英语翻译2-1 IntroductionThree-phase circuits are very important

英语翻译
2-1 Introduction
Three-phase circuits are very important because almost all electric power is generated and distributed three-phase.The basic component of a three-phase circuit is an ac voltage generator,also called an alternator,that produces three voltages of the same peak values but with phase angle differences of 120º.The alternator windings are interconnected such that the electrical energy goes out over either three or four wires.
As will be seen,a three-phase circuit has advantages as compared to a single-phase circuit---a circuit having just a single voltage supply.It also has advantages over a two-phase circuit,which is a circuit energized by an ac voltage generator that produces two voltages of the same peak value but that are phase-displaced by 90º.Except for a few special applications,three-phase circuits are more advantageous than circuits of a greater number of phases.As a result,three-phase power generation,distribution,and utilization will be important for the foreseeable future.
2-2 Three-phase voltage generation
As stated,a three-phase voltage generator produces three voltages having the same peak value but differing in phase angle by 120º.Naturally,all three voltages are of the same frequency.These voltages may be across just three wires,to form a three-wire,three-phase circuit.Or these voltages may be between three wires and a neutral wire,to form a four-wire,three-phase circuit.We will now consider the generation of these voltage.
For a balanced three-phase circuit,three sinusoidal voltages add to zero at every instant if they have the same peak value and frequency but are phase-displaced by 120º.This means that the vertical heights of the three curves add to zero at every point along the horizontal axis.The fact that these sinusoids correspond to voltages has no bearing on their sum being zero.

2-1引言
三相电路是非常重要的,因为几乎所有的电力产生和分发三相.在三相交流电路是一个电压发生器的基本组成部分,也被称为发电机,产生的三个相同的峰值电压,但与120 °相位角的差异.该发电机绕组是相互关联的,这样的电能可以出去了三,四线.
正如将要看到的,三相电路的优势相比,单相电路---电路刚一单电压供电.它还拥有一两个优势相电路,它由一个交流电压发生器产生的两个峰值电压相同,但都是相90度流离失所通电的电路.除少数特殊应用,三相电路更有利,比一期更多的电路.因此,三相发电,输送和利用将是重要的可预见的未来.
2-2三相电压生成
如上所述,三相电压发生器产生三种电压具有相同的峰值,但在不同相位角120 º.当然,所有三个电压相同的频率.这些电压,可在短短3线,形成三线,三相电路.这些电压或之间可能三线和中性线,形成一个四线,三相电路.我们现在考虑这些电压生成.
对于平衡三相电路,3正弦电压加于每一个瞬间为零,如果它们有相同的峰值和频率,但相120 º流离失所.这意味着这三个曲线的垂直高度添加到零每沿水平轴点.事实上,这些血窦对应的电压和自己没有被零和关系.