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| Nonª²Communication Transmission Line Protection
Based on Frequency Spectrum Recognition Kang Xiaoning£¬Suonan Jiale (School of Electrical Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an 710049£¬China£© Abstract£ºThe superimposed voltage component spectrum at fault point is investigated
via Fourier analysis. The result shows that the voltage spectrum ratios between different
frequencies represents the characteristic of superimposed voltage component at fault
point. Furthermore£¬ the relationship between the ratios at fault point and measurement
point is deduced quantitatively to distinguish the internal fault fast from external fault
for the transmission line with line trap. The EMTP simulation shows that£¬ without the
opposite information£¬ the protective relaying based on the proposed principle can
distinguish the internal fault from external fault fast with high sensitivity. |
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