摘要：Accurate fault classification and localization are the bases of protection for transmission systems.
This paper presents a new method for classifying and showing location of faults by travelling waves
and modal analysis. In the proposed method, characteristics of different faults are investigated using
Clarke transformation and initial current traveling wave; then, appropriate indices are introduced to
identify different types of faults. Continuous wavelet transform (CWT) is employed to extract
information of current and voltage travelling waves. Fault location and classification algorithm is
being designed according to wavelet transform coefficients relating to current and voltage modal
components. The performance of the proposed method is tested for different fault conditions (different
fault distance, different fault resistances, and different fault inception angles) by using PSCAD and
MATLAB with satisfactory results.
