"사용자:책읽는달팽/번역장1"의 두 판 사이의 차이

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Many of these HVDC lines in 2008 transfer power from renewable sources such as hydro and wind. For names, see also the [[List of HVDC projects#Maps|annotated version.]]]]
 
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== High voltage transmission ==
[[High voltage]] is used for [[electric power]] transmission to reduce the energy lost in the [[Electrical resistance|resistance]] of the wires. For a given quantity of power transmitted, doubling the voltage will deliver the same power at only half the current. Since the power lost as heat in the wires is proportional to the wires' resistance as a share of the total resistance, and doubling voltage allows for the quadrupling of non-transmission resistance without losing power, doubling the voltage reduces the line losses per unit of electrical power delivered by approximately a factor of 4. While power lost in transmission can also be reduced by increasing the conductor size, larger conductors are heavier and more expensive.
 
Practical conversion of power between AC and DC became possible with the development of [[power electronics]] devices such as [[mercury-arc valve]]s and, starting in the 1970s, semiconductor devices as [[thyristor]]s, [[integrated gate-commutated thyristor]]s (IGCTs), [[MOS-controlled thyristor]]s (MCTs) and [[insulated-gate bipolar transistor]]s (IGBT).<ref name="John Wiley and Sons">{{cite book|author1=Jos Arrillaga|author2=Yonghe H. Liu|author3=Neville R. Watson|author4=Nicholas J. Murray|title=Self-Commutating Converters for High Power Applications|url=https://books.google.com/books?id=L8uVmGQrei4C|accessdate=9 April 2011|date=9 October 2009|publisher=John Wiley and Sons|isbn=978-0-470-74682-0}}</ref>
 
== Advantages of HVDC over AC transmission ==
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