Fault diagnosis of double circuit lines on the same tower based on six-sequence component and expert system

With the development and expansion of modern power system, the double circuit lines on the same tower are used widely as an important electric power transmission mode, but it is particularly complex to determine the failure of the double circuit lines. This paper judge whether the fault occurs in the double circuit lines or not using the topology model according to the information of the fault at first. Then the paper proposed a fault diagnosis method, which finds the fault location and analyses the feature of the double circuit lines on the same tower fault diagnosis based on six-sequence component and expert system. The simulation results of PSCAD given in this paper illustrate that this fault diagnosis method can make a rapid and accurate diagnosis in the double circuit lines.