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Gas-insulated switching device

A gas-insulated switch and gas technology, which is applied to the installation of switchgear with metal casings, electric switches, electrical components, etc., can solve the problem of the reduction of insulation endurance of insulating operating rods, hindering the miniaturization of switches, and the reduction of insulation endurance, etc. Problems, to achieve the effect of excellent decomposition of gas, reduction of residual stress, and improvement of insulation endurance

Active Publication Date: 2011-09-14
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if FRP is mixed into the resin used in the hollow fiber during manufacture, the insulation resistance of the insulating operating rod will be significantly reduced; due to the decomposition gas intruding into the glass fiber, the performance will deteriorate over time, so its insulation Endurance is reduced, so the realization of hollow fiber FRP and the improvement of coating technology can solve the problem
[0006] However, in the conventional gas insulated switchgear, when the arc movement structure of the above-mentioned insulating operating rod is adopted, since a small gap is generated between the insulating operating rod made of FRP and the high-voltage electrode or the grounding electrode, the Concentrated electric field, easy to form insulation weakness
It is considered that in order to improve this situation, generally, the surroundings of the small gap are covered with a shield for electric field relaxation, but this shield for electric field relaxation hinders the miniaturization of the entire switch.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] figure 1 It is a cross-sectional view of a circuit breaker as a gas insulated switchgear showing an embodiment of the present invention;

[0041] In the interior of the closed container 1 that is sealed with pressurized nitrogen, dry air, SF6 gas, etc., to achieve ground contact, in the state of electrical insulation from the sealed container 1 through the insulating spacers 4, 5, the support height Voltage conductors 2,3.

[0042] On the central conductor 6 of the insulating spacer 4 , a fixed-side contact 7 is mounted, and a shield case 8 for electric field relaxation is provided on the outer periphery of the fixed-side contact 7 . In addition, a movable side contact 11 is attached to the center conductor 9 of the insulating spacer 5 via a movable side cylindrical conductor 10 , and a shield case 12 for electric field relaxation is provided on the outer...

Embodiment 2

[0094] Figure 15 and Figure 16 It is a plan view and a cross-sectional view of the contact connection structure between the insulating operating rod 14 and the movable part 13 of another embodiment.

[0095] The structure of the contact surface 21 on the free end side of the insulating operating rod 14 is the same as that in the above case. In addition, the movable member 13 has a holding portion 29 connected to the insulation operating rod 14 on the right, unlike the conductor portion on the left for conducting electricity. Hold section 29 has a pass Figure 13 The illustrated through hole 27 is detachably fixed to the conductor portion by means of a screw thread 30 .

[0096] because the elephant also according to Figure 11 As known from the relationship between the movable part 13 and the movable side contact 11, no current flows in the holding part 29 which is independent of the conductor part, so its constituent material can be either a metal material or an insulat...

Embodiment 3

[0100] Figure 17 and Figure 18 It is a plan view and a cross-sectional view showing the contact connection structure of the insulating operating rod 14 and the movable member 13 in another embodiment.

[0101] The example is with Figure 15 and Figure 16 In the same contact connection structure as shown, at the contact portion between the retaining portion 29 of the movable member 13 and the insulating operating rod 14, thin films 31a, 31b of solid lubricating material are provided. Fluorine resins such as polytetrafluoroethylene (PTFE) and the like can be used as the solid lubricant.

[0102] The entire holding portion 29 may be made of a solid lubricating material, but since it is difficult to ensure mechanical strength, it is most practical to provide the thin films 31a, 31b only at the contact portions as shown in the figure. Since the frictional force can be greatly reduced by the thin films 31a, 31b of the solid lubricant, the occurrence of foreign matter such as ...

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Abstract

Disclosed is a compact gas-insulated switching device with a reduced number of components. A large-diameter part (16) is formed in the central part in the axial direction of a rotary shaft (15) which is driven and rotated by an operating device. An insulated operating rod (14) the other end of which is moved in an arc by the rotation of the rotary shaft (15) is formed by cast molding and encases and is formed integrally with the large-diameter part (16) of the rotary shaft (15) in a filler packed with resin. The contact connection part of the insulated operating rod (14) and a movable element (13) is formed for example on an elliptically shaped contact face (21) to contact at almost one point on the central axial line of the movable element (13) during the switching operation.

Description

technical field [0001] The present invention relates to a gas insulated switchgear for opening and closing a movable member using an insulating operating rod that rotates around a rotating shaft. Background technique [0002] Gas insulated switchgear includes a switch using a movable member that is opened and closed by an operator. For example, if the switch is accompanied by the opening and closing action of the movable contact in the switch, there will be metal foreign objects on the high voltage side. , There is a danger that the withstand voltage performance of the switch will be significantly reduced. [0003] Therefore, in the conventional switch, as a type excellent in suppressing the generation of foreign matter, for example, as described in JP 2002-245909 (Patent Document 1), it has been proposed to use a metal switch on the contact side. A rod or a gear converts its rotary motion into a linear motion, and then, via an insulating operating rod, drives the structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02B13/02H01H33/64
CPCH01H33/42H01H2033/888H01H33/91
Inventor 篠原亮一六户敏昭加藤達朗青柳健二伊藤武志
Owner HITACHI LTD
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