Ingenieur Vol. 75 ingenieur July 2018-FA - Page 30

INGENIEUR Do You Know? Future Energy By Pang Soo Mooi Power Transmission: Rise of the “SuperGrid” - The Economist Transmitting power over thousands of kilometres requires a different sort of technology from the AC now used to transmit it tens or hundreds of kilometres through local grids. In China, Europe and Brazil, as well as in Oklahoma, a new kind of electrical infrastructure is being built to do this. Some refer to the results as DC “supergrid”. When electricity flows down a line as AC, energy travels as a wave. When it flows as direct current, there is no oscillation. Both works well, but the deciding factor in AC’s favour in the 19 th century was the transformer. This allows AC voltages to be increased after generation, for more efficient transmission over longish distances, and then decreased again at the other end of the line, to supply custome ϊd̸͕́ͥЁѡ)ѥɕЁɕЁՍɕѡɽ՝)=ٕȁɅ͍ѥхх́ѡ)مх̸́́͡ٽх́Ѽ͠)ɕЁѡȰ ̀ѡ́݅ѕ̤)ٕȵɕͥչЁɝ䁥ѡхͬ)Օ饹́ѕɹѥ́ѡɽ՝ѡɕ)ɕЁ́Ёٔѡ́ɽ1х) ɥ́ɔͼȁѼե%)ѥձȰѡɥЁѡȁ屽́́͵Ȱ)͔ 䁙ȁɔݕ)ѡեمЁ (()Y=0)Y=0(ԁ)U1dMAQ5 H))U9̀)YՅѡ՝ѡ䁅ɔɅ͍ѥх)́ѡ͔ Ʌ饰%ɔ)ѡ͔ȁU!Y ɥ䁥́Ё͍ɥ)́qɕӊtȁѡ%Ё́ٔեє)ЁեLՑЁѡɽ՝)ձѥٕ́ѡ)5 ѕɥɬ̃LQ))Mѡȁٕѥݼɥ́ѕɥ)ٔɽѡ̸QЁݕɔ)ȁ饹Q䰁ѡմ́ɕɕ)ȁЁѥ̸1ٕͥȁ)Ёѡȁѕɥ́ٔͼ͕)Uѥɕѱѡ՝ɥ)ѡЁѡЁɭ́ͭɽѕ́)ЁձɅ٥Ёи а́ɕѕ)ѥѡɥ M䁥)A ɥѽȁ ѥȁ ɹ)5Uٕͥ䰁A͉ɝ́܁)ѡи!͔́́Ѽɕєѕͅ)͔ѡյ)5́аЁЁͥа٥́ѕ)ɕи%Ё́ѕձ͕)ɉ坕ɽɽQ)ѡ͔ͥЁɥ͍ݽձɕ)ɕեɔѕɅѡȁѡٕѥ)丁 ЁЁ́ٔѡѼɔ)ɕ͔ͥѥٕ䁍ɝ̰ݸ)ѥ̸ ѕɥ́ѡٕЁ)̰ͼѡ́ɽ䁥́хи=ѽ)ѡаɵɕЁ̰)́Ёѽ᥌Q́́ɅЁѼ䁍ٕѥ)ѕ䁥ɕ̸%ݕɔѼЁ)ѕ٥Ёݽձͥ䁉)䁕嵕̸) ѕȁ ѕɥ̀Q䁉́ɔQ))ѕЁ䁱ѡ)ѕ䁱̸ٕ)5Ё͍ѥ͍ٕɥ́ɔѡɕձЁ)Ʌєɥиܰѡ՝ȁ)=Ս͕ɕ䁡́)Ѽ] QͥՄUٕͥ) 1)ԁѡ5͕́ͅ%ѥє