Research on the drying-treatment of heating and nitrogen washing for GIS micro water in the air chamber based on the temperature rise control

ZUO Wen¹, YIMAMUMAIMAITI Waa-fu¹, SHAN De-shuai¹,
SHI Hai-zhen¹, DAI Wei-wei², JIN Li-jun²

                                       (1. National grid Xinjiang power company maintenance company, Urumqi  830000，China;
                                            2. School of electronics and information engineering, Tongji University, Shanghai  201804，China)

Abstract: Aiming at the problem of the micro water in the extra high voltage GIS gas chamber exceeding the standard, which seriously affecting the internal insulation of the equipment and the normal operation of the power system, the scientific and effective treatment for the GIS micro water exceeding problem in the gas chamber was studied. A new drying-treatment of heating and nitrogen washing for 750 kV GIS equipment was researched based on the characteristics of the micro water precipitation of the GIS indoor equipment materials. The drying-treatment was to raise the temperature of gas in the GIS chamber and the precipitation of the micro water. Establishing the heat-fluid-solid coupling model of the drying treatment and calculating the temperature rise of the chamber, which will help the precipitation of the micro water, the feasibility of the drying-treatment is verified based on the Fluent decoupling results. The optimal heating power is designed based on the calculation to control the temperature rise under the allowable value. The results indicate that the drying-treatment of heating and nitrogen washing for GIS micro water exceeding can effectively improve the internal temperature of GIS gas chamber and the precipitation of the micro water. The reoperation times of nitrogen washing is reduced, enhancing the GIS site maintenance efficiency.
Key words: extra high voltage GIS; treatment for micro water exceeding; drying-treatment of heating and nitrogen washing; optimal temperature rise control