Solid-insulation vacuum ring main unit

Abstract

The invention provides a solid-insulation vacuum ring main unit, which is structurally characterized in that a standard cable head and a standard silicon rubber dry type bus are mounted on a vacuum switch unit in a unit body through a screw, wherein the standard cable head and the standard silicon rubber dry type bus are respectively mounted on a cable plug and a bus plug of an immobilized post terminal. The solid-insulation vacuum ring main unit has the advantages that a three-station vacuum arc extinguish chamber is adopted and has three working positions including switching-on, brake separation and isolation, and grounding, so that the structure of the switch is simplified; harmful substances is not generated in a working process, thus being environment-friendly; all electrified bodies are cast or mounted in epoxy resin and influences on an electric performance of the ring main unit caused by an external environment are avoided, so that the maintenance of equipment is reduced and the service life is prolonged. All the electrified bodies are cast or mounted in the epoxy resin, a semiconductor substance is sprayed at the outer part of the epoxy resin at the part where induced voltage is possibly generated and the induced voltage is grounded by the substance, so that even if people contact with the substance, the electric shock danger is not generate; and therefore, the solid-insulation vacuum ring main unit is safe.

Description

technical field [0001] The invention is a novel solid insulation ring network cabinet. It belongs to the technical field of high-voltage power distribution equipment. Background technique [0002] At present, most of the ring network cabinets are gas-insulated ring network cabinets. SF6 gas is used as the insulation or breaking medium of the high-voltage live part. Since SF6 gas will decompose and produce toxic gas after it is disconnected, and it is easy to leak, the sealing requirements for the box are high and the processing technology is complicated, which makes the maintenance and testing of the gas-insulated ring network cabinet more complicated, and regular leak detection and gas replenishment are required. In addition, according to the "Kyoto Protocol", as the insulation or breaking medium of the gas-insulated ring main unit, SF6 gas is clearly listed as one of the greenhouse gases, and its use is required to be reduced. Contents of the invention [0003] The pr...

AI Technical Summary

Problems solved by technology

Since SF6 gas will decompose and produce toxic gas after it is disconnected, and it is easy to leak, the sealing requirements of the box are high and the processing technology is complicated, which makes the maintenance and testing of the gas-insulated ring main unit more complicated, and regular leak detection and gas replenishment are required

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