Dry overall shield insulating tubular bus

Abstract

The invention relates to the field of power generation, transmission, transformation and distribution devices of power systems, in particular to a dry overall shield insulating tubular bus which comprises a tubular conductive core. A first semi-conductive shield layer, an insulating layer, a second semi-conductive shield layer, a grounding shield layer and an outer protection layer sequentially wrap the outside of the conductive core from inside to outside, wherein the insulating layer is made of organic silicone rubber. The tubular conductive core is high in capacity and small in size, the insulating layer made of the organic silicone rubber has a fine electrical insulating property, dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity, surface resistivity and the like of the insulating layer are among the best in insulating materials, the electrical performance of the insulating layer is less affected by temperature and frequency, and the organic silicone rubber insulating layer has excellent heat resistance and water repellency, has a certain flexibility after curing, can be bent and can meet use requirements under different conditions.

Description

technical field [0001] The invention relates to the field of power generation, power transmission, power transformation and distribution devices in power systems, in particular to a dry-type fully shielded insulating 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 voltage on the low-voltage side 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 respectiv...

AI Technical Summary

Problems solved by technology

The use of epoxy resin as the insulating layer here has the following disadvantages: 1. After the epoxy resin is cured, the epoxy resin insulating layer becomes hard and brittle, easily damaged by external force and difficult to repair; 2. Insulated tubular busbars made of epoxy resin can no longer be bent. They have a certain shape, and tubular busbars with different bending angles need to be processed as accessories for turning. These angled tubular conductors cannot be processed and insulated by mechanical equipment. Layer, only the insulation layer can be wound by hand, which leads to unstable insulation quality of the product. When installing on site, different bending angles must be selected according to the needs. This is obviously not convenient, and all bending angles cannot be used universally.

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