A vacuum switch module for nitrogen insulated ring main unit

Abstract

The invention provides a vacuum switch module for a nitrogen insulated ring main unit. The layout and installation of the vacuum switching module in the nitrogen insulated ring main unit are greatly optimized, and a small-sized and compact vacuum switch is provided under the premise of satisfying insulation and temperature rising requirement. The vacuum switch module comprises a vacuum arc extinguish chamber, a metal mounting frame, an insulating supporting plate, a supporting column insulator, a fixed frame and a contact spring system, wherein the insulating supporting plate is horizontally fixed at the upper part of the metal mounting frame; the upper end of the vacuum arc extinguish chamber is perpendicularly fixed on the lower part of the insulating supporting plate while the lower end is fixedly arranged on the fixed frame; the fixed plane of the metal mounting frame and the insulating supporting plate is lower than the upper plane where the vacuum arc extinguish chamber and the insulating supporting plate are fixed; the contact spring system is mounted in the fixed frame and used for connecting a movable contact of the vacuum arc extinguish chamber to supply operating power; and one end of the supporting column insulator is fixed on one side of the metal mounting frame while the other end is fixed on the fixed frame.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to a vacuum switch module for a nitrogen-insulated ring network cabinet. Background technique [0002] Nitrogen insulated ring network cabinet compared to traditional SF 6 The gas insulated ring network cabinet is environmentally friendly and is considered to be the future SF 6 Alternatives to ring main units. Since nitrogen or dry air are not as insulating as SF 6 , so the volume of the nitrogen insulated ring main unit is smaller than that of the SF 6 The ring network cabinet is slightly larger. In order to make the volume of the nitrogen insulated ring main unit smaller, it is necessary to design a compact switch, which not only needs to arrange the components and devices reasonably, but also meets the performance requirements such as insulation and temperature rise. [0003] In the prior art, most nitrogen-insulated or dry-air-insulated ring networ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, most nitrogen-insulated or dry-air-insulated ring network cabinets adopt an embedded pole structure, which requires high sealing technology and cost, and once there is an air gap at the epoxy interface, it is easy to appear at the air gap. corona

Moreover, the hidden danger of cracking of the solid-sealed pole is also not conducive to the realization of the maintenance-free inflatable cabinet

In addition, considering the performance of insulation and temperature rise, the size and cost of this type of ring network cabinet cannot be reduced, and it is difficult to reduce the cost compared with SF 6 The competitive advantage of the ring network cabinet is not strong

[0004] On the other hand, in the current technology of inflatable ring network cabinets, the vacuum interrupter is generally fixed by an insulating splint structure on both sides. This structure has poor strength of the insulating plate when the contact pressure is high, and the drive shaft is inconvenient to install. and fixed, and the phase-to-phase insulation is difficult, and the overall installation and fixation of the vacuum switch is inconvenient

There is also a side-mounted structure in the existing technology, and the upper and lower ends of the arc extinguishing chamber are fixed on one side with insulators on one side. When the contact pressure is high in this structure, it is easy to tilt to one side, which affects the normal operation of the switch. performance; in addition, it takes up space above the switchgear and increases the size of the switchgear

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