单电源辐射线路保护若干问题分析

单电源辐射线路在220 kV及以上系统中广泛存在，与环网双电源线路相比，这些线路保护的配置、整定、运行等均存在一些特殊问题。结合目前国内常用的保护装置和河北电网的实际，就纵联保护的运行方式、电源侧保护的整定、重合闸方式、受端站保护运行方式、辐射线路保护的配置等问题进行分析，认为宜配置能同时适应环网线路和辐射线路两种方式的纵联保护，并应合理整定。

ANALYSIS OF SOME PROBLEMS IN PROTECTION OF SINGLE SOURCE RADIAL SUPPLY LINE

The single source radial supply lines generally exist in power systems of voltage 220 kV and over. Compared withdouble source lines in looped network, there are some special problems in the architecture, setting and operation of theirprotection system. Considering the currently, commonly used protection device and actual conditions of Hebei PowerNetwork, this paper analyzes the operating mode of pilot protection or differential protection. the setting of the protection atsource side and the mode of reclosing, the operating mode of the protection at load side and the architecture of radial supplyline protection. it's pointed out that the pilot protection is preferred in the single source radial supply lines owning to itsadaptation to the two operating modes of looped network (double source) and radial supply network (single source) withreasonable setting.