Travelling Wave Fault Location for Distribution Line Based on Improved Morphological Gradient Algorithm

when distribution system with non-effectively ground -ed neutral occurs ground fault, the fault current is very small in amplitude, so the faulted location identification accurately is very difficult. To solve this problem, a new algorithm of travelling wave fault location in ddistribution line based on improved morphological gradient is adopted. The algorithm selects transient current travelling wave of prominent fault signal characteristics, to extract the alpha-mode of transient current travelling wave by phase-module transformation and to structure morphological filter to filtrate the alpha-mode. The method of improved morphological gradient extracts the head of this alpha-mode of travelling wave and achieves accurate fault location through the principle of single terminal location. Theoretical analysis and simulation results show that the principle of the algorithm is simple and its calculation is small.