KR100920721B1 - High pressure cable draw out terminal for gas type transformer - Google Patents

Abstract

The present invention is a high voltage side cable take-out device for gas insulated water substation equipment to more stably withdraw the high-voltage side cable from the water substation equipment (switch, switchgear, transformer current transformer, etc.) without the high voltage bushing, cable head, elbow for insulation. The present invention relates to an insulator provided on the high pressure side cable in the enclosure for drawing out or drawing in the high voltage side cable, an insulator provided on the high pressure side cable in the enclosure, a sealing material to be combined with the insulator on the high pressure side cable, and the inside of the enclosure. The insulator and the sealing material cover the molded body, and at the same time pressurized while including a flange cover for tightly fixing the molded body to the inner wall of the enclosure formed through holes.

Gas Insulation, Water Substation Equipment, Enclosure, High Pressure Bushing, Drawer, High Voltage Cable

Description

High pressure cable draw out terminal for gas insulated water substation facility

1 is an exploded perspective view of a high-voltage side cable take-out apparatus for gas insulated water substation facilities according to an embodiment of the present invention.

Figure 2 is an exploded cross-sectional view showing a coupling process of the take-out device according to FIG.

3 is a combined cross-sectional view showing a combined state of the take-out device according to FIG.

4 is a cross-sectional view of the coupling according to another embodiment of the coalescence shown in FIG.

<Description of the symbols for the main parts of the drawings>

1 ... enclosure 2 ...

10 ... through hole 20 ... cable

22 ... Union 22a ... Insulator

22b ... sealing material 24 ... flange cover

200 ... conductor 202 ... insulating layer

The present invention relates to a gas insulated water substation facility using gas as a cooling medium. More specifically, the high pressure cable can be stably drawn out from the water substation without the insulation and connection unit such as a high pressure bushing, a cable head, and an elbow. The present invention relates to a high voltage cable drawing device for a gas insulated power receiving facility, which can reduce the overall volume of the water substation facility, thereby further reducing the space required for installation of various water substation facilities.

The water substation facility has to have high reliability so that it can stably supply a large amount of power, and in the event of a system accident and a fire in the building, the facility itself needs to be inflammable so that there is no fire or spread due to these facilities.

Accordingly, in recent years, the use of gas insulated transformers instead of general inlet transformers with a high risk of fire or explosion is increasing. Gas-insulated transformers use non-combustible SF6 gas as insulation and cooling medium, and are highly reliable for a long time, and essentially eliminate the risk of fire or explosion when using the inlet transformer.

The gas-insulated transformer as described above may vary according to capacity and voltage, but commonly includes a core body including windings and iron cores as essential components to perform the function of the transformer.

As an example, a gas insulated transformer using SF6 (Sulfuric fluorine 6) as insulation and cooling medium may be based, for example, on a double enclosure structure in which an enclosed space is provided in an enclosure (pressure vessel). In this case, the core is installed in the inner box, and the insulating oil is filled in the inner box so that the contact with SF6 (Sulfuric fluor 6; 6 fluorine sulfur) gas inside the main body is completely blocked.

The enclosure is a connection member for applying high voltage power supplied from the outside to the central body, and induces stable cable entry or withdrawal, and has a high pressure bushing, a cable head, and an elbow for insulation purposes.

As such, in the case of a conventional gas insulation water substation facility (automatic switchgear, switchboard, transformer current transformer), insulation and connecting members such as high voltage bushings, cable heads, elbows, etc. Required. The insulation and connection member including the high pressure bushing is disposed outside the enclosure from which the cable is drawn.

Therefore, in the related art, since the insulation and the connection member are exposed to the outside, they are greatly influenced by the environment, and by protruding to the outside, the overall volume of the transformer increases, so that a large installation space must be secured when mounting the installation. There are disadvantages that follow.

The present invention has been made in view of the above-described problems of the prior art, it is possible to more stably withdraw the high-voltage side cable from the water substation equipment without the insulation and connection terminals such as high-voltage bushing, cable head, elbow including insulator To more reliably prevent external leakage of cooling gas filled inside the enclosure and to reduce the overall volume of the transformer as bulky insulation and connection terminals such as high pressure bushings, cable heads and elbows are not required. An object of the present invention is to provide a high voltage cable drawing device for a gas insulated water substation facility.

In order to achieve the above technical problem, the present invention provides a through-hole formed in the enclosure for drawing out or drawing out the high voltage side cable, an insulator provided on the high pressure side cable inside the enclosure, and a sealing material formed on the high pressure side cable and the insulator. And a flange cover which covers the assembly in which the insulator and the sealing material are joined inside the enclosure and pressurizes the flange cover for tightly fixing the assembly to the inner wall of the enclosure where the through-hole is formed. do.

