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The Levis De-Icer is a High voltage direct current (HVDC) system, aimed at de-icing multiple AC power lines in Quebec, Canada. It is the only HVDC system not used for power transmission. In the winter of 1998, Québec's power lines were toppled by icing, sometimes up to 75 mm. To prevent such a damage, a de-icing system was developed.〔(【引用サイトリンク】title=The Hydro Québec De-icer Project at Lévis substation )〕 The Levis De-Icer can use a maximum power of 250 MW; its operation voltage is ±17.4 kV. It can be used on multiple 735 kV AC power lines. When there is no icing, the Lévis De-Icer installed at Hydro-Québec's Lévis substation operates as static VAR compensator improving the stability of the AC lines. == What the De-icer is and what it does == Because of what happened in Quebec in the winter of 1998, Hydro-Quebec TransEnergie created a De-icing machine to insure that another event like this wouldn't happen again. The De-icer is a machine that runs a high direct current (DC) into a selected transmission line in order to melt the ice on it. However, because the operation in this mode may be very infrequent, when the installation is not being used as a De-icer it is used as a Static Var Compensator, SVC for short, by using the HVDC valves as a Thyristor Controlled Reactor. An innovative design is used, minimizing the power losses of the valves in SVC mode. The reason an AC current wasn't used is because AC current requires a lot of reactive support. It would take a much higher amount of voltage to push the necessary current through the line.The high voltage system in Quebec runs in two transmission corridors, one high voltage system runs in the north-west from the main load centres of Montreal and Quebec and the other runs north-east along the Saint-Lawrence river. It is the latter corridor that is mainly in an area prone to ice storms that deposit ice on the transmission lines. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Levis De-Icer」の詳細全文を読む スポンサード リンク
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