In　practical　engineering,　there　are　combined　air　gaps　formed　by　floating　conductors,　which　exhibit　more　complex　discharge　characteristics　compared　to　air　gaps.　This　paper　conducts　AC　voltage　discharge　experiments　on　floating　conductors　with　different　diameters　and　lengths　under　different　electrode　structures　and　combines　with　electric　field　simulation　for　analysis.　In　the　rod-plane　gap　and　small　sphere-　plane　gap,　the　breakdown　voltage　curves　show　an　initial　increase　followed　by　a　decrease　as　the　floating　conductor　moves　away　from　the　high　voltage　electrode.　For　the　large　sphere-plane　gap,　the　breakdown　voltage　curve　shows　an　increasing　trend,　and　the　phenomenon　of　the　discharge　the　sub-gap　between　floating　conductors　occurs　when　the　conductors　are　near　the　high　voltage　electrode,　thereby　influencing　the　breakdown　voltage.　©　2024　IEEE.