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Proceedings Paper

Wavelet transform-based fault diagnosis and line selection method of small current grounding system
Author(s): Ni Yang; Shuqing Zhang; Liguo Zhang; Kexin Zhang; Lingyun Sun
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Paper Abstract

Small current grounding system is the system that the neutral point doesn't ground or grounds across the arc suppressing coils, which has been applied commonly in distribution system of many countries. As the grounding fault occurs, current is the one caused by capacity of circuit to ground only and it is rather small. The status of fault is complexity, e.g., the electromagnet interferes together with the amplified impact of zero-order loops to high-order singularity waves and various temporary variables. All these result in the lower ratio of the fault element signal to noise caused by zero-order current. In this paper, the position of signal singularity and the magnitude of the singularity degree are analyzed based on the variable focus character of wavelet, and the time fault occurs is then determined. The series db wavelet with close sustain is adopted, and the line selection is according to the zero-order voltage of the generatrix and the current of various outlet line. It is proved by the experiment that the fault circuit diagnosis method based on wavelet analysis to the character of temporary status of single-phase grounding fault plays an important role to a finer line selection.

Paper Details

Date Published: 31 December 2008
PDF: 6 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71304W (31 December 2008); doi: 10.1117/12.819736
Show Author Affiliations
Ni Yang, Yanshan Univ. (China)
Shuqing Zhang, Yanshan Univ. (China)
Liguo Zhang, Yanshan Univ. (China)
Kexin Zhang, Yanshan Univ. (China)
Lingyun Sun, Yanshan Univ. (China)

Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)

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