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Old 18th November 2006, 12:47 PM   #1
K-amps is offline K-amps  United States
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Default Whats wrong with the picture?


I tend to give people the benefit of doubt, but you guys tell me if I was duped into buying a Toroid I thought was a 2kVA Part.

It is pictured here in the middle next to 3 different 1 kVA toroids that I already own and know they are 1 kVA. The one on the left is a Plitron, the top one is Antek and the large one on the bottom is a Hammond.

While I know "size aint everything".... I cannot get over the thought that this no name part cannot be 2kVA .

(PS: I will not disclose the DIY member who sold it to me for he may come clean on his own...)

Best,
K-Dupee
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Old 18th November 2006, 12:58 PM   #2
K-amps is offline K-amps  United States
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To be fair, the supposed 2kVA part is slightly taller than the Plitron and the Hammond Toroid but about the same as the Antek...

As far as mass goes...

Antek 1kVA : 15.0 lbs
Plitron 1kVA : 15.5 lbs
Hammond 1kva : 23.0 lbs

2kva "supposed" 14.5 lbs....
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Old 18th November 2006, 01:13 PM   #3
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K,

could be in good faith, half of the population here can't recognise their own dickcheney if it was electronic.

I've got a couple of 1kW Plitrons, and find them pretty sizy compared to most other brands.
Got some biggies in the 1.8 to 2kW range from other toroid manufacturers, some are not much bigger than the Plitrons overall but each one easily outweighs them.
If your 2kWatter weighs less than the 1kW Canadian, you've been conned imo.
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Old 18th November 2006, 01:29 PM   #4
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Yeah,

Hammond transformers makes you vision chunky Canadian dames in lumber shirts that offer the option of armwrestling you under the table or the stretched embarassment of the same by outdrinking you. (i hate to see Ozzy toroids, and i stopped JB shots contests with women)
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Old 18th November 2006, 05:54 PM   #5
lineup is offline lineup  Sweden
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Quote:
Originally posted by K-amps

As far as mass goes...

Antek 1kVA : 15.0 lbs
Plitron 1kVA : 15.5 lbs
Hammond 1kva : 23.0 lbs

2kva "supposed" 14.5 lbs....

Even if weight is not everything ( wires matters, too )
when it comes to toroid transformers:

Weight DOES NOT LIE


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Old 18th November 2006, 05:56 PM   #6
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Tell me about it, i'm at least a 16kVA Donut.
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Old 18th November 2006, 05:58 PM   #7
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Hi,

Harbuch Antrim 2kVA toriods are 17kg. Unfortunately I don't know what lbs are anymore but they used to be a lot smaller than kg.

http://ourworld.compuserve.com/homep...ch/harbuch.htm

regards
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Old 18th November 2006, 06:14 PM   #8
lineup is offline lineup  Sweden
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Quote:
Originally posted by Greg Erskine

Harbuch Antrim 2kVA toriods are 17kg. Unfortunately I don't know what lbs are anymore but they used to be a lot smaller than kg.

http://ourworld.compuserve.com/homep...ch/harbuch.htm
What I recall (not sure):
1 lbs = 0.45 kg
1 kg = 2.2 lbs

17 kg should then be ~37 lbs
( compare to those 1 kVA ~15 lbs )


------------------------------
edit:
found a link about metrics, and
With online conversion service
http://www.curezone.com/conversions.asp


Quote:
16 oz. = (1 lbs.) 453.5 g = 0.453 Kg
1 oz. = 30 g 1 lbs. = 16 oz. (453.5 g)
1 g = 0.35 oz. 1 kg = 2.2 lbs. = 1000 g
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Old 18th November 2006, 08:11 PM   #9
lineup is offline lineup  Sweden
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Default Toroid Tranformer Weight VA rating formula

.

I looked up several Toroid Transformer manufacturers data.

Based on VA ratings / weight data we make up some rough formulas.
I think most makers of transformers use a core material
with almost the same quality.
There are always exceptions, but for the major public main stream market, to affordable prices,
I would say there are only small differences.

Say max +-15 % in VA per core weight.

######################################

Here is my attempt to make such rule of the thumb formulas.

The Toroid Transformer data I used comes in 15 - 4000 VA
and looks like this:
Click the image to open in full size.

Approximate formulas.
Quote:
0.6 - 4.5 kg (30 -> 400 VA)
VA = 100 (kg - k) where k= 0.3 -> 0.5

5 - 8.5 kg (500 - 800 VA)
VA = 100 x kg

> 9 kg (1000 - 4000 VA)
1000VA 09.5 kg, 20.9 lbs
2000VA 15.6 kg, 34.3 lbs
3000VA 22.3 kg, 49.0 lbs
4000VA 31.5 kg, 69.3 lbs
Example:
A toroid weighs 1.9 kg. Set k=0.4
VA = 100(1.9-0.4) = 100x1.5
= 150 VA
.................................................. ................................



Web Reference used:
Shenzhen Okerda Science & Technology Co., Ltd
is a manufacturer specializing in custom designed transformers, coils, and power supplies.

OKERDA HEAD OFFICE (SHENZHEN)
Shenzhen City, Guangdong Province 518110, P.R.China

British Office:
Mr. Hao
Tel: 0044—2089856157, Cell phone: 07830113768
Address: 80B, Coopersale Road, Homerton, Hackney, London, UK E9 6BA

http://www.okerda-tech.com/
.................................................. ...................................


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Audio Mains Transformers Division
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Old 18th November 2006, 08:36 PM   #10
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This is a 4KVA transformer I am using for my prototype 2kw GND Bridge amplifier.

There is no way that transformer is 2kva
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