Body
Mick, from my friend Fredric Fletcher who is working with HVDC
transmission lines.
In my experience I think it is wise to not rely upon earth return.
There is even some logic to not having an earthen system.
The earth returns for the Pacific Intertie at Sylmar impose so much
current in the water lines there that the water pipes can only handle it
for a half hour.
An ocean grounding line reduces that flow substantially. It is in the
process of being replaced now as the original one has corroded.
With regards to the Southern Transmission System there has been a
lawsuit on the earth return that has been in process for over 20 years
regarding some hog and dairy operations. None of the businesses have
been successful, they are all out of work failed operators. I think it
is an effort supported only by the attorneys who have some hope of
recouping some fees for a quarter of a century of legal work. But it
has been shown in the court that the operators can not even correlate
the current flows on the farms with the operation of the line.
There can be a lot of imagination in electrical effects.
Sent from my iPad
On Dec 7, 2018, at 4:51 AM, Norman Wootan <[email protected]
<mailto:[email protected]>> wrote:
> <inijalchpfmkbhfl.pn
>
Hey, Bert, Phil got an instant erection over this! Toby, Golka only
dreamed!
On 12/7/2018 6:38 AM, Norman Wootan wrote:
Ole, thank you for the photos of the HV components of the HVDC systems.
Take a look at this attachment from Seimens.. These systems are
certainly impressive and they have to use huge halls for totally indoor
operation at such high potentials ( one million V) vs the old HVAC
outdoor yards.
On 12/7/2018 6:28 AM, Norman Wootan wrote:
Ole and Fredric Fletcher, pay attention to the polarity and methodology
of transmission of the HVDC. Remember the articles regarding the earth
ground return problems up in dairy country, Wisconsin where cattle were
being electrocuted by poor grounding systems in rural electric grid. I
can recite a real life problem with imposing a potential into the earth
on the dealing with ground return. One of our Nursing facilities had
three seperate buildings that shared a two pipe chilled / hot water
system with buried steel 4 inch lines (supply/ return). The electrical
system was 480VAC backbone with delta/wye step down transformers which
gave a base 208VAC with center tap ground for 120VAC. The facility
operated just fine for 50 years. Along came an Electrical Contractor
that installed a new distribution transformer (100 KVA) during an
upgrade to one of the out buildings. After operation for several years
the buried 4 inch steel AC/heating lines developed leaks and sections of
the removed lines showed electrolyitic (galvanic) errosion. I
discovered that the Contractor had installed a delta/delta step-down
(100 KVA) transformer and grounded one (L-2) of the Secondary terminals
to get a neutral buss common for 120VAC. A huge NO,NO cause you had a
potential of 230V to earth ground. The difference in ground potential
between buildings created the galvanic errosion because there was a
ground return current back to the 480/208VAC backbone in the mains
building. This was a huge lesson on the problems encountered with
relying on earth ground return path.
On 12/7/2018 3:58 AM, Norman Wootan [email protected] [EVGRAY] wrote:
https://www.electronicshub.org/high-voltage-dc-transmission-system/
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