The use of insulated tube bus in China has a history of nearly 20 years, and it has made a historic contribution to reducing the layout space of the distribution bus and improving the reliability of the bus operation. There are many manufacturers supplying this product, and the production process is uneven, and the difference in the process is mainly reflected in the insulation method, such as PTFE tape-wrapped busbar, silicone rubber extruded busbar, epoxy resin casting busbar, etc.
1. PTFE tape wrapping busbar
This kind of bus is manually bandaged or machine-bandaged, and a multi-capacitive screen composed of PTFE tape and aluminum foil is used to improve the electric field dispersion of the bus bar and improve the dielectric strength. This type of bus has been in operation for more than 10 years, and its skills are relatively mature, but it has high requirements for the production environment and personnel operation.
2. Silicone rubber extruded busbar
This kind of bus is made of silicone rubber as the main insulating material, and the machine is extruded and formed at one time, but it is difficult to realize multiple series capacitive screens. The electric field dispersion of the multi-layer series capacitor screen at the end of the bus is relatively uniform, while the electric field dispersion of the single-layer capacitive screen is uneven, which simply leads to the flashover discharge of the charged body of the bus to the ground screen. The process can only realize the straight section of the extrusion, the curve part is difficult to achieve, the manufacturer is usually the straight line extrusion with the insulation layer together with the bender bending, which will cause damage to the fully insulated tubular bus layer.
3. Epoxy resin casting busbar
This kind of bus bar is similar to the silicone rubber extruded busbar, which is also difficult to achieve multiple series capacitive screens, and it is difficult to achieve vacuum casting, and it is inevitable to bring in air during the pouring process. Epoxy resin is not as flexible as PTFE tape and silicone rubber, and it simply cracks during transportation or operation.
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