01671nas a2200229   4500000000100000000000100001008004100002260001200043653001500055653001000070653002100080653002300101100001700124700001500141700001900156245010000175856009900275300001000374490000600384520103700390022001401427       2020                            d  c03/202010aSimulation10aFuzzy10aFault Protection10aTransmission Lines1 aNaresh Kumar1 aCh. Sanjay1 aM Chakravarthy00aMamdani Fuzzy Expert System Based Directional Relaying Approach for Six-Phase Transmission Line  uhttps://www.ijimai.org/journal/sites/default/files/files/2019/06/ijimai20206_1_5_pdf_10077.pdf  a41-500 v63 aTraditional directional relaying methods for 6-phase transmission lines have complex effort, and so there is still a need for novel direction relaying estimation scheme. This study presents a Mamdani-fuzzy expert system (MFES) approach for discriminating faulty section/zone, classifying faults and locating faults in 6-phase transmission lines. The 6-phase fundamental component of currents, voltages and phase angles are captured at single bus and are used in the protection scheme. Simulation results substantiate that the protection scheme is very successful against many parameters such as different fault types, fault resistances, transmission line fault locations and inception angles. A large number of fault case studies have been carried out to evaluate reach setting and % error of proposed method. It provides primary protection to transmission line length and also offers backup protection for a reverse section of transmission line. The experimental results show that the scheme performs better than the other schemes.  a1989-1660