本文目录一览:
- 1、什么是三相电和两相电
- 2、什么是两相电
- 3、两相电和三相电有什么区别?
什么是三相电和两相电
三相交流电是电能的一种输送形式,简称为三相电。三相交流电源,是由三个频率相同、振幅相等、相位依次互差120°的交流电势组成的电源。
三相交流电的用途很多,工业中大部分的交流用电设备,例如电动机,都采用三相交流电。而在日常生活中,多使用单相电源,也称为照明电。当采用照明电供电时,使用三相电其中的一相给用电设备供电,例如家用电器,而另外一根线是三相四线制中的第四根线,也就是其中的零线,该零线从三相电的中性点引出。
两根相线构成的供电回路方式叫两相供电,简称二相电。
二相电是二十世纪早期的多相交流电系统。发电机有两个绕组,输出电压是正交(相差90度)。系统通常有四条电线,每个相两条。
比较
单相电
二相电比单相电的好处是能够自行起动。现在的单相电动机能起动是由于有辅助绕组。
在早期的电机工程,两个独立的相会较容易分析和设计。直至1918年,发明了对称分量,工程师才能够容易地分析多相不平衡状况。
三相电
三相电最明显的优势是需要较小的输电设备,节省成本。三相电只需三条相线,不需要中线(电流互相抵消)。二相电需要四条线,但输电量较小。因此,商业运行的电力系统中,三相电取代了二相成成为了主流。
此外,三相电的输出是稳定,没有功率振荡。单相和二相电的发电机会的转轴会发出较大噪音,变压器则由于磁致伸缩发出噪音。
什么是两相电
两相电一般指两相电源。
通用型变频器绝大多数是交—直—交型变频器,通常尤以电压器变 频器为通用,其主回路图,它是变频器的核心电路,由整流回路(交—直交换),直流滤波电路(能耗电路)及逆变电路(直—交变换)组成,当然 还包括有限流电路、制动电路、控制电路等组成部分。
当位于同一桥臂上的两个开 关,同时处于开通状态时将会出现短路现象,并烧毁换流器件。所以在实际的通用变频器中还设有缓冲电路等各种相应的辅助电路,以保证电路的正常工作和在发生意外情况时,对换流器件进行保护。
扩展资料
三相电就是三根相线,三根线之间电压都是380v,用于三相电源供电设备比如三相电动机;两相电是两根相线,线与线之间电压也是380v,一般交流焊机用的比较多;单相电是由一根相线与一根零线组成,电压为220v,主要用于家用电器。简单来说,三根相位互差120度的火线构成三相电,其中任何一根火线和一根零线可以构成两相电。
参考资料:百度百科-两相电
两相电和三相电有什么区别?
一、电压等级不同
1、两相电:两相电的电压为220V。
2、三相电:三相电的电压则为380V。
二、用途不同
1、两相电:两相电一般用于学校及家庭。
2、三相电:三相电用于工厂及企业。
三、特点不同
1、两相电:两个绕组会平均地安装在发电机内,即是十字型。所以,输出电压相差90度,而不是180度。
2、三相电:当采用照明电供电时,使用三相电其中的一相给用电设备供电,例如家用电器,而另外一根线是三相四线制中的第四根线,也就是其中的零线,该零线从三相电的中性点引出。
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