# 방사전자파를 이용한 고분자애자의 오손량 분류기법

• 박재준 (중부대학교 전기전자공학과)
• Published : 2006.02.01

#### Abstract

Recently, diagnosis techniques have been investigated to detect a Partial Discharge associated with a dielectric material defect in a high voltage electrical apparatus, However, the properties of detection technique of Partial Discharge aren't completely understood because the physical process of Partial Discharge. Therefore, this paper analyzes the process on surface discharge of polymer insulator using wavelet transform. Wavelet transform provides a direct quantitative measure of spectral content in the time~frequency domain. As it is important to develop a non-contact method for detecting the kaolin contamination degree, this research analyzes the electromagnetic waves emitted from Partial Discharge using wavelet transform. This result experimentally shows the process of Partial Discharge as a two-dimensional distribution in the time-frequency domain. Feature extraction parameter namely, maximum and average of wavelet coefficients values, wavelet coefficients value at the point of $95\%$ in a histogram and number of maximum wavelet coefficient have used electromagnetic wave signals as input signals in the preprocessing process of neural networks in order to identify kaolin contamination rates. As result, root sum square error was produced by the test with a learning of neural networks obtained 0.00828.

#### References

1. F. Amarh, G. G. Karady, and R. Sundrarajan, 'Linear stochastic analysis of polluted insulator leakage current', IEEE Transactions on Power Delivery, Vol. 17, p. 1063, 2002
2. J. J. Park, Y. C. Song, and D. H. Choi, 'A flashover prediction method for contaminated insulators using a stochastic analysis of leakage current', Jpn. J. Appl. Phys., Vol. 43, No. 5A, p. 2693, 2004 https://doi.org/10.1143/JJAP.43.2693
3. M. Sato, A. Nakajima, and T. Komukai, 'Spectral analysis of leakage current on contaminated insulators by auto regressive method', IEEE, p. 64, 1998
4. A. H. El-Hag, S. H. Jayaram, and E. A.Cherney, 'Influence of shed parameters on the aging performance of silicone rubber insulators in salt-fog', IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 10, p. 655, 2003 https://doi.org/10.1109/TDEI.2003.1219650
5. M. Kawada, M. Wada, Z.-I. Kawasaki, and K. Matsu-ura, ' Time-frequency analysis of partial discharge phenomena in SF6 gas using wavelet transform', T. IEEE Japan, Vol. 117-B, No.3, p. 338, 1997

#### Cited by

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