2024-08-01
The difference between casing nipple and casing coupling
Casing pipe is an insulating device that introduces live conductors into electrical equipment or passes through walls. The former is called an electrical casing, and the latter is called a wall casing. The casing structure generally consists of three parts: a conductor (guide rod), an insulator, and a metal flange. The conductor passes through the axis of the cylindrical insulator, and the metal annular flange is installed outside the insulator and used for grounding. The casing is an insulating structure with a strong vertical electric field component. The electric field intensity at the metal flange is very large, which is prone to corona discharge and flash discharge along the surface of the medium. The radial electric field intensity between the flange and the guide rod is also very high, which is prone to breakdown of the insulating medium. In addition to the use of a single solid insulating material for casings of 35kV and below, multiple insulating materials are often used or electric field uniformity measures are taken to make the axial and tangential electric field distribution tend to be uniform.