摘要
分析了单相牵引变压器短路阻抗的特点,并根据系统等值模型,对两相式电铁牵引站供电线路的短路故障计算进行了分析。结果表明,与一般三相电网相比,短路故障分析中单相牵引变压器的短路阻抗应乘以0.5的折算系数;两相式供电线路的负荷阻抗应乘以0.866的折算系数。结合实际工程中两相式电铁牵引站供电线路的保护配置和电网稳定性要求等情况对保护主要整定原则进行了深入分析,提出了差异化的距离保护、零序(和流)、保护TV断线过流保护整定原则。分析了各种重合闸方式的利弊,给出了推荐的重合闸方式整定原则。
This paper analyzes the characteristic of the short circuit impedance of single-phase traction transformer, and calculates the short circuit fault of the two-phase power supply line of the electrified railway based on the system equivalent model. The result of the analysis suggests that compared with the common three-phase power network, the impedance of single-phase traction transformer should multiply 0.5 as a conversion factor in the short circuit fault calculation and the load impedance of the two-phase power supply lines should multiply 0.866 as a conversion factor. Considering both the protection configuration of the electrified railway line and the requirement of power system stability,this paper presents an in-depth analysis on the main protection setting principles and puts forward the differentiated setting principles of distance protection,zero-sequence current protection and TV break-up over-current protection. The paper also analyzes the advantages and disadvantages of different reclosing modes and recommends the setting principles for the reclosing.
出处
《电网与清洁能源》
北大核心
2015年第4期47-53,共7页
Power System and Clean Energy
关键词
两相式电铁供电线路
单相牵引变压器
短路故障计算
保护整定原则
two-phase power supply lines of electrified railway
single-phase traction transformer
short circuit fault calculation
protection setting principles
