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Aluminium-oxide whisker insulator for suppressing VFTO

A technology of alumina whiskers and insulators, which is applied in the field of power equipment, can solve problems such as unstable operation of GIS equipment and charge accumulation on the surface of insulators, and achieve the effect of reducing charge accumulation and maintaining reliability

Active Publication Date: 2017-11-17
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides an alumina whisker insulator for suppressing VFTO, so as to solve the problem of unstable operation of GIS equipment caused by the accumulation of charges on the surface of the insulator under the action of VFTO

Method used

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  • Aluminium-oxide whisker insulator for suppressing VFTO
  • Aluminium-oxide whisker insulator for suppressing VFTO
  • Aluminium-oxide whisker insulator for suppressing VFTO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 A schematic structural diagram of an aluminum oxide whisker insulator for suppressing VFTO provided in an embodiment of the present application. see figure 1 , the insulator includes: a central insert 1, an alumina whisker insulating area 2, a creepage area 3 and a fixed flange 4. Wherein, the central insert 1 is arranged at the top of a hollow cone, and the cone is divided into two parts, one end of which is close to the central insert 1 is the alumina whisker insulating area 2, and the rest is the creepage area 3 , the bottom of the creepage zone 3 is connected with the fixed flange 4 . That is to say, the longitudinal section of the insulator is a "V"-shaped structure.

[0028] Optionally, the alumina whisker insulating region 2 provided in the embodiment of the present application is an epoxy resin-based alumina whisker edge region, wherein the addition amount of the alumina whiskers can be any value between 5-10%, for example 8%. It should be noted th...

Embodiment 2

[0037] The various components of the insulator provided in Example 1 of the present application, including the central insert 1, the alumina whisker insulating area 2, the creepage area 3 and the fixing flange 4, are an integrated connection structure, not by means of bolts, screws, etc. connected. This embodiment mainly describes the preparation method of the insulator.

[0038] The integrated insulator provided in the embodiment of the present application is prepared by a vacuum casting method. During the operation of GIS, under the action of VFTO, charges will be introduced on the surface of the insulator. Compared with the bolt connection, the integrated connection structure is beneficial to reduce the resistance of the insulator itself and facilitate the dissipation of the charges accumulated on the surface of the insulator.

[0039] Specifically, the method for preparing the integrated insulator provided in the embodiment of the present application is as follows:

[0...

Embodiment 3

[0044] In this example, the VFTO wave application experiment was carried out using insulators with 0%, 5%, and 10% of alumina whiskers in the creepage zone 3, respectively, to test the dissipation effect of the insulator on the surface charge, as shown below. .

[0045] image 3 The waveform diagram of the VFTO applied at the center insert 1 provided in the embodiment of the present application. The VFTO wave is applied at the central insert 1 of each insulator above, and the surface potential data of the high-voltage electrode to the surface fixing flange 4 of each insulator are collected, and the following Figure 4 The potential diagram of the high voltage electrode to the insulator's fixing flange 4 is shown.

[0046] from Figure 4 It can be seen that the surface potential of the insulator with the addition of 0% of alumina whiskers in creepage zone 3 is the highest, followed by the insulator with the addition of 5%, and the surface potential of the insulator with the ...

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Abstract

The application relates to the technical field of power equipment, particularly to an aluminium-oxide whisker insulator for suppressing a VFTO. The insulator comprises a center embedded member, an aluminium-oxide whisker insulating area, a creepage area and a fixed flange. The center embedded member is arranged at the top of a hollow cone; the aluminium-oxide whisker insulating area is formed at one end, approaching the center embedded member, of the cone; and the creepage area is formed at the rest part; and the bottom of the creepage area is connected with the fixed flange. A large contact interface is formed between the aluminium-oxide whisker in the aluminium-oxide whisker insulating area and the substrate; when an external VFTO is applied to the surface of the insulator, the pull-back frequency of the VFTO is increased by the contact interface, the propagation of the VFTO in a basin type insulator is restricted, and thus normal electric field distribution formed on the surface of the basin type insulator is suppressed. Therefore, when a VFTO wave occurs, charge accumulation on the side wall of the insulator is reduced and reliability of the insulator is kept.

Description

technical field [0001] The present application relates to the technical field of power equipment, and in particular, to an alumina whisker insulator for suppressing VFTO. Background technique [0002] GIS (Gas Insulated Switchgear, gas-insulated metal-enclosed combined electrical appliances) has many characteristics such as small footprint and space, safe and reliable operation, little influence by the natural environment, good breaking performance of circuit breakers, and convenient installation, so it is widely used in in the AC substation. In GIS, insulators are very important insulating components, which play the roles of fixing, insulating and sealing. [0003] At present, insulators commonly used in GIS equipment include center inserts, insulating areas and connecting seats. When VFTO (Veryfast transient overvoltage) acts on the surface of the insulator, the insulator cannot dissipate the charge, which causes the insulator to withstand a large DC voltage, which in tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/42
CPCH01B17/42
Inventor 何顺何金良李传扬程志万彭兆裕
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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