An active infrared thermography method for nondestructive testing of porcelain post insulators

##plugins.themes.academic_pro.article.main##

Lishuai Liu
Liming Wang
Hongwei Mei
Zhicheng Guan

Abstract

In recent years, accidents of porcelain post insulators fracture due to their internal defects often occur, which severely endanger the security and stability of the power system. The traditional ultrasonic testing method requires power off, and the effect and efficiency are barely satisfactory. In this study, a novel approach based on active infrared thermography is proposed to test and evaluate the state of porcelain post insulators. More specifically, an external source of energy is employed to heat the specimen being detected and the thermal front propagates through the object. Due to different thermal properties between defective and sound area, the thermal contrast evolution on the surface of the object can be monitored by a thermographic camera. The recorded data are analyzed by image processing technology to yield information about defect size and depth. The validity of the proposed testing method is proved by a series of experiments performed on specimens containing defects of different sizes at different depths. It is concluded that the active infrared thermography testing method is attractive owing to its quick, contactless, full-field imaging and quantitative defect estimation capabilities.

##plugins.themes.academic_pro.article.details##

How to Cite
Liu, L., Wang, L., Mei, H., & Guan, Z. (2017). An active infrared thermography method for nondestructive testing of porcelain post insulators. Power Research - A Journal of CPRI, 7–12. Retrieved from https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/129

References

  1. K. Liang, J. Wang, K. Liu, and L. Wang. “Research of acoustic vibration technique in online defects detection in porcelain post insulator”, 2015 IEEE Magnetics Conference (INTERMAG), 2015.
  2. L. A. B. Lasalvia, M. T. B. Florentino, T. V. Ferreira, A. D. Gennano, and E. G. da Costa, “Intelligent acoustic detection of defective porcelain station post insulators,” in 2015 Electrical Insulation Conference. Seattle, USA, pp. 118-122, 2015.
  3. Y ang Shiming, Tao Wenshuan, Heat Transfer. 4th ed. Beijing, China: Higher Education Press, 2010: 1-2.
  4. Peter von Böckh, and Thomas Wetelz, Heat Transfer – Basics and Practice. New York: Springer-Verlag, 2012, ch. 7.
  5. Manohar, Arun, Francesco Lanza di Scalea, Chung-Bang Yun, and Kon-Well Wang. "Estimation of defect parameters in quasi-isotropic composite materials using infrared thermography", Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2013, 2013.
  6. Clemente Ibarra-Castanedo. “Comparative Study of Active Thermography Techniques for the Nondestructive Evaluation of Honeycomb Structures”, Research in Nondestructive Evaluation, Vol. 20, pp.1-31
  7. Standardization Administration of the People’s Republic of China. GB/T 26643— 2011 Non-destructive Testing—Infrared Flash Thermography—Guideline. Beijing, China: China Standard Press, 2011.
  8. Zeng Zhi, Tao Ning, Feng Lichun, et al. “Effect of defect size on the measurement of defect depth using thermal wave imaging”. Infrared and Laser Engineering, Vol. 41, No. 07, pp, 1910-1915, 2012