546 / 2022-03-29 17:17:08
Phenomenon and Mechanism of Positive Synergistic Effect of SF6/N2 Mixed Gas
SF6,SF6/N2,synergistic effect,Gas discharge,Gas insulation
终稿
Zheng Yu / Wuhan University
SF6/N2 gas mixture has the advantages of being used at low temperature and reducing the amount of SF6 gas, which has been applied in practice. Under some conditions, the breakdown voltage of SF6/N2 mixture may be higher than that of pure SF6, which is called positive synergistic effect. In order to explore the conditions of positive synergistic effect of SF6/N2 mixture, power frequency discharge research is carried out, and the mechanism of positive synergistic effect is revealed in combination with shorter time scale impulse discharge.

The needle plate electrode was used in the experiment, the electrode distance was 10 mm, and the pressure of SF6 gas and SF6/N2 mixed gas was in the range of 0.1~0.4 MPa. Under the power frequency voltage, the change of breakdown voltage of SF6 gas and SF6/N2 mixture with pressure is obtained. Then the pressure and proportion of SF6 was found under which the breakdown voltage of SF6/N2 mixture is higher than SF6 gas. Under this pressure and proportion, lightning impulse experiments were carried out to explore the variation law of positive synergy effect under different voltage time scales. Finally, the positive synergy of SF6/N2 mixture is revealed from the perspective of the influence of space charge on electric field.

It was found that the power frequency breakdown voltage of SF6/N2 mixture is higher than that of pure SF6 gas when SF6 accounts for 30% at 0.2 MPa. While the peak of hump curve of SF6/N2 mixture was also 0.2 MPa. It shows that space charge is the key factor to improve insulation performance of SF6/N2 mixture at 0.2 MPa.

When using SF6/N2 gas mixture in practice, if the absolute pressure is 0.2 MPa, such as in medium and low voltage ring cabinet, its insulation performance will be better than that of pure SF6 gas when protrusion occurs, because space charge will significantly improve its insulation performance.

 
重要日期
  • 会议日期

    09月25日

    2022

    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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