While having a few entering route and switchgear group, should check phase-sequence (for 6.3.2 section).
有几路进线和几个开关柜组时，要检验相序（见第6.3.2节）。
2
This paper describes the operation principle of a simple phasesequence relay, its parameter calculating method, and the correlative relationship and optimization problem on element parameters.
本文阐述了一种简单的相序保护器的工作原理及其参数计算原则，讨论了元件参数之间的相对关系和优化问题。
3
Now, more and more waste of intersection resource and accidents are due to incorrect setting of phase, sequence and intersection geometry design.