The UHVDC Transmission Line Lightning Disturbance Identification Based on the Morphology

Abstract:

Research and identify overhead transmission lines’ transient characteristic which was caused by lightning stroke is significant to develop the protection and improving its reliability based on transient state. A complex signal can be resolved into several parts which have respective physical meanings by mathematical morphology’s multi-scale decomposition and this can reveal the local features of waves. Therefore, the transient current of ±800 kV UHVDC transmission lines, caused by the non-fault lightning stroke, fault lightning stroke and other line short circuit, can be decomposed by the multi-scale morphology decomposition to extract the spectral energy from the high and the low frequency bands, and the ratio of those two spectrum energy forms main criterion to realize the identification between lightening disturbance and the fault states. According to the ratio of the maximum of the current’s amplitudes of decomposition waveform of the first head of current’s second scale and sixth scale, to further distinguish the lightning stroke fault from the line short circuit. Extensive simulations show that the approach is correct and effective.

• Periodical: Advanced Materials Research (Volumes 1008-1009)
• Pages: 603-609
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1008-1009.603
• Online since: August 2014
• Authors: Rui Rui Cao, Ju Rui Yang*
• Keywords: Lightening Stroke Fault, Main Criterion, Mathematical Morphology, Spectral Energy, UHVDC Transmission Lines

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