Gas-insulated metal enclosed transmission line(GIL)is a kind of high-voltage power transmission equipment that can overcome the complex environmental constraints of transmission corridors and realize large-capacity transmission in urban centers.GIL mainly includes three-pillar insulators,particle catchers,shells,and conductors,etc.As one of the key components of GIL,the three-pillar insulator's electrical performance and mechanical strength directly affect the operational stability of GIL.Starting from the overall structural design of GIL,the optimization design process of the three-pillar insulator of 550 kV GIL is discussed in detail,and the electric field of the three-pillar is simulated and analyzed based on electromagnetic field theory.By introducing the concept of"electric field area"and comparing the area size of the three-pillar with different sizes under the electric field intensity step along the surface,the optimal structure is derived.The design solves the problem of the three-pillar insulators discharging along the surface and provides a reference for the development and application of GIL.
Gas-insulated metal enclosed transmission line(GIL)Three-pillar insulatorsElectrical performanceMechanical strengthDischarge along surfaceElectric field area
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