CN219393163U

CN219393163U - External current transformer special sealing structure for GIS

Info

Publication number: CN219393163U
Application number: CN202320749707.7U
Authority: CN
Inventors: 刘振; 程浩; 侯磊; 杨海东; 吕阳; 刘凯; 张建华
Original assignee: Shandong Taikai High Volt Switchgear Co Ltd
Current assignee: Shandong Taikai High Volt Switchgear Co Ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-07-21
Anticipated expiration: 2033-04-07

Abstract

The utility model relates to the technical field of high-voltage switches, in particular to a special sealing structure of an external current transformer for a GIS, which comprises a first flange, a compression ring and a second flange, wherein the first flange and the compression ring are connected through bolts, the second flange is fixedly connected to the end part of an aluminum plate, clamping grooves are formed in the opposite surfaces of the compression ring and the first flange, the second flange is embedded in the clamping grooves, insulating gaskets are respectively arranged between the second flange and the first flange, between the second flange and the compression ring and between the compression ring and the aluminum plate, and the first flange, the second flange and the insulating gaskets are in butt joint through compression of the compression ring. The use of this application can satisfy confined while under insulating gasket and insulating seal circle use's the prerequisite, has certain space, ensures that the magnetic field that flows through alternating current and produce in the GIS conductor can pass this space and get into the iron core of secondary coil and then secondary coil production electric current, simultaneously, because the second flange inlays in the draw-in groove, consequently, the draw-in groove has certain turning, consequently, can further increase its leakproofness, prevents gas leakage.

Description

External current transformer special sealing structure for GIS

Technical Field

The utility model belongs to the technical field of high-voltage switches, and particularly relates to a special sealing structure of an external current transformer for a GIS.

Background

The current transformer is one of important components of GIS equipment, and has the main functions of measuring current and metering, measuring and protecting a power grid. The current transformer for the GIS adopts a through type structure, and is divided into an internal type structure and an external type structure, wherein the primary coil is a GIS conductor, the secondary coil with the internal type structure is positioned in the GIS enclosed air chamber, and the secondary coil with the external type structure is positioned outside the GIS enclosed air chamber. The secondary coil of the built-in current transformer is positioned in the GIS air chamber filled with SF6, and because the secondary coil has more insulating materials and is easy to absorb moisture, the insulation performance is greatly affected due to excessive moisture of the GIS air chamber, and therefore, the built-in current transformer coil is often required to be dried to expel the moisture. The external current transformer is gradually popularized because the secondary coil of the external current transformer is positioned outside the GIS air chamber and does not influence the treatment of the moisture of the GIS air chamber.

The external current transformer has the advantages that the primary coil is a GIS conductor and is positioned in the GIS air chamber, the secondary coil is positioned outside the GIS air chamber, and the middle of the secondary coil is a closed aluminum shell, so that a special sealing structure is needed, SF6 gas in the air chamber is not leaked, and a magnetic field generated by alternating current flowing in the GIS conductor is needed to pass through the aluminum shell and enter an iron core of the secondary coil, so that the secondary coil generates current.

When the conventional external current transformer is used, the first flange and the second flange are directly abutted and sealed by bolts, and when the first flange and the second flange are abutted, the sealing effect is often poor because the insulating gasket is arranged between the first flange and the second flange and is of a planar structure, and the air leakage phenomenon at the gap between the first flange and the second flange can occur, so that the normal use of the external current transformer is affected.

Disclosure of Invention

The utility model provides a special sealing structure of an external current transformer for a GIS, which is used for solving the defects in the prior art.

The utility model is realized by the following technical scheme:

the utility model provides an external current transformer special seal structure for GIS, includes bolted connection's first flange and clamping ring, fixed connection at the second flange of aluminum plate tip, and the draw-in groove has been seted up to the opposite face of clamping ring and first flange, and the second flange inlays in the draw-in groove, has all to pad insulating gasket between second flange and the first flange, between second flange and the clamping ring and between clamping ring and the aluminum plate, and first flange, second flange and insulating gasket are in the same place through the extrusion butt joint of clamping ring.

This application is when using, because the draw-in groove is opened to first flange and second flange opposite face and is inlayed in the draw-in groove, consequently, the clearance between second flange and the first flange has the turning along the recess that first flange or second flange were seted up, between second flange and the first flange, between second flange and the clamping ring and all fill up insulating spacer between clamping ring and the aluminum plate, consequently, be difficult for gas leakage simultaneously under the prerequisite that satisfies with insulating clearance, and under the extrusion of clamping ring, when can be better compress tightly the second flange, the second flange that the through-hole led to the fact is seted up on the second flange is fragile, and then further prevent gas leakage between second flange and the first flange.

Preferably, a placing groove is formed in the second flange towards one side face of the first flange, an insulating sealing ring is arranged in the placing groove, and the outer side face of the insulating sealing ring is in contact with the placing groove and the first flange. The insulating sealing ring not only can seal the gap between the second flange and the first flange at the placing groove to prevent the second flange from air leakage, but also ensures that a gap formed by materials with strong insulating property exists between the inside and the outside of the GIS air chamber, and ensures that a magnetic field generated by alternating current flowing in the GIS conductor can pass through the gap to enter the iron core of the secondary coil so as to generate current for the secondary coil.

Preferably, the insulating gasket between the second flange and the first flange extends to the placing groove. The insulating gasket extends to the placing groove to realize the butt joint of the insulating sealing ring and the insulating gasket, so that a better sealing effect is realized.

