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Re: [TCML] ABB High Voltage Instrument Transformer Transformer 120V to 12000V



I concur with JJ. These are instrument duty transformers and are necessarily massively over designed for complete voltage stability to measure a precise fraction of a primary power distribution voltage. This allows reasonably accurate measurement of thousands of volts with only a 120 volt potential at the metering device. As can be seen, the drawback is the usual cost vs. the volt-amp rating, even though they can be pushed  beyond their nameplate rating by several times for the short duty cycles of Tesla coil application. A 10 or 15 kVa pole distribution transformer (aka -pole pig) in the same voltage range would probably prove more economical, if you can arrange reasonable freight shipment, as these typically weigh in the 200-300 lb. range. Finding one locally would basically eliminate the cost of shipment.

David

Sent from my iPhone

> On Dec 17, 2015, at 3:44 PM, JJ Dasher via Tesla <tesla@xxxxxxxxxx> wrote:
> 
> I have a couple of smaller instrument transformers, and they are beasts.  I doubt those are current limited.  They probably are grossly underrated for continuous duty @ 750va.  They can likely be pushed much, much further for short periods of time.
> -JJ
> 
> 
>      From: Miles Mauldin <teslamiles@xxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
> Sent: Thursday, December 17, 2015 9:50 AM
> Subject: Re: [TCML] ABB High Voltage Instrument Transformer Transformer 120V to 12000V
> 
> Am I reading that right? 62.5ma
> An NST rated at the same power is half the weight and a third the cost. 
> What's the benefit that's worth that much difference?
> 
> Cheers!
> Miles
> Sent from my iPhone
> 
>> On Dec 16, 2015, at 3:52 PM, David Speck <Dave@xxxxxxxxxxxxxxxx> wrote:
>> 
>> Mike,
>> 
>> Label says thermal rating of 750 watts.  At 105# each, they are beefy transformers.
>> 
>> Dave
>> 
>>> On 12/15/2015 9:35 PM, Peggy Day wrote:
>>> Greetings All,
>>> 
>>> I wonder what the current or power rating is on these ABB High Voltage Instrument Transformer Transformers?  They are good for 120V to 12000V.
>>> 
>>> http://www.ebay.com/itm/NEW-Tesla-Neon-Transformer-120-Volt-to-12-000-Volt-or-12-000V-to-120V-100-1-Coil-/191116989166?hash=item2c7f75d2ee:g:4y4AAOxydB1SeZOu
>>> 
>>> Model/Style Number: 7883A12G07
>>> 
>>> Does anyone know?
>>> 
>>> They look like they might be fun for someone.
>>> 
>>> Thanks,
>>> 
>>> Mike
>> 
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