一种改进的备自投逻辑

An improved switching logic of auto-close scheme

以110kV及以下电压等级变电所常见的分段备用电源自投装置和进线备用电源自投装置为例,结合现场工程实际,剖析了某公司分段备投装置WBT-821A的备自投装置动作逻辑缺陷,即:其'加速备投'开入如果使用不当可能造成备投误动或者无故延长负荷停电时间。为此,分别从软件设计上提出增设控制字和从屏柜设计方面提出备投开入采用'TWJ'的改进方法,另外,详细分析了某公司的进线备投装置CSC-246的特殊闭锁问题,指出了在实际工程实践中应注意的问题,对工程实践具有重要指导意义。

Taking bus coupler auto-closing logic and line-in auto-closing logic of 110 kV and below for instance, and associated with field engineering practice, this paper analyses logical flaws of segmentation auto-closing device WBT-821A ,i.e. it would malfunction or prolong the interruption duration gratuitously if the device＇s binary input named ＂accelerated auto-close＂ is not used properly. In order to figure out this flow, this paper presents an improved auto-closing logic not only from software designing by increasing two switch words but also from panel designing way by adopting ＂TWJ＂ as the binary input of ＂accelerated auto-close＂. Moreover, by analyzing a kind of special auto-closing blocking logic of line-in auto-closing device CSC-246, the paper also proposes some important engineering application tips. Hence, the paper would be of great value in field engineering practice.