A wide-area protection method based on directional traveling wave energy

In order to improve the reliability in traditional traveling wave protection, a wide-area protection method based on directional traveling wave energy was proposed in this paper. Firstly, the association matrix of transmission line/traveling wave protection device was established according to the connection relationship between transmission lines and traveling wave protection devices. Secondly, the fault direction could be identified by calculating the square ratio of positive and negative direction traveling wave energy. Then, the fault association matrix could be obtained by the specific determination principle between the recorded fault direction judgment results and the element in the fault association matrix, the fault line was thus determined. Simulation results showed that the proposed method was not only simple and feasible, but also fast and reliable. The fault line still could be correctly identified when the traveling wave protection device failed to start, the reliability and practicability of traveling wave protection were greatly improved.