Preferably, the insulator is formed in a conical shape, the width of which is gradually narrowed toward one end, and the sealing material has a groove on its inner surface to which the conical insulator is joined.

More preferably, the insulator outer surface and the sealing member inner surface, respectively, may be formed with an uneven surface having a curved waveform continuous in the longitudinal direction of the insulator and the sealing material. In this case, it is possible to reliably maintain the airtightness between the two components when the insulator and the sealing material are combined.

Here, it is preferable that the length of the molded body in which the insulator and the sealing material are combined is larger than the depth of depression of the flange cover. In this case, when the flange cover is installed on the inner wall of the enclosure, the molded body is elastically deformed while being pressed between the flange cover and the inner wall of the enclosure, and as a result, the gap between the through hole and the high-side cable passing therethrough can be more reliably blocked. Because there is.

The flange cover is formed such that a flange having a plurality of bolting holes is integrally formed on one side of an open end of the flange, and a recess is formed on one surface of the flange to recess the groove for installing the sealing member. It would be nice. This is to improve the seal between the flange cover and the inner wall of the enclosure to completely block the external leakage of the pressure vessel, ie the gas filled inside the enclosure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a high-voltage side cable take-out apparatus for gas insulated water substation facilities according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a coupling process of the present invention according to Figure 1, Figure 3 is Coupling cross-sectional view showing a combined state of the take-out device, Figure 4 is a cross-sectional view according to another embodiment of the coalescence shown in FIG.

As shown in the figure, the present invention provides a withdrawal device 2 on the wall surface of the gas insulation type water substation installation enclosure 1 filled with gas as a cooling medium, and through the takeout device, The main point of the configuration is to allow safer drawing out while maintaining insulation and straightness from inside to outside of the enclosure. The configuration of the withdrawal device according to the present invention will be described in detail.

1 to 3, the drawing device 2 according to the embodiment of the present invention includes a pair of moldable insulators 22a and a sealing material 22b, and the insulator 22a and a sealing material 22b. Includes a flange cover 24 covering the molded body 22. The insulator 22a and the sealing material 22b are mutually disposed on the high-voltage side cable 20 inside the transformer enclosure 1, and the flange cover 24 covers the assembly and a through hole ( 10) is tightly fixed to the inner wall of the formed enclosure (1).

Specifically, the assembly 22 made of the insulator 22a and the sealing material 22b is provided on the high-pressure side cable 20 adjacent to the through hole 10 and the inside of the enclosure. Accordingly, when the cable 20 is pulled out, one surface of the molded body 22 formed of the insulator 22a and the sealing material 22b is in intimate contact with the periphery of the through hole 10. As a result, the high voltage side cable 20 drawn out from the inside of the transformer to the outside through the through hole 10 may be maintained insulated and airtight by the union 22.

Preferably, the high-voltage side cable 20 has a structure in which a conductor 200 having a concave-convex surface of continuous wave form and a polyethylene-based insulating layer 202 are coated on the outer surface of the conductor as shown in a partial enlarged view of FIG. 2. Can be. In this case, the contact area between the conductor 200 and the insulating layer 202 is increased. That is, since a more intimate contact relationship is maintained between the conductor 200 and the insulating layer 202, the gas filled in the enclosure 1 leaks out between the conductor 200 and the insulating layer 202 coated thereon. Can be blocked at source.

More specifically, the insulator 22a is formed in a conical shape whose width gradually narrows toward one end. In addition, the sealing material 22b has a groove on its inner surface to which the conical insulator 22a is joined. Therefore, the insulator 22a and the sealing material 22b are joined together to form one assembly 22 in a form in which the insulator 22a is inserted into the sealing material 22b.

Here, the sealing material 22b serves as a sealing while contacting the through hole through which the cable is drawn out. The insulator 22a is installed on the cable 20 for the purpose of insulation retention and shielding between the cable 20 and another cable adjacent thereto (not shown). Therefore, in consideration of this purpose, it is preferable that the sealing material is made of soft rubber and the insulator is made of hard rubber.

More preferably, the outer surface of the insulator 22a and the inner surface of the sealing material 22b are uneven, each having a curved waveform continuous in the longitudinal direction of the insulator 22a and the sealing material 22b, as in the other embodiment of FIG. 4. Faces may be formed. In this case, since the contact area between the two components is increased when the insulator 22a and the sealing material 22b are combined, the binding force between the insulator 22a and the sealing material 22b may be increased. As a result, the leakage of gas inside the enclosure to the outside through the contact gap between the two components is more reliably prevented.

