CN102735895B

CN102735895B - Capacitive voltage divider

Info

Publication number: CN102735895B
Application number: CN2012101824226A
Authority: CN
Inventors: 董森森; 王红庆
Original assignee: Pinggao Group Co Ltd
Current assignee: Henan High General Electric Co Ltd; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Priority date: 2012-06-05
Filing date: 2012-06-05
Publication date: 2013-12-11
Anticipated expiration: 2032-06-05
Also published as: CN102735895A

Abstract

The invention relates to a capacitive voltage divider. A necking structure is provided under the large diameter section of the shielding tube of the invention, and the necking structure has a stop facing the upper end of the shielding tube for supporting the lower end of the cylindrical electrode. The stop surface becomes an important part of the support structure, and the contact between the cylindrical electrode and the shielding cylinder is isolated by the insulating support arranged on the stop surface, so that the simple structural change adopted by the present invention can achieve the support of the cylindrical electrode. The purpose of this method is to further solve the problem of the complex structure of the capacitive voltage divider in the prior art.

Description

A kind of capacitive divider

Technical field

The present invention relates to the high-voltage electrical apparatus technical field, relate in particular to a kind of capacitive divider.

Background technology

Difference according to sectional pressure element, active type electronic type voltage transformer (being called for short EVT) is based on electric resistance partial pressure, a kind of mutual inductor of capacitance partial pressure and capacitance-resistance voltage division principle, and voltage divider is as the sensing unit of active type electronic type voltage transformer, to the active type electronic type voltage transformer use and production has material impact, wherein the coaxial type capacitive divider has obtained extensive application with the advantage of its simple structure and stable serviceability in the mutual inductor field, disclosed coaxial type capacitive divider in the document of " atomic energy science and technology " fifth phase in 1979 disclosed one piece 250 kilovolts by name two coaxial capacitive voltage dividers for example, this coaxial type capacitive divider is by columned center conductor, tubular electrode and shielding cylinder are around the central axis of upper downward-extension sheathed forming successively from inside to outside, but due to tubular electrode wherein by the high-field electrode fixed mount, ball cap, the frameworks such as hemispherical nut are fixed between radome and center conductor, make the complicated structure of location tubular electrode in the coaxial type capacitive divider, thereby improved the production cost of coaxial type capacitive divider, extended the production cycle of coaxial type capacitive divider, the suitability for industrialized production that is unfavorable for mutual inductor.

Summary of the invention

The present invention proposes a kind of capacitive divider, be intended to solve the baroque problem of capacitive divider in prior art.

The technical scheme of capacitive divider of the present invention is as follows:

A kind of capacitive divider, comprise around the central axis of upper downward-extension sheathed center conductor, tubular electrode and the shielding cylinder of coaxial spaced successively from inside to outside, between described shielding cylinder and tubular electrode, be provided with for limiting the supporting construction of spacing between the two, the top of described shielding cylinder has the large footpath section around outer peripheral face; Described supporting construction comprises the thin necking down structure of large footpath section of the ratio shielding cylinder that the below of the large footpath section of shielding cylinder arranges, described necking down structure has the stopping surface towards the annular spread for the lower end that holds up tubular electrode of the upper end of shielding cylinder, and described stopping surface is provided with lower surface for being installed in tubular electrode and the insulation support body between stopping surface.

Described necking down structure comprises the thin thin neck section than shielding cylinder upper end of below, placement, the lower end in tubular electrode that described shielding cylinder has, the perisporium of the perisporium of described thin neck section and the upper end of shielding cylinder is by the ring-shaped step wall transition arranged between the two, the top ring end face that described stopping surface is described ring-shaped step wall.

Described insulation support body is for setting up the annular insulating mat circle on described stopping surface.

The transition position of described insulation support body in the upper end of described stopping surface and described shielding cylinder inwall.

Spacing between the internal face of described shielding cylinder and the outside wall surface of tubular electrode is less than the spacing between the outside wall surface of the internal face of tubular electrode and center conductor.

The below of the large footpath section of shielding cylinder of the present invention is provided with the necking down structure, and the stopping surface for the lower end that holds up tubular electrode of the upper end towards shielding cylinder that the necking down structure has becomes the important component part of supporting construction, by contacting between the isolated tubular electrode of the insulation support body that arranges on stopping surface and shielding cylinder, thereby the simple structural change that makes the present invention adopt just can reach the purpose that supports tubular electrode, and then has solved the baroque problem of capacitive divider in the prior art.

The accompanying drawing explanation

Fig. 1 is the structural representation of embodiments of the invention.

