The faults occurring in different sections are difficult to identify using the traditional techniques. This paper investigates a fuzzy expert system for directional relaying, classification, and location of faults in double-circuit transmission lines. The current magnitudes measured at only one terminal of the double-circuit transmission line are used to compute discreet Fourier coefficients. Thus, this scheme does not involve any communication channel. The presented fuzzy expert system is achieved from the structure of MAMDANI system in LabVIEW software. Test case studies show the effectiveness of the presented scheme. The simulation results attest that the directional relaying, classification, and location estimation is very accurate. This scheme is adaptive to the change of fault location, fault resistance, fault inception angle, and fault type.

使用传统技术很难识别出发生在不同区域的故障。本文研究了一种模糊专家系统，用于双回输电线路的定向继电，分类和故障定位。在双回线传输线路的仅一个端子处测得的电流幅值用于计算离散的傅立叶系数。因此，该方案不涉及任何通信信道。所提出的模糊专家系统是通过LabVIEW软件中MAMDANI系统的结构实现的。测试案例研究表明了该方案的有效性。仿真结果证明定向中继，分类和位置估计非常准确。该方案适用于故障位置，故障电阻，故障起始角度和故障类型的变化。