35kV变电站母线保护特性与电流互感器饱和现象分析

Analysis of the Bus Portection characteristic and Current Tranaformer Saturation Phenomenon in 35 kV Substation

母线承担着汇集和分配电能的重要任务,其工作的可靠性将直接影响到发电厂和变电站工作的可靠性。母线发生故障时,可能会引起系统稳定性的破坏,造成严重的后果,母线在电力系统中的重要地位使得母线接线方式及母线保护方式的选择与运行成为保证电力系统安全运行的重要环节之一。基于此,分别分析了单母线完全电流差动保护基本原理、比率制动特性的中阻抗母差保护与数字式母差保护基本判据与算法,最后分析了对母线保护影响较大的电流互感器饱和现象。

Buses undertake important tasks of assembly and distributing electric energy, its reliability will directly effect the reliabilities of the power plant and the substation work reliabilites. When faults occur in the buses, they may damage the system stability, bringing about serious consequences. The important actions of the buses in the power system make the selection of the bus connecting mode and the bus protection way and operations become one of important links to en- sure the power system security. Bused on this the basic principle of total current differential protection of the single bus, mid - impedance has differential protection of the ratio breaking ctharacteristic and the algorithm of the basic criteria of the digital bus differential protection are analyzed. Finally, the current transformer saturation phenomenon to great effect of the has nrotection is analvzed.