Embodiment

The embodiment of capacitive divider of the present invention: as shown in Figure 1, this capacitive divider 1 comprises around the central axis of the upper downward-extension sheathed center conductor 2 of coaxial spaced successively from inside to outside, tubular electrode 3 and shielding cylinder 4, wherein, spacing between the outside wall surface of the internal face of shielding cylinder 4 and tubular electrode 3 is less than the spacing between the outside wall surface of the internal face of tubular electrode 3 and center conductor 2, the lower end of tubular electrode 3 is in the section of large footpath, the top of shielding cylinder 4, between shielding cylinder 4 and tubular electrode 3, be provided with for the fixing supporting construction 5 of tubular electrode 3 positions, this supporting construction 5 comprises the thin necking down structure 5-1 of large footpath section of the ratio shielding cylinder 4 that the section below, large footpath of shielding cylinder 4 arranges, this necking down structure 5-1 comprises the thin thin neck section 5-2 in ratio shielding cylinder 4 upper ends of the below, placement, the lower end in tubular electrode 3 that described shielding cylinder 4 has, the perisporium of the upper end of the perisporium of thin neck section 5-2 and shielding cylinder 4 is by the ring-shaped step wall 5-3 transition arranged between the two, the top ring end face of ring-shaped step wall 5-3 is the stopping surface 5-4 for the lower end that holds up tubular electrode 3 towards the upper end of shielding cylinder 4, and be provided with lower surface for being installed in tubular electrode 3 and the insulation support body 5-5 between stopping surface 5-4 on this stopping surface 5-4, insulation support body 5-5 is for setting up the annular insulating mat circle on stopping surface 5-4, and the transition position of insulation support body 5-5 in the upper end inwall of stopping surface 5-4 and shielding cylinder 4.

In use, the spacing between the outside wall surface of the internal face of shielding cylinder 4 and tubular electrode 3 is less than the spacing between the outside wall surface of the internal face of tubular electrode 3 and center conductor 2, so that the voltage signal of low-voltage output signal is lower in the present invention; The outside wall surface of the internal face of tubular electrode 3 and center conductor 2 forms the outside wall surface of high-voltage capacitance, tubular electrode 3 as two pole plates and the internal face of shielding cylinder 4 forms low-voltage capacitance as two pole plates; The upper end of shielding cylinder 4 has following three effects: the one, for shielding center conductor 2; The 2nd, for carrying insulation support body 5-5 and tubular electrode 3; The 3rd, form secondary capacitor with tubular electrode 3; The thin neck section 5-2 of shielding cylinder 4 and followingly do not limit, can be processed as flange, external thread or other shapes according to the mounting means difference; Insulation support body 5-5, in order to carrying fixing tubular electrode 3, prevents that tubular electrode 3 is connected and is short-circuited with shielding cylinder 4; After dividing potential drop, there is low voltage signal on tubular electrode 3, can adopt any-mode that its signal is taken out, send collector to and processed.

In the above-described embodiments, the necking down structure consists of thin neck section and the ring-shaped step wall of shielding cylinder, in other embodiments, the boss that this necking down structure is convexly equipped with on also can the inwall by shielding cylinder or bulge-structure or back-up ring form, these structures are the known technology of art technology person, therefore repeat no more.

In the above-described embodiments, insulation support body is the annular insulating mat circle, and in other embodiments, this annular insulating mat circle also can be replaced with members such as cross-over blocks, between these structures and annular insulating mat circle, belongs to similar replacement, therefore repeats no more.

In the above-described embodiments, spacing between the internal face of shielding cylinder and the outside wall surface of tubular electrode is less than the spacing between the outside wall surface of the internal face of tubular electrode and center conductor, in other embodiments, spacing between the internal face of shielding cylinder and the outside wall surface of tubular electrode also can be more than or equal to the spacing between the outside wall surface of the internal face of tubular electrode and center conductor, to strengthen the intensity of low voltage signal.

Claims

1. A capacitive voltage divider, comprising a center conductor, a cylindrical electrode and a shielding tube that are coaxially spaced from the inside to the outside around the central axis that extends up and down, and the shielding tube and the cylindrical electrode are provided with a The supporting structure is used to limit the distance between the two, and it is characterized in that: the upper part of the shielding cylinder has a large diameter section around the outer peripheral surface; The necking structure is thinner than the large diameter section of the shielding cylinder, and the necking structure has an annular stop surface for supporting the lower end of the cylindrical electrode towards the upper end of the shielding cylinder, and the said stop surface An insulating support body is provided for installation between the lower end surface of the cylindrical electrode and the blocking surface, and the insulating support body is an annular insulating washer used to be built on the blocking surface. the

2. The capacitive voltage divider according to claim 1, characterized in that: the necking structure comprises a thin neck of the shielding tube which is located below the lower end of the cylindrical electrode and is thinner than the upper end of the shielding tube section, the peripheral wall of the thin neck section and the peripheral wall of the upper end of the shielding cylinder are transitioned through an annular stepped wall arranged between the two, and the stop surface is the upper ring end surface of the annular stepped wall. the

3 . The capacitive voltage divider according to claim 1 , wherein the insulating support is located at the transition between the blocking surface and the upper inner wall of the shielding cylinder. 4 . the

4. The capacitive voltage divider according to claim 1, characterized in that: the distance between the inner wall surface of the shielding tube and the outer wall surface of the cylindrical electrode is smaller than the inner wall surface of the cylindrical electrode and the outer wall surface of the central conductor spacing between. the