thaibeachlovers Posted December 7, 2013 Share Posted December 7, 2013 Most of the hi tension transmission wires I see around Thailand are like those back home, they are in threes. However, a while back I saw a grouping of 4 wires- 4 each side of the tower. Can anyone explain that set up for me please? Thanks. Link to comment Share on other sites More sharing options...
David48 Posted December 10, 2013 Share Posted December 10, 2013 If you seen something like this ... Photo Credit Or this ... http://s3.freefoto.com/images/13/60/13_60_91_web.jpg (photo too big for the post) The '4th' wire is the top one and it's for Lightning protection. The wires are grounded at intervals and basically function as continuous lightning rods, attracting lightning bolts and conveying them around the current-carrying wires to the earth. I think the Yanks call them "static lines". Link to comment Share on other sites More sharing options...
wayned Posted December 10, 2013 Share Posted December 10, 2013 If they are connected in the "delta" configuration, only three wires are required, no ground. If they are connected in the "WYE" configuration, there are four wires, a ground is one of them. The high tension wires on the towers near me are connected in the "WYE" configuration, 4 wires, but the three phase on the electric poles on the street are connected in the "delta" configuration, only 3 wires. If you want a better explanation just google "wye connected electrical systems". Link to comment Share on other sites More sharing options...
thaibeachlovers Posted December 12, 2013 Author Share Posted December 12, 2013 If you seen something like this ... Photo Credit Or this ... http://s3.freefoto.com/images/13/60/13_60_91_web.jpg (photo too big for the post) The '4th' wire is the top one and it's for Lightning protection. The wires are grounded at intervals and basically function as continuous lightning rods, attracting lightning bolts and conveying them around the current-carrying wires to the earth. I think the Yanks call them "static lines". No, that wasn't it, and I do know the difference between the wires with the big insulators and the ones without. The towers I saw had four wires with the big insulators and two of the ones without. So, like your picture, but with another set under the 6 hi tension wires. Wish I'd taken a photo, but didn't. Anyway, thanks for replying. Link to comment Share on other sites More sharing options...
Crossy Posted December 12, 2013 Share Posted December 12, 2013 Like these? Sadly, I have no idea why 4 wires Link to comment Share on other sites More sharing options...
thaibeachlovers Posted December 13, 2013 Author Share Posted December 13, 2013 Thank you Crossy, for that picture. I spent ages looking at pictures of hi tension line towers on the internet trying to find one like that, without success, and it's amazing how many different tower versions there are. I know what I saw, but I was doubting that I'd ever be able to prove it. Link to comment Share on other sites More sharing options...
Mudcrab Posted May 28, 2014 Share Posted May 28, 2014 Like these? 7--1773916-high%20voltage%20power%20pylons_1.jpg Sadly, I have no idea why 4 wires HVDC? Not likely I agree. Link to comment Share on other sites More sharing options...
Daffy D Posted May 29, 2014 Share Posted May 29, 2014 Like these? 7--1773916-high%20voltage%20power%20pylons_1.jpg Sadly, I have no idea why 4 wires What! Crossy stumped on an electrical question The OP should get a prize 1 Link to comment Share on other sites More sharing options...
Crossy Posted May 30, 2014 Share Posted May 30, 2014 Not wanting to leave this hanging I asked on the IET forum (using the photo I posted earlier). It could indeed be HV DC, there's an amazing amount around the world including a link between Thailand and Malaysia http://www.energy.siemens.com/br/pool/br/transmissao-de-energia/transformadores/hvdc-high-voltage-direct-current.pdf (page 23, but no photos of the towers in that document). More here http://en.wikipedia.org/wiki/High-voltage_direct_current 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now