RE: Why no corona? AC / DC transmission lines

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Original poster: "Mccauley, Daniel H by way of Terry Fritz <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>


Sure, there are transmission lines that run up to 768kV or better. 
I've even heard of megavolt lines (anyone know where these are?)

>>>>>>They have quite a few now 1 Megavolt DC transmission lines which are
basically bipole
transmission lines (+/- 500,000VDC).  Seems Edison could be happy right now.
DC high voltage lines are run
because of their lower reactive losses and are under a lot of study right
now.
I think i heard before that over 30% of power is lost in AC high voltage
power lines just due to losses.  Of course in DC transmission lines you do
get a large amount of losses in the step-up / step-down converter systems.


 that run 
across deserts. But the vast majority of power lines are small, under 
14.4kV. Also, while we run at 400kV regularly, their 400kV would act a lot 
differently. Even though the voltage is the same, the frequency is a lot 
different. And weather it's a megavolt line across a desert, or the 120 in 
your wall outlet, it's ALL at 60hz. Things get freaky with frequency.

>>>>>>>>Not really, DC tranmission lines exist and they have just as much
corona as 60Hz lines.

Dan





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>Original poster: "Richard W. by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><potluck-at-xmission-dot-com>
>
>Hi list,
>Was wondering.
>Power transmission lines, before a substation, can carry from 100Kv to more

>the
>600Kv. So why no corona? Seems we battle corona quite a bit at much lower
>voltages. <shrugs>
>
>Rick W.
>Salt Lake