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在一般的电学教材中,对化学电源电动势的产生原理是有比较透彻的分析的。但对机械电源(发电机))电动势的产生却缺乏类似的分析。在三相 Y 形供电中,当三相用电平衡时,省去中性线后,原路电流不变的道理在一般电学教材中,也都解释为:因中性线中合成电动势为零,所以中性线有无皆可。然而这种解释常会使人感到不满足,因为它没把省去中性线后各相电源的相互影响、相互制约的内在本质讲出来。下面就来谈谈这两个问题。
In the general teaching of electricity, the principle of the generation of chemical power electromotive force is a more thorough analysis. However, there is a lack of similar analysis on the generation of electromotive force for a mechanical power source (generator). In the three-phase Y-shaped power supply, when the three-phase power balance, eliminating the neutral line, the original circuit current unchanged in the general teaching of electricity, are also interpreted as: neutral neutral electromotive force is zero , So there is no neutral line. However, such explanations often make people feel unsatisfied because it does not explain the intrinsic nature of the mutual influence and mutual restraint of the power supplies after eliminating the neutral line. Here to talk about these two issues.