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Gas insulated switchgear and gas insulated busbar

A gas-insulated switching and gas-insulated technology, applied in switchgear, switchgear setting, fully enclosed busbar device, etc., can solve problems such as easy generation of high electric field

Inactive Publication Date: 2014-10-15
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that a high electric field is likely to be generated at the periphery of the supporting body 3 or the end of the bus bar as an insulator in the bus bar 22 or the connection device that accommodates the high-voltage conductor.

Method used

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  • Gas insulated switchgear and gas insulated busbar
  • Gas insulated switchgear and gas insulated busbar
  • Gas insulated switchgear and gas insulated busbar

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0030] (structure)

[0031] First, the gas insulated switchgear and gas insulated bus bar according to the first embodiment will be described. figure 1 The bus bar 22 of the gas insulated switchgear according to the first embodiment or the connecting device that accommodates the high-voltage conductor 1 is shown. Such as figure 1 As shown, the high-voltage conductor 1 is supported by the supporting body 3 and thus inserted into the airtight container 2. An electric field relaxation shield 5 is interposed between the high-voltage conductor 1 and the support 3.

[0032] The airtight container 2 is a metal container. An insulating gas 4 is enclosed in the airtight container 2. As the insulating gas 4, SF can be cited 6 gas. In recent years, SF 6 Since the gas is a gas with a high global greenhouse effect, it is designated as a target for emission restrictions. Therefore, from the viewpoint of reducing the load on the environment, as the enclosed insulating gas 4, natural source ...

no. 2 approach

[0047] (structure)

[0048] Next, the gas insulated switchgear and the gas insulated bus bar according to the second embodiment will be described. figure 2 The bus bar 22 of the gas insulated switchgear according to the second embodiment or the connecting device that accommodates the high-voltage conductor 1 is shown. Such as figure 2 As shown, in the gas insulated switchgear according to the second embodiment, the end shield 6 is provided at the end of the circuit formed by the high-voltage conductor 1.

[0049] The end shield 6 has a hollow spherical pot shape with an open area, and is an insulator formed by molding a thermoplastic plastic. The end shield 6 is also shaped or ground so that the surface roughness of the inner and outer surfaces of the sphere is 5 μm or less.

[0050] The end shield 6 is in the airtight container 2 with the opening toward the circuit end of the high-voltage conductor 1 and is interposed between the circuit end and the airtight container 2. Specifi...

no. 3 approach

[0061] (structure)

[0062] Next, based on image 3 The gas insulated switchgear and gas insulated bus bar according to the third embodiment will be described. Regarding the same configuration as the first or second embodiment, the same reference numerals are assigned, and detailed descriptions are omitted.

[0063] In this third embodiment, the electric field mitigation shield 5 is fastened to the support body 3 with the plastic bolt 12, and the end shield 6 is connected to the plastic stud 13. Since the electric field relaxation shield 5 and the end shield 6 are insulators, the plastic bolt 12 and the plastic stud 13 are not electrically connected to the high-voltage conductor 1 and the contact 7, and are not biased externally. Not grounded. Therefore, the facing surfaces of the electrolysis relaxation shield 5 and the end shield 6 that face the high-voltage conductor 1, that is, the conductive layer 10 has a drift potential. The drift potential, when added to the electric fi...

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Abstract

Provided is a gas insulated switchgear, the insulation performance and insulation reliability of which are enhanced and also provided is a gas insulated busbar for the gas insulated switchgear. The gas insulated switchgear has a high-voltage conductor (1) supported by a support body (3) in a hermetic container (2) into which an insulation gas (4) is sealed. An electric field relaxation shield (5) made of an insulator is interposed between the support body (3) and the high-voltage conductor (1). A conductive layer (10) electrically connected to the high-voltage conductor (1) is formed on the surface of the electric field relaxation shield (5) facing the high-voltage conductor (1). Alternatively, an end shield (6) made of an insulator is interposed between an electrical path end of the high-voltage conductor (1) and the hermetic container (2). The conductive layer (10) electrically connected to the high-voltage conductor (1) is formed on the surface of the end shield (6) facing the electrical path end.

Description

Technical field [0001] The embodiment of the present invention relates to a gas insulated switchgear used in a power station, a substation, etc., and a gas insulated bus bar provided with the gas insulated switchgear. Background technique [0002] Currently, switching devices are widely used in high-voltage and large-capacity power systems such as high power stations and substations. Such as Figure 4 As shown, the switching device has a disconnector 21, a bus bar 22, a circuit breaker 23, a switch 24, a transformer 25, and a cable head 26, and is controlled by a control panel 27. The disconnector 21 has a bus bar 22 connected to one of its sockets, and a cable head 26 on the cable line side is connected to the other socket via a circuit breaker 23, a grounding switch 24, a transformer 25, and the like. These devices are electrically connected to each other through high-voltage conductors. [0003] In recent years, the opening and closing device is required to be applied to the un...

Claims

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Application Information

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IPC IPC(8): H02G5/06H02B13/02
CPCH02G5/063H02G5/068H02B13/035
Inventor 安冈孝伦保科好一岛村旭椎木元晴
Owner KK TOSHIBA