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The Mechanism and Diagnosis of Insulation Deterioration Caused by Moisture Ingress into Oil-Impregnated Paper Bushing

Author

Listed:
  • Bo Qi

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Chang Ping District, Beijing 102206, China)

  • Quanmin Dai

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Chang Ping District, Beijing 102206, China)

  • Chengrong Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Chang Ping District, Beijing 102206, China)

  • Zipeng Zeng

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Chang Ping District, Beijing 102206, China)

  • Mingli Fu

    (Electric Power Research Institute of China Southern Power Grid, Guangzhou 510530, China)

  • Ran Zhuo

    (Electric Power Research Institute of China Southern Power Grid, Guangzhou 510530, China)

Abstract

The healthy state of insulation in oil-impregnated bushings is traditionally evaluated by tanδ and capacitance at power frequency and mostly at 10 kV in the test standard. However, there has frequently been insulation accidents induced by moisture ingress (MI) for bushings that have passed the standard. The mechanism and new diagnostic features for MI into bushings were not distinct enough and an accurate test method is urgently needed research. To address this technical gap, a bushing model with a transparent sheath was designed and an ultrasonic humidifier device was adopted to simulate the environment of MI in bushings and recorded by digital camera. The parameters of dielectric dissipation factor, capacitance, partial discharge (PD), frequency domain response, and moisture content in oil were measured at room temperature with time. The results presented that both the increment dissipation factor at low frequency of 0.001 Hz and the increment dissipation factor of 1.2 U m could be used for detecting the earlier insulation defect of oil-impregnated paper (OIP) bushings. The phase resolved partial discharge (PRPD) can serve as the diagnostic basis of the severe state (S 3 ) of insulation deterioration caused by MI into bushings around the phases of 0–117°, 151–303°, and 325–360°. The research findings would provide a useful reference for the condition diagnosis and maintenance of OIP bushings. Especially, the increment detection of Frequency Domain Spectroscopy (FDS) at the frequency of 1 mHz and 10 kHz was recommended firstly for the operative bushings in real sites.

Suggested Citation

  • Bo Qi & Quanmin Dai & Chengrong Li & Zipeng Zeng & Mingli Fu & Ran Zhuo, 2018. "The Mechanism and Diagnosis of Insulation Deterioration Caused by Moisture Ingress into Oil-Impregnated Paper Bushing," Energies, MDPI, vol. 11(6), pages 1-12, June.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1496-:d:151348
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    Citations

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    Cited by:

    1. Mingxi Zhu & Liming Wang & Fanghui Yin & Masoud Farzaneh & Hongwei Mei & Lu Wen, 2018. "The Effect of a Vertical Electric Field on the Surface Flashover Characteristics of a Bushing Model," Energies, MDPI, vol. 11(6), pages 1-14, June.
    2. Krzysztof Walczak & Jaroslaw Gielniak, 2021. "Temperature Distribution in the Insulation System of Condenser-Type HV Bushing—Its Effect on Dielectric Response in the Frequency Domain," Energies, MDPI, vol. 14(13), pages 1-18, July.
    3. Jiansheng Li & Zhi Li & Judong Chen & Yifan Bie & Jun Jiang & Xiaoping Yang, 2021. "Oil Pressure Monitoring for Sealing Failure Detection and Diagnosis of Power Transformer Bushing," Energies, MDPI, vol. 14(23), pages 1-17, November.
    4. Pawel Zukowski & Konrad Kierczynski & Przemyslaw Rogalski & Vitalii Bondariev & Marek Zenker & Rafal Pajak & Marek Szrot & Pawel Molenda & Tomasz N. Koltunowicz, 2024. "Analysis of the Influence of Insulation Moisture during Long-Term Exploitation of Transformers on Their Reliability as Determined by Alternating Current Electrical Parameters," Energies, MDPI, vol. 17(8), pages 1-23, April.
    5. Zhonghuan Su & Longfu Luo & Jun Liu & Zhongxiang Li & Hu Luo & Haonan Bai, 2022. "The Study of VFTO Distribution in the Insulation System of IOCT Used in Traction Network," Energies, MDPI, vol. 15(2), pages 1-13, January.
    6. Tomasz N. Kołtunowicz & Konrad Kierczynski & Pawel Okal & Aleksy Patryn & Miroslav Gutten, 2022. "Diagnostics on the Basis of the Frequency-Temperature Dependences of the Loss Angle Tangent of Heavily Moistured Oil-Impregnated Pressboard," Energies, MDPI, vol. 15(8), pages 1-14, April.

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