Lightweight Structure Design of Oil Pit Flame Retardant Layer for Electrical Equipment in Ultra-high Voltage Substation
In view of the problems,such as poor oil discharge,environmental impact and inconvenient cleaning and main-tenance,existing in the practical application of pebble materials used in the field of electrical equipment oil pit flame re-tardant in China,this paper comprehensively considers the requirements of permeability,fire insulation and lightweight of the flame retardant layer of oil pit in ultra-high voltage(UHV)substation,and proposes a lightweight structural design method for the flame retardant layer of oil pit in UHV substation.The floating hollow metal ball is used as a lightweight flame retardant material to be laid at the bottom of the oil pit,and the lightweight flame retardant partition at the top is used to form a lightweight flame retardant layer.On this basis,the key parameters of the hollow metal ball are designed and calculated.The experimental results show that the lightweight flame retardant layer structure proposed in this paper can not only form a flame retardant and fire insulation layer on the surface of transformer oil,greatly suppress the flame in the oil pit,but also facilitate fast discharge of transformer oil in the accident oil pit.