Estimating VA rating of toroid

[Christer]

I have a 25-year old toroid which I don't know the VA rating of.
IT is the Transductor brand with a label saying number 6050.
My memory tells me it is a 300VA, but I am definitely not sure
about this. Comparing its physical dimension some modern
toroids of varying brands it matches those of 200 - 225VA.
Intuitively, this seems a reasonable way to determine the
rating, so can I assume it is approx. a 200VA one?

Edit: Hm, guess this one should have gone inte "Electronics
and Parts" instead, but never mind.

 

[peranders]

If the weight is 2.7-3.0 kg it's probely a 300 VA. 300VA from Toroid Transformer(former Transduktor) nowadys weiths 2.55 kg including the metal "rondell" (round disc).

BTW: Christer, isn't this thread a typical "Electronic Parts"?

 

[Christer]

Thanks Per-Anders,
unfortunately I don't have the weight of it since it is mounted in
lab PSU I built some 25 years ago. I am afraid I would not get
this messy thing back into working order if trying to take out
the transformer to weigh it. On the other hand, this PSU has
never been working very well and the reason I want to know
the transformer rating is that I plan to redesign the PSU from
scratch and reuse parts from it.

I didn't know that Toroid is former Transduktor, but now I had
a look at Toroids web page, and indeed they are using the old
Transduktor logo.

 

[peranders]

I didn't know that Toroid is former Transduktor, but now I had
a look at Toroids web page, and indeed they are using the old
Transduktor logo.

Transduktor was the big company, later bought by Ulveco. Ulveco was bought by Toroid Transformer. The logo of Toroid was changed from a "transformer" to the hedgehog logo which Transduktor had.

 

[fdegrove]

TOROID

Hi,

No coloured insulation on the secondaries?

Regards,

 

[peranders]

Yes!

Green-Red, Brown-Blue

 

[Christer]

Re: TOROID

Hi,

No coloured insulation on the secondaries?

Regards,

Yes, but I dont think the colours would tell the VA rating, would
they? Anyway, the secondaries are red-blue and red-green.

 

[fdegrove]

GREAT ANSWER.

Sorry,

No answer on this from me.
The enlightened Sir Anders may be helpfull in this?

ROTMFLAO.

Cheers,😉

 

[peranders]

Christer, to make it easy, compare a modern 300 VA of brand "Toroid Transformer" with the one you have got. The modern one is slightly smaller, not much.

 

[Jocko Homo]

Not exactly what you asked for.....

But better than nothing.

This chart is for stacked lamination transformers. I believe that at one time, we empirically decided that a toroid was good for about 50% more VA capacity.

Jocko

 

[Christer]

Thanks Jocko,

Then the problem is reduced to estimating the size of the
core without having to unwind the transformer. 🙂

Perhaps not of so much help in this case, but certainly a
useful chart for estimating non-toroids where it is easier
to measure the crossection of the core.

 

[Jocko Homo]

You should be able to get a rough idea how much the cross-sectional area is. At least close enough to tell if it is 150 VA, or 330 VA.

Assuming that you don't have one of similar dimensions sitting on your bench.

Jocko