摘要
随着城市电网的发展,变电站采用两线三变扩大内桥接线应用越来越广泛,而考虑负载率等问题,往往采用一期投运2台主变压器的方案。讨论了两线两变和两线三变接线的运行方式和各自投逻辑,深入分析了两线三变接线主变压器保护与备自投配合的逻辑以及考虑断路器拒动情况的备自投逻辑,提出两线两变接线110 kVⅢ母线无保护的问题并给出了相应解决方案,提高了供电可靠性和工作成效。
Along with the development of urban power grid, the connection of enlarging inner bridge with two-wire and three transformers is more widely used in substation. Considering some problems such as load rate and so on, two transformers is often put into operation first. The paper discusses the operation mode and the back-up switching equipment logic in the connection of enlarging inner bridge with the two-wire and two transformers as well as two-wire and three transformers, analyzes the relationship between main transformer protection and the back-up switching equipment logic for the two-wire and three transformers,and takes into account the back-up switching equipment logic of resist-operation on a circuit breaker. In the end, the paper puts tbrward the problem that there is no protection for 110 kV m busbar with the connection of the two-wire and two transformers, and gives the corresponding solution for improving the power supply reliability and work effect .
出处
《陕西电力》
2016年第12期76-79,共4页
Shanxi Electric Power
关键词
电力系统
扩大内桥接线
运行方式
各自投
主变压器保护
power system
enlarging internal bridge connection
operation mode
back-up switching equipment
transfornler main protection
