Method for Parameter Decoupling for Four-circuit Transmission Lines on The Same Tower

It's difficult to make fault analysis of four-circuit transmission line on the same tower because of the complexity of its parameters. A Lot of methods of decoupling the mutual impedance have been presented in some papers, which are proposed along with the matrix diversification and are difficult to understand the physical meaning of the sequence components and sequence network. The decoupling process proposed in this paper is in a physical point of view to explain the process of getting the sequence components. And it's easier to learn about the physical meaning of the sequence network in the process. A new decoupling method is also proposed in this paper. And the phase electrical measurements can be decomposed into twelve-sequence components which are completely independent from each other in this method.