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答:从發電廠到用電地點的電路要用三條電线,是因為現代的電力系統幾乎都是採用三相制的(兒參[1],第103頁;[2],第247頁;参[3],第423頁)。所以这問题就歸結到一個从純粹的实用和經济观點才能解答的電工学底基本問题:為什么要採用三相制?要找出一個唯一的或主要的理由來說明这問题是不可能的,因为三相制是由於应用方便逐漸發展形成的,而不是一次制定的。耍在这里举出幾個比較中肯的根本理由也是困难的,可以說:幾乎还没有一本教科書(普通物理学的或電工学的)能够全面地來說明採用三相制的理由。現在我們來試着歸納一
A: There are three wires to be used in the circuit from the power plant to the point of electricity use because most modern power systems use three-phase systems (Ginseng [1], p. 103; [2], p. 247; See [3], p. 423). So this question comes down to a basic problem of electrotechnical engineering that can be answered from a purely practical and economic point of view: why three-phase system should be adopted? It is impossible to find a single or major reason to explain the problem, Because three-phase system is due to the convenience of the application gradually evolved, rather than once formulated. It is also difficult to cite a few more pertinent basic reasons here, and it can be argued that very few textbooks (general or electrotechnical) provide a comprehensive explanation of the rationale for adopting a three-phase system. Now let’s try to summarize one