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相序是指三相交流电到达最大值的先后顺序,分为顺序和逆序。相序是相对的,不是绝对的。任意调换两根相线就可以改变相序。确定三相电源的相序很重要。三相发电机或三相变压器的并联运行,其三相相序必须一一对应,绝对不许错接。三相电动机的转向也由三相电源的相序确定。1判别原理三相电源的相序判别可用图1所示的电路。
Phase sequence refers to the three-phase alternating current to reach the maximum sequence, divided into order and reverse order. Phase sequence is relative, not absolute. Any exchange of two phases can change the phase sequence. It is important to determine the phase sequence of the three-phase power supply. Three-phase generator or three-phase transformer parallel operation, the phase sequence must be one-to-one correspondence, absolutely not allowed wrong connection. Three-phase motor steering is also determined by the phase sequence of the three-phase power. 1 discrimination principle Three-phase power phase sequence can be used to identify the circuit shown in Figure 1.