[Pubtech] ME piece on Lower Voltages [RE-wrenches]

[William Miller]

Pals:

Here is another thread from the same group.  It refers to the plan to lower
grid voltage to save power.  I hope the information is useful or at least
entertaining.

William





>Date: Wed, 25 Jul 2001 07:59:25 -0500
>From: "Chris Scott" <Chris.Scott at wku.edu>
>Subject: Re: [Pubtech]  ME piece on Lower Voltages
>To: PUBtech Public Radio Tech Talk <pubtech at lists.wduq.org>
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>
>As per usual, Ira provides an accurate summary of the facts.
>
>Thanks Ira.
>
>Chris Scott
>Western Kentucky University
>
>
>
>"Ira A. Wilner" wrote:
>> 
>> Remember,  for resistive loads, reducing E will reduce I and also W.  Thus
>> incandescent lighting, resistance heaters and even some electric motors
>> will draw a bit less current.  But you are right to argue that regulated
>> devices, i.e. electronic power supplies and broadcast transmitters with APC
>> controllers will attempt to use the same amount of power as always.  Thus,
>> I will rise when E falls to compensate.
>> 
>> But the net result for the power grid is a reduction in energy demand when
>> the voltage is reduced.  After all that is what brownouts are all about!
>> You reduce the voltage on the grid to reduce the load demand on your
>> generation capacity.  Else your spinning generators will slow down for lack
>> of input energy reserves.  And you do not want to significantly reduce your
>> frequency in a 60 Hz system.  Lowering the voltage reduces the load on the
>> generators and enables them to keep on spinning at 60Hz.  In effect, power
>> line voltage regulators and the exciters in generators act as impedance
>> converters to load down or unload the spinning energy sources.
>> 
>> Also, if you regulate your local voltage down, it will cause energy
>> (current) to flow towards you on the grid from other sources than your own.
>> :-)
>> 
>> --Ira
>> 
>> -----Original Message-----
>> From: John Huntley <JHuntley at nhpr.org>
>> To: 'PUBtech Public Radio Tech Talk' <pubtech at lists.wduq.org>
>> Date: Tuesday, July 24, 2001 10:07 AM
>> Subject: RE: [Pubtech] ME piece on Lower Voltages
>> 
>> >SO?!?
>> >
>> >California in not the only place to attempt to negate the laws of physics
>> or
>> >economics through  legislation!   How many other states have "Utility
>> >De-regulation"?
>> >
>> >I have Parents, Siblings and adult children living in California.
>> >
>> >I'm STILL curious about the physics of what is being proposed.
>> 
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__________________________________________________________________
William Miller
SLO Communications: Communications and Power Systems Consulting
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