XPost: misc.industry.utilities.electric, sdnet.politics, sac.politics   
   From: noone@nospam.com   
      
   Στις 3/6/2024 5:35 μ.μ., ο/η Michael F. Stemper έγραψε:   
   > On 30/05/2024 14.15, Leroy N. Soetoro wrote:   
   >> https://fox5sandiego.com/news/local-news/power-lines-to-be-installed-   
   >> underground-across-san-diego-but-why/   
   >>   
   >> SAN DIEGO (FOX 5/KUSI) — The city of San Diego will increase spending   
   >> fivefold on utility undergrounding projects, going from about $50 million   
   >> a year to nearly $250 million a year to bury utility lines underground   
   >> across the city.   
   >   
   > Any idea whether it's only distribution, or if it's also transmission?   
   >   
   in big cities it's also transmission-here, in Iraklion, Crete the HV   
   line (150 kV) that connected the Therissos substation with the   
   Linoperamata power station, was overhead of a very heavy populated area   
   so they buried it. As the voltage raises, so do capacitive losses, which   
   are very big in say, 400kV. Medium voltage cables are nothing to worry   
   about, so are low voltage ones. In Athens and in Thesalloniki there are   
   buried 150 kV cables and 150/20 kV substations within the cities. The   
   400/150 kV substations are in rural areas, of course. The main problem   
   are the complaints of the people that the overhead line will go through   
   their properties-the "not in my back yard"problem. Here, the underwater   
   HVDC line, that will connect Crete with the mainland is ready, they are   
   already building the converter station (aka valve hall), they have   
   brought the VERY heavy transformers, only the people that the HV   
   tranmsission line is going to pass through their areas say no, no,no. A   
   very expensive project that is going to shut down the rust buckets of   
   Linoperamata and Xylokamara, that use 300,000 tons of heavy fuel each   
   year (which is also VERY expensive) and will save up to 100,000,000   
   euros each year in utility costs, is being delayed because some people   
   are stubborn! They say that the line should go underwater, should be   
   buried. But 150 (or even 400)kV cables are special order, they are not   
   "off-the-shelf" like MV and LV cables. Increased installation costs, but   
   worse capacitive losses which will  defeat the purpose of using HVDC for   
   the underwater cable, if they're going to use HVAC for another cable.   
      
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