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Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography

Author

Listed:
  • Xing Li

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Fan Yang

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Julan Ming

    (Hangzhou Yineng Electric Technology Co., Ltd., Hangzhou 310014, China)

  • Ammad Jadoon

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Sheng Han

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

Abstract

The corrosion diagnosis of grounding grid can locate the corroded branches and provide guidance for the maintenance and repair of the grounding grid. This paper proposed the electrical impedance tomography (EIT) method on the corrosion diagnosis of grounding grid and described how it works. Firstly, the inverse problem model of the electrical impedance tomography on grounding grid is developed. Secondly, in order to weaken the ill-posedness of the inverse problem, a Newton iterative algorithm with Tikhonov regularization is proposed to solve the problem. Then, due to the high resistivity contrast between the soli and steel and the large size of imaging region, this paper presents the method of soil-separation and block-diagnosis to accomplish these problems. Finally, field experiments were carried out to verify the effectiveness of the proposed method and the results show that the location and degree of the corrosion in the grounding grid can be easily judged from the imaging results.

Suggested Citation

  • Xing Li & Fan Yang & Julan Ming & Ammad Jadoon & Sheng Han, 2018. "Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography," Energies, MDPI, vol. 11(7), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1739-:d:155896
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    References listed on IDEAS

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    1. Jae Woo Ko & Hae Lim Cha & David Kwang-Soon Kim & Jong Rok Lim & Gyu Gwang Kim & Byeong Gwan Bhang & Chang Sub Won & Han Sang Jung & Dong Hyung Kang & Hyung Keun Ahn, 2017. "Safety Analysis of Grounding Resistance with Depth of Water for Floating PVs," Energies, MDPI, vol. 10(9), pages 1-12, September.
    2. Ying Zhu & Yuping Li & Jianbin Sang & Minglei Bao & Haixiang Zang, 2018. "Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection," Energies, MDPI, vol. 11(6), pages 1-15, June.
    3. Fan Yang & Yongan Wang & Manling Dong & Xiaokuo Kou & Degui Yao & Xing Li & Bing Gao & Irfan Ullah, 2017. "A Cycle Voltage Measurement Method and Application in Grounding Grids Fault Location," Energies, MDPI, vol. 10(11), pages 1-18, November.
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    Cited by:

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