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35 / 2022-03-03 16:39:18
Effect of HVDC ground electrode discharge interference on hydrogen embrittlement susceptibility of X70/X80 pipeline steels
HVDC, interference, ground electrode, pipeline, hydrogen embrittlement
14. High Voltage Apparatus: Reliability and Maintenance
终稿
Qingsong Liu / Maintenance and Test Center of EHV Power Transmission Company, China southern Power Grid, Guangdong Guangzhou China 510663
Shangmao Hu / electric power research institute,CSG,China,People’s Republic of
Wei Chen / Maintenance and Test Center of EHV Power Transmission Company, China southern Power Grid, Guangdong Guangzhou China 510663
Gang Liu / Maintenance and Test Center of EHV Power Transmission Company, China southern Power Grid, Guangdong Guangzhou China 510663
Jun Deng / Maintenance and Test Center of EHV Power Transmission Company, China southern Power Grid, Guangdong Guangzhou China 510663
Hansheng Cai / Maintenance and Test Center of EHV Power Transmission Company, China southern Power Grid, Guangdong Guangzhou China 510663
Balanced bipolar operation was widely used in the HVDC transmission project in China. Under balanced bipolar operation, DC current of equal magnitude but opposite direction flows through the both poles, making the current on the ground electrode the smallest. However, the DC current on the ground electrode can be very large in the case of monopolar lockout due to equipment failure or natural disaster, which causes DC interference on the pipelines nearby. The ground electrode discharge interference can then lead to a shift of electrode potential of the pipeline to the negative direction, making the pipe-to soil potential more negative than hydrogen reduction potential. This could increase a risk of hydrogen degradation during service, causing unpredictable fracture to the pipelines. In this work, the effect of DC interference generated by HVDC ground electrode discharging on hydrogen embrittlement susceptibility of pipeline was investigated on X70 and X80 steels, which are frequently used as materials for oil and gas pipelines. The simulated negative interferences with different intervals and frequencies were applied on X70 and X80 steel in soil environment and the hydrogen embrittlement susceptibility of X70 and X80 steels was evaluated by means of slow strain rate test (SSRT) and fracture toughness measurement. The results show that the elongation and reduction of area, as well as the fracture toughness, decreased with the increase of interference duration for both X70 and X80 steels, indicating that the hydrogen embrittlement susceptibility increased under negative interference.

 
重要日期

  • 会议日期

    09月25日

    2022

    至

    09月29日

    2022

  • 08月15日 2022

    提前注册日期

  • 09月10日 2022

    报告提交截止日期

  • 11月10日 2022

    注册截止日期

  • 11月30日 2022

    初稿截稿日期

  • 11月30日 2022

    终稿截稿日期

主办单位
IEEE DEIS
承办单位
Chongqing University
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