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Re: More Tuning/Debugging



> From: Jim Fosse <jim.fosse-at-bdt-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: More Tuning/Debugging
> 
> [snip]
> >>> However, given Richards 1.5 second delay factor, I would look for an
> >>> interaction between the PFC caps and the ballast and variac also.
> >>> Try removing most of your PFC caps and see if there is a significant
> >>> change in the time constant or behavior of the system. Don't remove
> >>> all of the PFCs because they prevent the voltage spikes from the
> >>> ballast from blowing your RFI filters and home electronics.
> >>> 
> Richard,
> 	I had a stray thought/trivia pop into my mind whilst't stuck
> in traffic this morning. I seem to recall (can't place the reference,
> or thread;(    ) that some of the large distribution transformers have
> automatic variable taps to compensate for load induced voltage drops.
> If this is so??, Could you be triggering this mechanism in your "pad
> elephant"?
> 
> All,
> 	Can anyone confirm or deny the existence of a voltage
> regulator mechanism in large distribution transformers?
> 
> 	jim

They do exist, but not in distribution transformers.  They are found in substations  
that step the voltage from subtransmission voltages down to distribution voltages.   
The transformers that I work with on the job are 69kv / 12.47kv units rated at 25  
MVA.  These have automatic tap changers, but I've never seen a distribution xformer  
with such.

-Mike McCarty