Re: Arc Welders as Rheostats??

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "torlin by way of Terry Fritz <twftesla-at-qwest-dot-net>" <torlin-at-ghostmail-dot-net>

Thank you so much, Godfrey.  It did help me alot.  I was 
getting it confused, since I was hooking it up backwards. 
 This is my first attempt at a pole pig, instead of my old 
Fuel Oil Ignition system.  



On Tue, 26 Mar 2002 07:38:08 -0700
  "Tesla list" <tesla-at-pupman-dot-com> wrote:
>Original poster: "Loudner, Godfrey by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
>
>
>
>> -----Original Message-----
>> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
>> Sent:	Sunday, March 24, 2002 11:13 PM
>> To:	tesla-at-pupman-dot-com
>> Subject:	Re: Arc Welders as Rheostats??
>> 
>> Hi Chris
>> 
>> Since the e-mail I sent you keeps bouncing back as 
>>undeliverable, I'll
>> have to answer your questions on list.
>> 
>> For power companies, the primary is the 13,200 volt side 
>>(high side) and
>> the secondary is the 120/240 volt side (low side). For 
>>tesla coilers, its
>> just the opposite. 
>> 
>> The kVA of your pole pig is the amount of power the 
>>transformer can handle
>> continuously without over heating. Since pole pigs are 
>>overbuilt, your
>> transformer can handle more than 25 kVA for short 
>>periods of time. Power
>> is the amount of energy that is produced or consumed per 
>>unit of time.
>> Power = Voltage x Current. Power, voltage, and current 
>>are measured in
>> watts, volts, and amperes respectively. 25 kVA = 25,000 
>>watts. Here k
>> stands for 1000 and VA = volt x ampere = watt. Then 
>>Current = Power /
>> Voltage. If 240 volts is applied to the low side and the 
>>pole pig is
>> processing 25 kVA of power, the current on the low is is 
>>(25,000 / 240)
>> amperes = 104 amperes. Also the current on the high side 
>>is (25,000 /
>> 13,200) amperes = 1.9 amperes. A milliampere (mA) is 
>>1/000 of an ampere.
>> So  1.9 amperes = 1900 mA. A big neon sign transformer 
>>(NST) is rated at
>> 60 mA. Currentwise, the possible 1900 mA output of your 
>>pole pig is
>> equivalent to the combined current output of 1900 / 60 = 
>>about 32 of the
>> big NSTs. The above accounrt of kVA can be made more 
>>technical (inductance
>> and complex numbers), but I think this is good enough 
>>for someone who
>> wants to build a pole pig system. I hope this will clear 
>>up your math.
>> problems. 
>> 
>> The short circuit current (low or high side) of your 
>>polr pig would be
>> very high. This can be determined, assuming an infinite 
>>source of
>> generated power, from the impedance of the transformer 
>>which is listed on
>> the rating plate. But this is a useless calculation for 
>>tesla coilers.
>> Power companies need to know this so they can determine 
>>breaker or fuse
>> ratings. 
>> 
>> Godfrey Loudner   
>> 
>> 
>> 
>> 
>
>
>

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