Title :
A combined and improved fault line selection method for non-solidly earthed network
Author :
Feng, Zhang ; Jun, Liang ; Jiangxia, Feng
Author_Institution :
Sch. of Electr. Eng., ShanDong Univ., Jinan, China
Abstract :
Based on the traveling wave theory, the process of transient traveling wave in non-solidly earthed network has been analyzed. The analysis discovers that the traveling waves in the healthy lines are mainly composed of the refracted traveling waves at the bus bar, which are generated from the backward traveling wave of the fault line, then the energy of the refracted traveling waves is the main portion of that in the healthy lines; the energy of the transient traveling waves in fault line is much more than that in the healthy lines, and a thought that peak values are used to express the traveling wave energy is proposed. Considering the complicated conditions in practical field, line selection error may occur only using one criterion, especially in high resistance fault and zero crossing fault. Fractal theory has the superiority in signal fluctuation detection, a combined criteria based on energy of traveling wave and fractal theory is composed in this paper. The ATP simulation shows that the combined criteria improves the robustness, and has high adaptability.
Keywords :
busbars; earthing; fault diagnosis; fractals; power transmission lines; signal detection; ATP simulation; backward traveling wave; busbar; fault line selection method; fractal theory; nonsolidly earthed network; refracted traveling waves; signal fluctuation detection; transient traveling wave; traveling wave energy; traveling wave theory; Educational institutions; Fractals; Power systems; Resistance; Simulation; Transient analysis; energy of traveling waves; fault line selection; fractal theory; non-solidly earthed network;
Conference_Titel :
Innovative Smart Grid Technologies - Asia (ISGT Asia), 2012 IEEE
Conference_Location :
Tianjin
Print_ISBN :
978-1-4673-1221-9
DOI :
10.1109/ISGT-Asia.2012.6303308