Insulator and method for improving surface electric strength of insulator

Abstract

The invention discloses an insulator, which comprises two insulator non-groove regions and an insulator groove region, wherein the insulator groove region is located between the two insulator non-groove regions; a plurality of grooves are formed in the insulator groove region; an intercalation electrode is arranged in each groove; cathodes and anodes are arranged in the two insulator non-groove regions respectively; and the grooves, the cathodes and the anodes are located at the same side of the insulator. According to the insulator, adjustment of secondary electron emission and multiplication processes of the surface of the insulator is achieved by simultaneously utilizing the grooves in the surface of the insulator and a periodically changing normal electric field generated by intercalation of the metal electrodes, so that the target of improving the vacuum surface electrical resistance characteristic of the insulator is achieved. The method disclosed by the invention is easy to process, low in manufacturing technology difficulty, and beneficial to conversion toward an actual engineering application layer; and development of a pulse power technology is promoted.

Description

technical field

[0001] The invention belongs to the technical field of insulators, in particular to an insulator and a method for improving the electric strength along the surface of the insulator. Background technique

[0002] The insulator will break down along the surface when it is much lower than the breakdown strength of itself and the vacuum gap of the same size. -Alumina ceramic systems usually flashover under an electric field of tens of kV / cm, which seriously restricts the insulation performance of high-voltage vacuum electrical systems. Compared with conventional electric vacuum equipment, the insulation problem of pulse power device is particularly prominent due to the limitation of volume and the requirement of compactness. Improving the electric strength along the surface of insulators has become an unavoidable problem in the development of large-scale pulse power devices, and it is a bottleneck technology that limits the development of pulse power technology....

Examples

Embodiment 1

[0036] The grooved area of ​​the insulator is close to the cathode, that is, when the distance between the grooved area and the cathode is l=0, the time delay characteristics of the flashover of the surface grooved insulator embedded in the metal are as follows image 3 shown. It can be seen from the figure that compared with the case without grooves, the flashover time delay after grooves on the surface of the insulator is greatly improved; when the metal is embedded in the grooves, the flashover time delay is further increased. Table 1 shows the electric field strength corresponding to different flashover time delays under three conditions: no groove on the surface of the insulator, groove near the cathode area, and metal embedded in the groove. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 43.4kV / cm, and the flashover field strength of the metal embedded in the groove is 52.2kV / cm. The flashover field strength increased...

Embodiment 2

[0040] The groove position of the insulator is located in the middle area of ​​the electrode, that is, when the distance between the groove area and the cathode is l=5mm, Table 2 shows the three situations of no groove on the surface of the insulator, grooves near the cathode area, and metal embedded in the groove. The electric field strength corresponding to the flashover time delay. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 26.7kV / cm, and the flashover field strength of the metal embedded in the groove is 41.0kV / cm. The flashover field strength is increased by 53.5%; when the flashover time delay is 100ns, the flashover field strength of the groove on the surface is 22.3kV / cm, and the flashover field strength of the metal embedded in the groove is 29.8kV / cm, while the groove The flashover field strength of the embedded metal is increased by 33.6% compared with that of the groove.

[0041] Table 2 The groove is locate...

Embodiment 3

[0044] The position of the insulator groove is close to the anode, that is, when the distance between the groove area and the cathode is l = 10mm, Table 3 shows the different flashover conditions under the three conditions of no groove on the surface of the insulator, grooves near the cathode area, and metal embedded in the groove. The electric field strength corresponding to the time delay. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 41.9kV / cm, and the flashover field strength of the metal embedded in the groove is 57.4kV / cm. The flashover field strength is increased by 37.0%; when the flashover time delay is 100ns, the flashover field strength of the groove on the surface is 30.1kV / cm, while the flashover field strength of the metal embedded in the groove is 39.0kV / cm, while the groove The flashover field strength of embedded metal is 29.6% higher than that of grooved grooves.

[0045] Table 3 The groove is located in ...

technical field

[0001] The invention belongs to the technical field of insulators, in particular to an insulator and a method for improving the electric strength along the surface of the insulator. Background technique

[0002] The insulator will break down along the surface when it is much lower than the breakdown strength of itself and the vacuum gap of the same size. -Alumina ceramic systems usually flashover under an electric field of tens of kV / cm, which seriously restricts the insulation performance of high-voltage vacuum electrical systems. Compared with conventional electric vacuum equipment, the insulation problem of pulse power device is particularly prominent due to the limitation of volume and the requirement of compactness. Improving the electric strength along the surface of insulators has become an unavoidable problem in the development of large-scale pulse power devices, and it is a bottleneck technology that limits the development of pulse power technology....

Examples

Embodiment 1

[0036] The grooved area of ​​the insulator is close to the cathode, that is, when the distance between the grooved area and the cathode is l=0, the time delay characteristics of the flashover of the surface grooved insulator embedded in the metal are as follows image 3 shown. It can be seen from the figure that compared with the case without grooves, the flashover time delay after grooves on the surface of the insulator is greatly improved; when the metal is embedded in the grooves, the flashover time delay is further increased. Table 1 shows the electric field strength corresponding to different flashover time delays under three conditions: no groove on the surface of the insulator, groove near the cathode area, and metal embedded in the groove. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 43.4kV / cm, and the flashover field strength of the metal embedded in the groove is 52.2kV / cm. The flashover field strength increased...

Embodiment 2

[0040] The groove position of the insulator is located in the middle area of ​​the electrode, that is, when the distance between the groove area and the cathode is l=5mm, Table 2 shows the three situations of no groove on the surface of the insulator, grooves near the cathode area, and metal embedded in the groove. The electric field strength corresponding to the flashover time delay. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 26.7kV / cm, and the flashover field strength of the metal embedded in the groove is 41.0kV / cm. The flashover field strength is increased by 53.5%; when the flashover time delay is 100ns, the flashover field strength of the groove on the surface is 22.3kV / cm, and the flashover field strength of the metal embedded in the groove is 29.8kV / cm, while the groove The flashover field strength of the embedded metal is increased by 33.6% compared with that of the groove.

[0041] Table 2 The groove is locate...

Embodiment 3

[0044] The position of the insulator groove is close to the anode, that is, when the distance between the groove area and the cathode is l = 10mm, Table 3 shows the different flashover conditions under the three conditions of no groove on the surface of the insulator, grooves near the cathode area, and metal embedded in the groove. The electric field strength corresponding to the time delay. When the flashover time delay is 50ns, the flashover field strength of the groove on the surface is 41.9kV / cm, and the flashover field strength of the metal embedded in the groove is 57.4kV / cm. The flashover field strength is increased by 37.0%; when the flashover time delay is 100ns, the flashover field strength of the groove on the surface is 30.1kV / cm, while the flashover field strength of the metal embedded in the groove is 39.0kV / cm, while the groove The flashover field strength of embedded metal is 29.6% higher than that of grooved grooves.

[0045] Table 3 The groove is located in ...

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