[TCML] Yet another NST Depotting Topic

[bartb]

It will always give a higher current with shunts removed. The more 
removed, the higher the current. But, when it really starts to climb 
high, it's too many removed. You'll probably be ok at 120mA.

Take care,
Bart

Phillip Slawinski wrote:
> I've removed enough shunts to get 120mA.  I wonder though if I should be
> running slightly under that because when it's used in the TC it will give a
> higher current.  Oh well, with my luck that won't even be a problem.  This
> NST is doomed to failure within five minutes of operation with the coil :(
>
> On Tue, Jul 8, 2008 at 7:51 PM, bartb <bartb at classictesla.com> wrote:
>
>   
>> Hi Phillip,
>>
>> As I mentioned to someone else recently with the same size NST and
>> depotting situation. I personally would not go over 100mA output. The main
>> thing is to be able to run full voltage without running into core
>> saturation. If you remove too many shunts, then core saturation will occur
>> at lower output voltages which is the last thing you want.
>>
>> Test it. Remove about 1/2 the shunts then dry test and measure the output
>> current in a shorted output test. Also measure the input current in the same
>> test to ensure it doesn't climb too high at full voltage input. If you want
>> to run it right to the edge, then you will have to remove a few shunts at a
>> time and redo measurements. Find out where saturation occurs at full
>> voltage, then back to give your self some margin by reinstalling some
>> shunts.
>>
>> Also, "if" you are going to run it at the edge of core saturation and the
>> core gets really hot really fast, then you should choose oil to help heat
>> dissipation.
>>
>> Take care,
>> Bart
>>
>>
>> Phillip Slawinski wrote:
>>
>>     
>>> As previously stated, I have a step up transformer.  I'm wondering how
>>> much
>>> current I can get out of the 15/30 without it having a melt down after 5
>>> minutes of continuous operation.
>>>
>>> On Tue, Jul 8, 2008 at 12:26 PM, Jim Mora <wavetuner at gmail.com> wrote:
>>>
>>>
>>>
>>>       
>>>> Da, that would double the output voltage by doubling the turns ratio.
>>>> Jim
>>>>
>>>> -----Original Message-----
>>>> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
>>>> Behalf
>>>> Of Lau, Gary
>>>> Sent: Tuesday, July 08, 2008 7:08 AM
>>>> To: Tesla Coil Mailing List
>>>> Subject: RE: [TCML] Yet another NST Depotting Topic
>>>>
>>>> The 277V primary voltage makes this a less than ideal unit to invest in;
>>>> are
>>>> you sure it's worth the effort?
>>>>
>>>> Regards, Gary Lau
>>>> MA, USA
>>>>
>>>>
>>>>
>>>>         
>>>>> -----Original Message-----
>>>>> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
>>>>> Behalf Of Phillip Slawinski
>>>>> Sent: Tuesday, July 08, 2008 12:14 AM
>>>>> To: Tesla Coil Mailing List
>>>>> Subject: [TCML] Yet another NST Depotting Topic
>>>>>
>>>>> Those of you who have been following my topics so far will not be
>>>>>
>>>>>
>>>>>           
>>>> surprised
>>>>
>>>>
>>>>         
>>>>> to hear that I have depotted yet another NST.  With five NSTs under my
>>>>>
>>>>>
>>>>>           
>>>> belt
>>>>
>>>>
>>>>         
>>>>> I can confidently say that I've got this down to a science.  I can knock
>>>>>
>>>>>
>>>>>           
>>>> one
>>>>
>>>>
>>>>         
>>>>> out in just a few hours with little mess.
>>>>>
>>>>> The transformer I just depotted is a a 277V 15/30 Franceformer.  Does
>>>>>
>>>>>
>>>>>           
>>>> anyone
>>>>
>>>>
>>>>         
>>>>> have an opinion on what the most current I can pull out of this is?
>>>>>  I'll
>>>>>
>>>>>
>>>>>           
>>>> be
>>>>
>>>>
>>>>         
>>>>> putting it under oil or potting it in wax, I haven't decided yet.
>>>>>
>>>>>
>>>>>           
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>>>>
>>>>
>>>>         
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>>>
>>>       
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