| Transient based protection uses transient fault components to realize the protection. It can do well in settling the conflict between speediness and reliability in traditional protection for EHV transmission line. Started from theory of Mathematical Morphology and transient protection, several aspects of transient protection are displayed in this thesis, this paper discusses MM principle and its applications in signal filter technique. Through detecting and enlarging the contract between different dimensions by Multi-scale Morphological analytical, construct a novel non-unit transient current protection scheme. Based on analyzing the characteristics of modulus components of different types of faults occurred in EHV transmission lines, a transient fault phase selection algorithm is also presented, using both Lipschitz and Mathematical Morphology. A simplified 500kV transmission line is simulated using ATP, and the algorithm is verified by MATLAB, the simulation results prove the algorithms are correct and reliable. |
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