For closed bus ducts, pay attention to the sealing performance of the welding joints.

Since most of the connections of the closed bus duct are welded, and the outer casing is made of aluminum, the aluminum plate easily reacts with oxygen, forming a dense and refractory oxide film on its surface, and the specific gravity of the oxide film is also large, making it difficult to Leaking out of the molten pool and forming weld slag inclusions; because the closed bus duct is very long, it is impossible to weld directly before leaving the factory and needs to be transported in sections to the site for welding and assembly.

Liquid aluminum can dissolve a large amount of hydrogen, but solid aluminum hardly dissolves hydrogen. When the molten weld metal is rapidly cooled and solidified, hydrogen has no time to precipitate and easily accumulates in the weld to form pores. Factors such as a humid welding environment will also affect the sealing of the weld. performance.

Under normal circumstances, the power supply for operating the switch blades in the switchgear control cabinet is in the off position. The power supply must be turned on before operating the switch blades, and the power supply must be disconnected promptly after the operation is completed. Bumps and collisions along the way will cause the seal to deform, making it impossible to fit it tightly during installation. Glue should not be applied inside the seal, asbestos pads should not be installed, and sealing rings should not be installed.

Before operating the bus coupler switch, attention should be paid to bus reverse switching. Before pulling the bus coupler circuit breaker, check again whether all circuits have been reversed to another bus section.

During the use of closed bus ducts, condensation is easy to occur outdoors. This will affect normal use for a long time. Therefore, a configuration is required to ensure normal work and avoid unnecessary problems. Black spots caused by high temperatures during welding should be cleaned up in time, and stainless steel wire brushes should be used for interlayer cleaning.