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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 361517, 9 pages
http://dx.doi.org/10.1155/2012/361517
Research Article

Resonant Frequency Calculation and Optimal Design of Peano Fractal Antenna for Partial Discharge Detection

State Key Laboratory of Power Transmission Equipment & System and New Technology, Chongqing University, Chongqing 400044, China

Received 23 January 2012; Revised 3 May 2012; Accepted 17 May 2012

Academic Editor: Harish Rajagopalan

Copyright © 2012 Jian Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ultra-high-frequency (UHF) approaches have caught increasing attention recently and have been considered as a promising technology for online monitoring partial discharge (PD) signals. This paper presents a Peano fractal antenna for UHF PD online monitoring of transformer with small size and multiband. The approximate formula for calculating the first resonant frequency of the Peano fractal antenna is presented. The results show that the first resonant frequency of the Peano fractal antenna is smaller than the Hilbert fractal antenna when the outer dimensions are equivalent approximately. The optimal geometric parameters of the antenna were obtained through simulation. Actual PD experiments had been carried out for two typically artificial insulation defect models, while the proposed antenna and the existing Hilbert antenna were both used for the PD measurement. The experimental results show that Peano fractal antenna is qualified for PD online UHF monitoring and a little more suitable than the Hilbert fractal antenna for pattern recognition by analyzing the waveforms of detected UHF PD signals.