Westinghouse wins
Westinghouse wins
(OP)
The end of an era in NYC -
http:// cityroom.b logs.nytim es.com/200 7/11/14/of f-goes-the -power-cur rent-start ed-by-thom as-edison/
http://
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Westinghouse wins
I enjoyed reading that. I also enjoyed the internal link;
<opened his Pearl Street power station on Sept. 4, 1882.>
Thanks
Yours
Bill
RE: Westinghouse wins
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Westinghouse wins
I couldn't resist adding to that long list of comments.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Westinghouse wins
For me, it's real news.
BTW, I heard about some very intresting project in the USA,
HVDC link between USA and Mexico. It's true?
Regards.
Slava
RE: Westinghouse wins
So I guess maybe my I was too quick to declare Westinghouse the winner.
RE: Westinghouse wins
Using DC distribution simplifies back-up power, eliminates harmonics problems, does away with rectifiers and electrolytic capacitors and has some other benefits, too.
I have visited two (test installation) sites where 350 V DC is being used throughout whole companies and has been so for over a year.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Westinghouse wins
There is some interest in 350V+- DC power for large data centers in the U.S. The primary stated benefit being improved efficiency. I'm not yet convinced of that.
Of course 48VDC is still prevalent for telecommunications equipment as it always has been. Some of the new digital telecom equipment is shifting toward AC power.
RE: Westinghouse wins
I think DC distribution in a building can make sense, especially with the more recent prevalence of electronic loads, and we already know that HVDC grid ties make sense. But there is a LOT of transmission and distribution in between where DC makes no sense at all.
As in all things, there is no one answer; it takes a lot of different instruments to make a good symphony. Edison should never have spurned Tesla, together they would have been able to realize the greatest potential from the outset.
RE: Westinghouse wins
http://hightech.lbl.gov/dc-powering/
We also had an in-depth discussion in thread248-182616: Feeding SMPS and other Electronics loads from Inverters
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Westinghouse wins
No doubt there is room for considerable improvement of efficiency of typical switch-mode computer power supplies. Newer UPS's and computer power supplies are vastly improved over those of only a few years ago. Major server manufacturers have recognized the need for improvement and are providing much better power supplies and publish efficiency numbers. Inexpensive power supplies in typical desktop computers are still pretty miserable.
Regardless of which system is used, if the discussion results in improved overall efficiency, it is worthwhile.
RE: Westinghouse wins
Actually, I don't know, what is very important in this forum:
Practical tips, like to setting of relay
or such topics. Lot of us are so closed with practical works
and don't know about other intresting projects and solutions.
Learn, Learn and Learn.
Best Regards.
Slava
RE: Westinghouse wins
In answer to your question regarding the connection to Mexico, that would be at any interface with the power grid of (most of) Texas which is referred to as ERCOT (Energy Reliability Council of Texas.)
Texas is asynchronously connected to the rest of the world. There are already two (and maybe more that I can't remember) HVDC connections to the rest of the world, one from Oklahoma and one at another point I can't remember and am too lazy to google.
HVDC transmission is the only way power can be sent into or out of the ERCOT grid, so any interconnects from Mexico to Texas will have to be HVDC. I would assume that connect points from Mexico to other points in the US grid (New Mexico, Arizona or California) would be AC.
rmw
RE: Westinghouse wins
This reminds me about the "zero miles" HVDC link in Japan. About half Japan has a 50 Hz grid and half has a 60 Hz grid. An HVDC link with "zero length" is used to connect these two blocks together.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Westinghouse wins
Yes, it's back to back connection
See attached.
http:/
Regards.
Slava
RE: Westinghouse wins
Power transfer between between Texas and Mexico are mainly HVDC but they are planning on installing a Variable Frequency Transformer for a 100 MW capacity. It plays the same role as a back-to-back HVDC but with a motorized transformer instead of power electronics.
That VFT is a quite special but interesting equipment used for the first time here on Hydro-Quebec's network.
http
Regards,
LMB
RE: Westinghouse wins
RE: Westinghouse wins
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Westinghouse wins
But several things, what I puted attention from first reading:
1. VFT, connection like to Japan - unvalible ( must be two grids with same freq.)
2. Only back to back connection possible. Not long transmission.
3. 100MW transmision only ( of course on this moment). Mexico link was 150MW.
4. Reference: only one project (no data about other).
5. No words like to "cost saving solution".
6. Place saving, need check with 100MW application of HVDC.
7. Low maintanance? I don't know, it's rotating and "small"
3000 HP DC motor.
Not clear something.
May be is good solution for interconnection of small grids.
I haven't any conection to HVDC projects.
Regards.
Slava
RE: Westinghouse wins
I remember having read that link some time back and passing it up the management chain. I'd like to see a study of the heat loss in the VFT vs HVDC route.
My guess is that is why it is only a 100 MW device. Nice I guess if you only need to transmit 100MW.
rmw
RE: Westinghouse wins