Gas circuit breaker

A gas circuit breaker and airtight box technology, which is applied to high-voltage air circuit breakers, circuits, electrical components, etc., can solve the problems of surface damage and damage of the insulating operating rod, and the decrease of the surface resistance of the insulating operating rod, so as to meet the requirements of insulation performance, cost reduction effect

Active Publication Date: 2015-02-25
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glass fiber of the insulating operating rod made of GFRP may be damaged by the decomposition gas such as HF gas, or the mechanical strength of the glass fiber of the insulating operating rod may be reduced.
In addition, it is known that the surface resistance of the insulating operating rod decreases due to the influence of the conductive substance produced by the reaction between the glass fiber and the decomposition gas, and eventually the surface of the insulating operating rod is destroyed.

Method used

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  • Gas circuit breaker
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] figure 1 is a longitudinal sectional view showing the structure of the gas circuit breaker, figure 1 An example of a gas circuit breaker to which the gas blocking member according to Embodiments 1 to 5 of the present invention can be applied is shown in . figure 2 It is a figure which shows the gas blocking member concerning Embodiment 1 of this invention. figure 1 The airtight box 1 shown is filled with SF 6 Insulating arc extinguishing gas 2, the gas jet breaking part 7 for cutting off the current is composed of: a fixed contact 8 electrically connected to the fixed side frame 5, and a movable contact 11 opposite to the fixed contact 8 on the same axis , an air spray cylinder 9, an insulator nozzle 12 fixed to the air spray cylinder 9, and a piston 13 fixed to the movable side frame 4.

[0024] The movable side frame 4 is supported by an insulating support cylinder 3 provided inside the airtight case 1 , and the fixed side frame 5 is supported by the movable side ...

Embodiment approach 2

[0040] image 3 It is a figure which shows the gas blocking member concerning Embodiment 2 of this invention. The difference from Embodiment 1 is that the annular member 24 is provided between the opening end side end surface 26d and the axial end surface 10c. Hereinafter, the same reference numerals are assigned to the same parts as those in Embodiment 1, and descriptions thereof will be omitted, and only different parts will be described here.

[0041] The annular member 24 is in the shape of an annular plate, and the inner diameter of the inner peripheral surface 24 a is formed to be larger than the diameter of the small diameter portion 10 a and smaller than the inner diameter D1 of the rod 18 . The outer diameter of the outer peripheral surface 24 b of the annular member 24 is formed to a size larger than the outer diameter D3 of the rod 18 , for example. The thickness T1 of the annular member 24 is formed to be a size smaller than the size of the gap W. As shown in FIG...

Embodiment approach 3

[0045] Figure 4 It is a figure which shows the gas blocking member concerning Embodiment 3 of this invention. The difference from Embodiment 2 is that an annular member 24 - 1 is provided instead of the cylindrical member 26 and the annular member 24 . Hereinafter, the same reference numerals are assigned to the same parts as those in Embodiment 2, and their descriptions are omitted, and only the different parts will be described here.

[0046] The annular member 24-1 is made of, for example, an elastic material (fluororesin, etc.) that is less elastic than the rod 18, and the inner diameter of the inner peripheral surface 24a-1 is formed to be substantially the same as the diameter of the outer peripheral surface 10a2 of the small-diameter portion 10a. size. The outer diameter of the outer peripheral surface 24b - 1 of the annular member 24 - 1 is formed to a size larger than the outer diameter D3 of the rod 18 . The thickness T2 of the annular member 24 - 1 is formed to ...

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Abstract

A piston rod includes a large-diameter portion that is formed on the side of a movable contact, and a small-diameter portion that is formed on the side of an insulating operation rod relative to the large-diameter portion, and that is formed with an outer diameter smaller than the inner diameter of an inner peripheral surface of an insulating cylindrical member. The insulating cylindrical member includes a cylindrical portion that is interposed between the outer peripheral surface of the small-diameter portion and the inner peripheral surface of the insulating operation rod, a bottom portion that is arranged opposed to the distal end of the small-diameter portion, and a through hole through which a coupling pin is inserted through the piston rod and the insulating operation rod.

Description

technical field [0001] The invention relates to the use of sulfur hexafluoride (SF 6 ) and other insulating gas to cut off the current gas circuit breaker. Background technique [0002] In a general gas circuit breaker, it is necessary to use a material excellent in both electrical insulation and mechanical strength for an insulating operating lever for supporting or driving a gas jet circuit breaker. If a resin material with good electrical insulation is used alone as an insulating material, it is difficult to obtain the required mechanical strength. Therefore, fiber-reinforced plastic (FRP) obtained by impregnating fibers in resin is generally used as an insulating operating rod. s material. In particular, among various fiber-reinforced plastics, glass-fiber-reinforced plastics (GFRP) are often used for insulating operating rods from the viewpoint of good manufacturability and processability. [0003] However, in SF 6 Active SF is generated when it is decomposed by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/42
CPCH01H33/64H01H33/42H01H33/565H01H33/021H01H2033/426
Inventor 芳友雄治落合石典吉田大辅
Owner MITSUBISHI ELECTRIC CORP
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