Preferably, the section of the insulating sealing ring is of a circular structure, the diameter of the section is identical to the width of the placing groove, so that the insulating sealing ring can be ensured to seal the placing groove, gas is prevented from flowing out of the placing groove, and enough insulating gaps can be reserved between the insulating sealing ring and the placing groove.

Preferably, the second flange and the aluminum plate are fixedly connected together through welding, and the section of the welding flux is in an inverted funnel shape.

The beneficial effects of the utility model are as follows: the use of this application can satisfy confined while under insulating gasket and insulating seal circle use's the prerequisite, has certain space, ensures that the magnetic field that flows through alternating current and produce in the GIS conductor can pass this space and get into the iron core of secondary coil and then secondary coil production electric current, simultaneously, because the second flange inlays in the draw-in groove, consequently, the draw-in groove has certain turning, consequently, can further increase its leakproofness, prevents gas leakage.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a partial enlarged view of I of fig. 1.

The figure shows:

1. the sealing device comprises a first flange, a second flange, a pressing ring, an insulating sealing ring, an insulating gasket and an insulating gasket, wherein the first flange, the second flange, the pressing ring, the insulating sealing ring and the insulating gasket are arranged in sequence.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

A special sealing structure of an external current transformer for GIS is shown in fig. 1 and 2. Including first flange 1 and clamping ring 3, fixed connection at the second flange 2 of aluminum plate tip, the communicating screw has transversely been seted up on first flange 1 and the clamping ring 3, the bolt passes the screw and with screw thread fit, the draw-in groove has been seted up to clamping ring 3 and the relative face lower part of first flange 1, the bolt is located the draw-in groove top, second flange 2 inlays in the draw-in groove, between second flange 2 and the first flange 1, between second flange 2 and the clamping ring 3 and all pad insulating gasket 5 between clamping ring 3 and the aluminum plate, first flange 1, second flange 2 and insulating gasket 5 are in the same place through clamping ring 3 extrusion butt joint.

This application is when using, because the draw-in groove is opened to first flange 1 and second flange 2 opposite face and the second flange 2 inlays in the draw-in groove, consequently, the clearance between second flange 2 and the first flange 1 has the turning along the recess that first flange 1 or second flange 2 were seted up, between second flange 2 and first flange 1, between second flange 2 and clamping ring 3 and between clamping ring 3 and the aluminum plate all fill up insulating spacer 5, consequently, be difficult for gas leakage simultaneously under satisfying the prerequisite with insulating gap, and under the extrusion of clamping ring 3, when can be better compress tightly second flange 2, prevent to set up the second flange 2 that the through-hole caused on second flange 2 fragile, and then further prevent gas leakage between second flange 2 and the first flange 1.

Wherein, the standing groove has been seted up towards one side of first flange 1 to second flange 2, is equipped with insulating sealing washer 4 in the standing groove, and insulating sealing washer 4's terminal surface and standing groove inner wall and first flange 1 contact. The insulating sealing ring 4 not only can seal the gap between the second flange 2 and the first flange 1 at the placing groove to prevent the leakage of the air, but also ensures that a gap formed by materials with strong insulating property exists between the inside and the outside of the GIS air chamber, and ensures that a magnetic field generated by alternating current flowing in a GIS conductor can pass through the gap to enter the iron core of the secondary coil so as to generate current for the secondary coil.

The insulating spacer 5 between the second flange 2 and the first flange 1 extends to the placement groove. The insulating gasket 5 extends to the placing groove to realize the butt joint of the insulating sealing ring 4 and the insulating gasket 5, so as to realize better sealing effect.

The insulating sealing ring 4 tangent plane is circular structure and diameter and standing groove width unanimity to can guarantee insulating sealing ring 4 can seal the standing groove when satisfying, prevent that gas from flowing out through the standing groove, can also make to reserve sufficient insulating space between insulating sealing ring 4 and the standing groove.

The second flange 2 and the aluminum plate are fixedly connected together through welding, and the section of the welding flux is in an inverted funnel shape.

The use of this application can satisfy confined while under insulating gasket 5 and insulating seal 4 use's the prerequisite, has certain space, ensures that the magnetic field that flows alternating current and produce in the GIS conductor can pass this space and get into the iron core of secondary coil and then secondary coil production electric current, simultaneously, because second flange 2 inlays in the draw-in groove, consequently, the draw-in groove has certain turning, consequently, can further increase its leakproofness, prevents gas leakage.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a special seal structure of external current transformer for GIS which characterized in that: including bolted connection's first flange and clamping ring, fixed connection at the second flange of aluminum plate tip, the draw-in groove has been seted up to the opposite face of clamping ring and first flange, and the second flange inlays in the draw-in groove, all fills up between second flange and the first flange, between second flange and the clamping ring and between clamping ring and the aluminum plate and has insulating gasket, and first flange, second flange and insulating gasket are in the same place through the extrusion butt joint of clamping ring.

2. The special sealing structure of the external current transformer for the GIS according to claim 1, wherein: a placing groove is formed in the second flange towards one side face of the first flange, an insulating sealing ring is arranged in the placing groove, and the outer side face of the insulating sealing ring is in contact with the placing groove and the first flange.

3. The special sealing structure of the external current transformer for the GIS according to claim 2, wherein: the insulating gasket between the second flange and the first flange extends to the place where the groove is located.

4. The special sealing structure of the external current transformer for the GIS according to claim 2, wherein: the insulating sealing ring tangent plane is circular structure and diameter and placing groove width unanimity.

5. The special sealing structure of the external current transformer for the GIS according to claim 1, wherein: the second flange and the aluminum plate are fixedly connected together through welding, and the section of the welding flux is in an inverted funnel shape.