T接电路暂态保护分析

由于T接线路与二端口线路相比,具有良好的经济性与环保优势,因而在超高压输电系统中将会有非常广泛的应用。然而使用传统的保护方法,很难对其进行有效的保护。将基于故障暂态电流的单端量无通信保护用于T接线路,并且根据故障暂态电流的特点,利用Daubechies小波计算暂态保护判据。通过在不同的故障位置、不同的过渡电阻、不同的故障时间以及各种故障类型的情况下,对实际T接线路进行的详细仿真,证明了暂态保护应用于T接线路的可行性。

Analysis of Transient Protection in T-circuit

T-circuits are used widely in extra high voltage(EHV) transmission system due to their significant economic and environmental advantages over two-terminal lines.But it is difficult to protect T-circuit using the traditional techniques.Non-communication protection based on fault transient current component is used in T-circuit,and in terms of the features of fault transient current component,transient protection criterion is calculated using Daubechies wavelet.The detailed simulation of T-circuit is carried out in different positions,different transition resistances,different fault times and different fault types,and it has proved the feasibility to use the transient protection in T-circuit.