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High Voltage DC..

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High Voltage DC..

Post by colly0410 » Wed Apr 20, 2016 10:37 pm

Been reading up about HV DC lines that run at up to 500Kv around the world, finding the subject fascinating. Interesting how some of them use the earth as a return path. (Single Wire Earth Return)

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Re: High Voltage DC..

Post by Kalee20 » Thu Apr 21, 2016 3:17 pm

Wow! Imagine a 500kV DC arc starting and maintaining!

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Re: High Voltage DC..

Post by Cathovisor » Thu Apr 21, 2016 5:55 pm

Kalee20 wrote:Wow! Imagine a 500kV DC arc starting and maintaining!

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Re: High Voltage DC..

Post by turretslug » Thu Apr 21, 2016 6:05 pm

Does a guy with a watering can sprinkle the earth stake on a dry day? :elc: :bba

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Re: High Voltage DC..

Post by Ed Dinning » Thu Apr 21, 2016 8:30 pm

Hi Gents, HVDC has been used a lot with the development of HV rectifier and inverter devices. Plenty of +/- 500KV Dc on the western seaboard of the US (saves having earth currents).
Our own cross channel link and some other UK schemes use + and - 250KV DC links. The DC link saves the problems that would occur if we tried to synchronise the UK grid to the rest of Europe.

SWER is also used in rural Australia, but at 132KV 50Hz.

Note that on long lines and high voltages losses are very much lower using Dc instead of AC. These tend to be bulk feeder lines or interstate interconnectors.


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Re: High Voltage DC..

Post by Refugee » Fri Apr 22, 2016 2:47 pm

You should go and have a listen to one of those inverters in action.
They make almost as much racket as a domestic lawn mower of the type with a big sound box below the handle bar.
It is 10Khx over 100hz so it is a screech and a buzz in one.
The photos were taken about a mile from my home. We are shielded by a 60 foot pile of mining waste.
I also picked a day when the inverter was bound to be on full load.
There is also a very small noise on FM radio that sounds the same but only if the set is off tune.

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