A solid vacuum insulated ring network cabinet and its manufacturing method

Abstract

The invention relates to a solid vacuum insulation ring network cabinet and a manufacturing method thereof. The ring network cabinet comprises a housing, a vacuum interrupter load switch, an isolator, three sets of fuses, a grounding device, a mechanical transmission device, and a bus. The vacuum interrupter load switch consists of an arc-extinguishing-flame-retardant-ceramic-made housing, a fixed power connection unit, a moveable power connection unit and a vulcanized silicone rubber. The arc-extinguishing flame retardant ceramic is further formed in such a way that a nano-alumina fiber is mixed with a silicon dioxide fiber and zirconium dioxide powder under high pressure and dense sintering. The housing is provided with an insulation elastic component, whose end head is connected with a tempered glass joint's elastic element. The gap part utilizes ethyl formate resin for insulation sealing. The isolator is of a three-joint structure with two joints connected with the bus and the other one connected with the grounding device. The solid vacuum insulation ring network cabinet proposed by the invention can realize the operation and linking of circuit disconnection, arc-extinguishing and isolation. The service lifetime of the cabinet is long and it can be used outdoors for a long time. The housing of the vacuum interrupter load switch is not easy to be deformed, does not go rusty and has a low expansion coefficient.

Description

technical field [0001] The present invention and the field of electrical appliances, in particular, relate to a solid vacuum insulated ring network cabinet and a manufacturing method thereof. Background technique [0002] The ring network refers to the ring distribution network, that is, the main power supply line forms a closed ring, and the power supply supplies power to the ring main line, and then distributes power from the main line through high-voltage switches one by one. The advantage of this is that each power distribution branch can get power from its left main line and from its right main line. When the left main fails, it continues to receive power from the right main, and when the right main fails, it continues to receive power from the left main, so that although the main power supply is single, But from each power distribution branch, it can get benefits similar to dual-circuit power supply, thereby improving the reliability of power supply. Ring main unit (...

AI Technical Summary

Problems solved by technology

But on the one hand, because the metal structure is used as the outer casing of the vacuum arc extinguishing load switch in the prior art, there is no other arc extinguishing ability except the vacuum environment, and the metal structure is easy to deform, rust, expand with heat and contract with cold, and the vacuum tightness is not good. Good, and in the conventional technology, the vacuum chamber is sealed with epoxy resin. It is undeniable that its insulation is good, but its softness is easy to age and is relatively brittle, and it is easily damaged by vibration; Opening and closing operations can be realized, but isolation operations cannot be realized, so another isolation structure is required, the operation is troublesome and the linkage operation cannot be realized, and the fault tolerance is low; finally, because metal materials are easy to phase change at high temperatures (the instantaneous temperature during arcing is extremely high) High), the mechanical properties are reduced, and if the paint surface is used for corrosion protection, the paint surface will age and fall off. If the cadmium zinc coating is used for corrosion protection, it is easy to cadmium brittle and zinc brittle, and the service life is short

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