【摘要】 母线是电力系统的重要元件。母线单失灵保护的拒动影响电网安全稳定运行,甚至造成局部电网的解列。针对220 kV双母线双分段改造难度大、危险点多等特点,以某500 kV变电站220 kV母线改造工程为例,对线路间隔、主变压器间隔进行分析,重点探讨失灵互启、手合继电器(SHJ)接点内容,保留母差保护装置之间失灵互启回路,避免特殊操作方式下发生故障却无法切除的隐患发生,明确SHJ接点所需要的数量,减少不需要的多余回路,为同类变电站改造提供参考。更多还原

【Abstract】 Bus is an important element of power system.The failure of single bus failure protection affects the safe and stable operation of power grid,and even causes the disconnection of local power grid.On account of characteristics of the reconstruction of 220 kV dual-bus dual-subsection,such as great difficulty and many dangerous points,the 220 kV bus reconstruction project in a 500 kV substation was taken as an example to analyze the line interval and main transformer interval.The failure mutual-start and SHJ contacts were discussed in this paper.The mutual start circuit between bus differential protection devices was reserved to avoid unremovable failures in special operation modes,clarify the required number of SHJ contacts,and reduce the number of redundant circuits,which provides a reference for the reconstruction of similar substations.更多还原