电铁负荷特性对微机保护启动元件的影响研究

为研究电铁负荷对微机保护启动元件算法的影响,根据某区域电网实际参数,利用PSCAD建立了典型电气化铁路牵引系统模型,及微机保护中相电流突变量启动、相间电流突变量启动及半周电流积分启动三种常见启动元件的数学模型。在此基础上,结合电铁负荷的特性,从理论上分析了电铁负荷对三种算法的影响,并进行了数字仿真验证,得出电铁负荷对各启动算法影响的相关结论,为在电铁负荷较重地区装设的微机保护装置启动元件算法选择提供了理论依据。

Research on Influence of Electric Locomotive Load on Startup Component of Microcomputer Protection

In order to study the influence of electric locomotive load on startup component of microcomputer protection,a typical electrified rail traction system model and the mathematical model of three common components of phase current mutation startup,interphase current mutation startup and semi-cycle current integral startup in microcomputer protection are built with PSCAD according to the actual parameters of power grid in some region.The influence of electric locomotive load on the calculations methods of the three components is analyzed theoretically based on the characteristics of electric locomotive.In addition,digital simulation verification is performed and the relevant conclusions are obtained.The theoretical basis is provided for the algorithm selection of startup components for microcomputer protection device in the area where electric locomotive load is heavy.