Meanwhile, the flange cover 24 is welded to the inner wall of the enclosure 1 in which the through hole 10 is formed while covering the assembly 22 in which the insulator 22a and the sealing material 22b are combined within the enclosure 1. Or bolting is fixed. For example, when bolting is fixed, as shown in the figure, a flange 240 having a plurality of bolting balls (not shown) is integrally provided on one side of the open end. In this case, one surface of the flange 240 in contact with the inner wall of the enclosure 1 recesses a sealing member, for example, a recess 242 for installing an O-ring, thereby sealing the member 244 on the recess 242. Is preferably configured to be installed. Thus, since the sealability between the flange cover 24 and the inner wall of the enclosure 1 is further improved, it is possible to more reliably block the external leakage of the gas filled in the pressure vessel, that is, the enclosure 1.

Preferably, the recessed depth D1 of the flange cover 24 is formed at least smaller than the length D2 of the assembly 22 in which the insulator and sealing material are combined (see FIG. 2). In this case, when the flange cover 24 is installed on the inner wall of the enclosure 1, the molded body 22 has an external pressure in its axial direction within the flange cover 24 between the flange cover 24 and the inner wall of the enclosure 1. Receives the elastic expansion in the width direction is in close contact with the through hole 10 and the inner surface of the flange cover 24 more closely. As a result, a gap is not generated between the through hole 10 and the fitting 22 and between the fitting 22 and the flange cover 24 due to the elastic deformation of the fitting 22 due to external pressure.

According to the embodiment of the present invention, the high-pressure bushing as in the prior art through the coupling 22 and the flange cover 24 having an insulating and sealing function is installed in close contact with the through-hole 10 in the enclosure (1), The high pressure side cable 20 can be drawn out from the transformer enclosure 1 from the inside of the transformer enclosure 1 to the outside without blocking the gas leakage even without an insulation member such as a cable head, an elbow or the like. That is, the present invention can reduce the overall volume of the water substation equipment as the above insulation and connecting members are not required, and as a result, it is possible to minimize the space required when installing the transformer.

Moreover, the take-out device 2 including the mold and the flange cover supports the high-pressure side cable 20 drawn out of the enclosure on the inner wall of the enclosure to maintain the level to some extent. As a result, bending or sagging of the high-pressure side cable 20 in the through-hole portion from which the high-voltage side cable 20 is drawn out is not generated. As a result, cable damage such as breakdown due to bending or sagging of the cable does not occur.

In the detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

As described above, according to the present invention, the high voltage side cable drawing device for the gas insulated water substation facility, the high voltage side cable is more stably drawn out from the transformer enclosure without the insulation member and the connecting member such as the high pressure bushing, the cable head, and the elbow. In addition, it is possible to more reliably prevent the external leakage of the cooling gas filled inside the enclosure. In addition, as the above members are not required, there is an advantage that the overall volume of the water substation facility is reduced, thereby being less constrained in space when installing the water substation facility.

Claims (6)

delete delete To draw the high voltage side cable from the inside of the transformer to the outside, An insulator provided on the high voltage side cable inside the enclosure; A sealing member that is mated with the insulator on the high voltage side cable; And And a flange cover which covers the assembly in which the insulator and the sealing member are joined in the enclosure and presses the flange in close contact with the inner wall of the enclosure in which a through hole is formed. The insulator is a conical shape gradually narrower toward one end, the sealing material is a high voltage cable pullout device for gas insulated water substation equipment, characterized in that the inner surface has a groove in which the conical insulator is joined. The method of claim 3, wherein The insulator outer surface and the sealing material inner surface, respectively, the high-voltage cable withdrawal device for gas insulated water substation equipment, characterized in that the uneven surface having a continuous curved waveform in the longitudinal direction of the insulator and the sealing material. The method of claim 4, wherein The length of the union in which the insulator and the sealing material are combined is greater than the depth of depression of the flange cover, so that when the flange cover is installed on the inner wall of the enclosure, the molded body is elastically deformed while being pressed between the flange cover and the inner wall of the enclosure. High pressure cable take-off device for equipment. The method of claim 5, wherein The flange cover is a gas insulated water, characterized in that the flange having a plurality of bolting holes are integrally formed on one side of the open end, the groove for recessing the sealing member is formed in one surface of the flange is provided with a sealing member installed in the groove High voltage cable drawer for substation equipment.

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