P0400VR

描述

简述交流回路的标号细则？

答：（1）交流回路按相别顺序标号，它除用三位数字编号外，还加有文字标号以示区别。列如A411、B411、C411。

（2）对于不同用途的交流回路，使用不同的数字组。回路类别控制、保护、信号回路、电流回路、电压回路标号范围1~399、400~599、600~799，电流回路的数字标号，一般以使位数字为一组。

如A401~A409，B401~B409、C401~C409。。。。。。A591~A599等。若不够亦可以20为数为一组，供一套电流互感器之用。几组并联的电流互感器的并联回路，应取数字组中较小的一组数字标号。不同相的电流互感器并联时，并联回路应选任何一组电流互感器的数字组进行标号。电压回路的数字标号，应以十位数字为一组。

如A401~A409，B401~B409、C401~C409。。。。。。A591~A599等。若不够亦可以20为数为一组，供一套电流互感器之用。几组并联的电流互感器的并联回路，应取数字组中较小的一组数字标号。不同相的电流互感器并联时，并联回路应选任何一组电流互感器的数字组进行标号。电压回路的数字标号，应以十位数字为一组。

如A601~A609，B601~B609、C601~C609、A791~A799，····以供一个单独的互感器回路标号之用。

（3）电流互感器和电压互感器的回路，均须在分配给2的数字标号范围内，自互感器引出端开始，按顺序编号。列如：“TA”的回路标号用411~419，“2TV”的回路标号用621~629等。

（4）某些特殊的交流回路（如母线电流差动保护公共回路、绝缘监察继电器电压表的公共回路等）给予专用的标号组。

相对编号法：当两个设备的端子通过连线互相连接时，在安装接线图上，用相对编号法来表示设备某个端子（接线柱）的连线的连接去向。简单的说为：甲的端子上标乙的端子号，乙的端子标出甲的端子号。这个编号标在每个设备的端子连接线的线头处。在实际设备的接线柱以及端子排的端子接线头上都标有以相对编号法的编号，以标明连接的去向。
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