Switchgear

A technology of switch mechanism and switch part, which is applied in the direction of electric switch, switch device, switch device setting, etc., can solve the problems of SF6 gas leakage, high probability, and increased usage of SF6 gas, and achieve the goal of reducing usage and leakage Effect

Active Publication Date: 2017-08-29
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the switch described in the above-mentioned Patent Document 1, the openings at both ends of the electrical insulator constituting the container are sealed by sealing materials such as metal flanges and O-rings to prevent internal SF6 gas from leaking. However, due to the O-ring The probability of passing through a small amount of SF6 gas is high, so it is possible to leak a small amount of SF6 gas into the atmosphere during the product life span of several decades
In addition, since SF6 gas is enclosed in the entire container, there is a problem that the amount of SF6 gas used increases.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0047] use figure 1 and figure 2 Example 1 will be described. As shown in the figure, in the gas circuit breaker of Embodiment 1, a fixed electrode 3 is arranged inside an arc extinguishing chamber composed of a ceramic insulating cylinder 7, a fixed end plate 9, a movable end plate 10, and a bellows 2, and The spring contact 23, the movable electrode 5, and the gas valve 28 formed by enclosing SF6 gas through the port 14a, the sleeve conductors 12A, 12B, and the electric field relaxation shield 8 are made of a solid insulator 21 such as epoxy resin. Perform molding. If necessary, the outer surface of the solid insulator 21 may be coated with conductive paint or the like to be at ground potential. In addition, the movable electrode 5 is driven so that it can be freely contacted and detached from the fixed electrode 3 by the two-position electromagnetic operator 29 via the insulating operating rod 20 and the control rod 31 . The insulating operating rod 20 is arranged in a...

Embodiment 2

[0052] Next, use image 3 Example 2 will be described. In the gas circuit breaker of Embodiment 2, a fixed electrode 3, a movable electrode 5, and the gas valve 28 and the bushing conductors 12A, 12B, which are formed by sealing SF6 gas inside through the port 14a, are molded with a solid insulator 21 such as epoxy resin. If necessary, the outer surface of the solid insulator 21 may be coated with conductive paint or the like to be at ground potential. Other than that, it is comprised similarly to Example 1.

[0053]In this structure, the gas valve 28 is formed by mutual injection molding of the solid insulating cylinder 22, the fixed end plate 9, and the movable end plate 10 made of epoxy resin or the like, and solid insulation such as epoxy resin is used around it. Therefore, similar to Example 1, compared with the sealing structure of the O-ring, the leakage of the SF6 gas sealed inside is reduced, and the environmental suitability is high. In addition, it is only neces...

Embodiment 3

[0055] Next, use Figure 4 Example 3 will be described. In Example 3, in addition to the structure of Example 1, as shown in the figure, a solid insulating cylinder 22 and a piston 24 are arranged in the gas valve 28, and are also arranged in such a way that the central axis of the movable electrode 5 penetrates to the back of the piston 24 Through hole 25. Arc resistant metal 26 is provided on the surface of fixed electrode 3 .

[0056] In this structure, when the movable electrode 5 is driven from the ON position to the OFF position, as the volume of the space surrounded by the solid insulating cylinder 22, the piston 24, and the movable side end plate 10 decreases, the volume of the space in the space decreases. The pressure of the gas rises, and the gas is discharged from the front end of the movable electrode 5 through the through hole 25 . This gas is blown toward the arc that strikes between the movable electrode 5 and the fixed electrode 3 , thereby improving the cu...

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PUM

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Abstract

The purpose of the present invention is to provide a switch capable of preventing SF6 gas leakage and reducing SF6 gas usage. To address this problem, the present invention is characterized by being provided with an arc-extinguishing chamber having an insulation tube, a fixed end plate provided at one end of the insulation tube, a mobile end plate provided at the other end of the insulation tube, a fixed electrode provided to the fixed end plate, a mobile electrode that is provided so as to penetrate the mobile end plate and is mobile, a bellows provided to the mobile end plate and mobile electrode, and a supply and discharge port for supplying and discharging gas, a first bushing conductor electrically connected to the fixed electrode, and a second bushing conductor electrically connected to the mobile electrode and in that the arc-extinguishing chamber, first bushing conductor, and second bushing conductor are made to be a switching unit molded from a solid insulator.

Description

technical field [0001] The present invention relates to switching equipment for receiving and distributing power, in particular to the structure of a circuit breaker, a load current switch, a grounding switch, a grounding circuit breaker, a switching device, and a switch for multi-circuit switching. Background technique [0002] An example of a conventional switch mechanism will be described using the structure of a switch described in Patent Document 1. FIG. The switch is constructed by arranging fixed electrodes, movable electrodes, current collectors, insulating operating rods, bushing conductors, etc. in a container made of electrical insulators, and enclosing an insulating gas such as SF6 gas inside. [0003] In this structure, the openings at both ends of the electrical insulator constituting the container are sealed with sealing materials such as metallic flanges and O-rings to prevent leakage of SF6 gas inside. In addition, SF6 gas is sealed in the entire container....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02B13/035H01H33/16H01H33/64H01H33/662H01H33/664H02B13/055H02B13/065H02B13/075
CPCH01H33/64H01H33/16H01H33/53H01H33/662H01H85/2045H01H85/42H01H2033/6623H02B13/0354
Inventor 佐藤隆土屋贤治森田步矢野真
Owner HITACHI IND EQUIP SYST CO LTD
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