imported being it was manufactured in the U.S.A. But I have to admit you are correct in assuming it is an older charger but not old enough to where it is obsolete. Just forget I ever asked, apparently you want to dazzle everyone with your knowledge and rantings on needing an over abundant amount of info. Apparently anyone who knows there stuff doesn't need to know every detail to be able to help being I have had some very useful help from others here who obviously can make a logical conclusion based on SPECIFIC info given.

"Ross Herbert" wrote in message news: snipped-for-privacy@4ax.com...

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It is common courtesy to give as much information as possible to make it easier to provide the CORRECT information. It is not as though I can actually see the item the capacitor is in or what it's function might be. Just saying 6uF, 1200Vdc Plessey Ducon is not enough.

You gave the basic details of the capacitor but as I explained (in a rather verbose manner) IT IS NOT POSSIBLE to give a direct equivalent for it UNLESS THE ORIGINAL DATA IS AVAILABLE. Since this data is not available then a guess has to be made depending upon WHERE in the circuit it is used and WHAT FUNCTION it performs. Because capacitors with the same physical shape and having long flexible wire leads are ALWAYS rated in AC VOLTS by current manufacturers world-wide, the problem is much more complicated than you think. The fact that it had a 1200Vdc rating makes it more difficult because you won't be able to find one of this type anywhere with a DC rating today.

I only said that it SUGGESTS that the item was made in Australia, not that it WAS manufactured in Australia. It seems strange that a country which is overzealous in protecting its own manufacturing industries would allow products made in Australia to be used in a locally made fence charger(I assume it is USA made?), especially when there were many local manufacturers of similar capacitors in the USA at the time the charger was manufactured. My guess is that the fence charger manufacturer bought up a load of NOS which was available after Plessey Ducon folded.

I notice nobody else has tried to help you so that suggests that you haven't been very forthcoming with the required information they need to put in a suggestion.

Completely incorrect. There are literally hundreds of capacitor types many of which can be used only for specific purposes. The function of your capacitor is indeed quite specialised and you can't use just any capacitor. It HAS to be rated for high current pulse duty with an extremely low disssipation factor. You only grudgingly released the information that the item was a fence charger but not WHICH PART of the circuit it is in, so in order to suggest the correct replacement, specialised knowledge was required to GUESS that the capacitor was used to provide high current dc pulses to the primary of a pulse transformer. Since you won't be able to buy the capacitor type you want with a DC voltage rating anywhere today, then how would you suggest anyone would be able to help find a replacement?

You are an ungrateful sod aren't you. I have correctly given you all the information you need after having to prise the barest necessary information out of you with a stick. I just can't give you a specific make and model other than I have done already because I don't know what is available where you are.

Apart from the single response from tlbs I can't see that anyone other than me has responded using this newsgroup. If they have contacted you direct via email then so how could I know what "useful help" you have been given or whether it is correct or not?