Dry-type all-insulating tubular bus

Abstract

The invention discloses a dry-type all-insulating tubular bus and relates to power generation, transmission, transformation and distribution devices of an electric power system. The dry-type all-insulating tubular bus comprises a hollow conducting tube, a first epoxy resin insulating layer and a first shielding layer, wherein the first epoxy resin insulating layer is coated outside the hollow conducting tube; and the first shielding layer is coated outside the first epoxy resin insulating layer. By using a coaxial capacitance principle and an epoxy resin molding technology, the dry-type all-insulating tubular bus has the advantages of high bus capacity, low volume, energy conservation, maintenance-free performance, safe operation and convenience for large-scale manufacturing.

Description

technical field [0001] The invention relates to power generation, transmission, transformation and distribution devices of a power system, in particular to a novel dry fully insulated tubular busbar. Background technique [0002] With the rapid development of my country's economy, the power supply capacity has increased significantly. The rated current of the low-voltage side of the transformer is also increasing. At present, the capacity of a single 110KV and 220KV transformer reaches 120MVA, the low-voltage side voltage is 6.3-13.8KV, and the working current is as high as 5000A-11000A. At the same time, thermal power generation units with a single capacity of 125MW or less in my country are being gradually shut down. 200MW, 300MW and 600MW generating units have become mainstream power generation equipment, their export voltages are 15.75KV, 18KV and 20KV respectively, and their export currents are 8625A, 11320A and 19000A respectively. [0003] Existing busbars include ...

AI Technical Summary

Problems solved by technology

According to statistics, when this kind of insulated busbar has been in operation for about 3 years, the partial discharge can easily exceed the standard, resulting in frequent accidents such as breakdown, which poses a great threat to the safe operation of the power grid.

[0006] PTFE tape and shielding paper have low tensile and bending strength. This kind of wrapped insulating busbar, because each layer can slide independently, in the deformation of the busbar, the insulating material cannot bear the stress, and the stress in each direction is uneven, which will cause Lead to local deformation, dislocation or even fracture

[0007] 2) The conductive main body of the conventional rectangular busbar is a solid conductor, which has a large skin effect during the working process and a large loss of electric energy during the transmission process, resulting in a significant drop in current-carrying capacity, which seriously affects and restricts the safe operation of the substation

And the heat dissipation performance is not good, the working temperature is high, which will affect the service life and life of the busbar, and the mechanical strength is average.

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