KR20030015215A - Adapter box for gas-insulated medium-voltage switchgear - Google Patents

Abstract

Adapter boxes for cables, transformers or fuse outgoing circuits of gas insulated medium voltage switchgears are constructed so as to prevent accidental arcing. For this purpose, the receiving frame 23 is constructed with a double overlapping portion 28 of the metal sheet. The last metal thin plate 20 extending forward is folded after forming the depth T1 of the receiving frame 23, and the folded metal thin plate is straight with a length L almost similar to the depth of the receiving frame 23. Extends rearward into the box. After the length 24 extends backwards, a curved portion 26 towards the side wall 21 is formed to form a cavity. This provides a baseline that can be included without immediate melting or plasma material for accidental arcing at the inner edge of the cavity.

Description

ADAPTER BOX FOR GAS-INSULATED MEDIUM-VOLTAGE SWITCHGEAR}

Adapter boxes of this kind are known: Pelten und Guileaume Anragen Geembeha in Krefeld (since October 1999) Brochure from user information: GE up to 24 kV, SF6 insulated, single compartment can be installed side by side Type medium voltage switchgear, document number E62.8D23.7. (Brochure from Felten & Guilleaume Anlagen GmbH in Krefeld (from October 1999) User Information: Mittelspannungs-schaltanlagen bis 24kV, SF6-isoliert, einfeldig anreihbar, Typ GE). The multi-compartment adapter box from the brochure has at least one intermediate wall as a partition which divides the inside of the box, and a receiving frame for a plug panel or front panel opens the box compartment. Installed in the front inlet area, two opposing marginal panels are bent into the inlet area and bent forward to form the depth of the receiving frame after a narrow strip is formed. A bolt with a head (for example a threaded bolt with a cap nut) is installed in the receiving frame to receive a hook element in the front panel, the front panel being the inlet. It is hooked by covering the area.

The front panel may typically be sealed by a lock or bolt for safety. The adapter box may be made of electroplated or painted sheet steel. A carrying handle may also be provided on the front panel.

Gas insulated medium voltage switchgear is often used in energy distribution companies' distribution networks in substations that do not have access to the personalnel because of their small dimensions. All cable terminals are installed in front of the gas container (entrance area). h.v.h.b.c. The fuse is encapsulated in an adapter box. It is possible to divide the box to provide each cable outgoing circuit or transformer outgoing circuit area.

As a result of a short circuit between the cable plugs, which can be caused as a result of insulation or a defect in the assembly, high voltages are generated in the box. There is a danger that the accidental arc puts the operating funnel at significant risk as a result of the plasma burning and smoking through the wall. It is therefore common to use a plurality of layers of sheet metal in the hazardous area or to use plastic or thick paper panels as linings. Although it is possible to increase the compressive strength and resistance to combustion as a result of the complex shaping of the walls, this does not provide an economical solution. In particular, in linings with panels of non-conductive material, there is a problem that the base point of the accidental arc is located at a few points not covered by the lining, and therefore there is a ground potential at that point. The uncovered point is therefore particularly dangerous from combustion.

The present invention relates to a metal single-section or multiple-section adapter box for a cable, transformer or fuse outgoing circuit of a gas insulated medium voltage switchgear according to the preamble of the independent claim.

Specific embodiments are shown in the drawings, each of which shows:

1 is a view of an adapter box having three compartments closed by a front panel,

2 is a right corner region (detailed view of A of FIG. 1),

3 shows the left corner area (detailed view of B of FIG. 1),

4 is an edge (detailed view of C in FIG. 1),

5 is a portion X of FIG.

6 shows the area of the intermediate wall (detailed view of D in FIG. 1).

In the figure, Pos A, B, C, and D represent detailed views of A, B, C, and D shown in FIG. 1, respectively.

It is an object of the present invention to provide a low cost but safe adapter box in which all of these can be protected from accidental arcing.

This object is achieved by the features of the independent claims. Further embodiments are provided in the dependent claims.

The core of the present invention is that a metal sheet (preferably on a longer vertical plane) of the forwardly curved edge is folded after forming the depth of the receiving frame, as a result of which the metal sheet is overlapped in duplicate and the folded metal The thin plate is made to extend rearward into the box in a straight line by a length approximately equal to the depth of the receiving frame, after which the vertical curved portion forms a cavity (in the form of a rectangular contour). The advantage of the structure is that a base point is formed for the accidental arcing at the inner edge of the cavity, which can be included and consumed without any molten or plasma state material that can immediately come out.

The cavity structure of the invention is preferably provided on the longer vertical longitudinal side of the inlet region. The narrower side of the inlet area can also be configured to fold to make a cavity. As will be mentioned, it is preferably proposed in particular that the structure of the upper edge of the front panel is connected in particular to the structure of the adjacent edge of the adapter box cover. The lower, narrower side of the front panel is located in an area less dangerous from accidental arcs. This means that a suitable structure according to the device of the invention can be dispensed with on the lower side of the front panel.

The curvature toward the side wall performed to make the cavity is preferably terminated from the side wall by a dimension of the thickness of the metal sheet. The spacing formed thereby allows the reinforcement or lining panels to be provided essentially at the back side of the side wall.

On two opposite longitudinal sides of the receiving frame, preferably on the vertical longitudinal side, at least one respective blind rivet is inserted for pressing on the front panel and on the blind rivet There is a large tofu. The blind rivet is located in a double overlapping portion of the side wall. Because of the large head and correspondingly large joint diameter, this flattens the front panel and allows it to be firmly held against the internally generated accidental arc pressure.

Preferably, the upper edge of the front panel is made U-shaped and made to open downward. The edge of the top cover facing the front panel is in this case folded vertically downwards towards the front panel and forms a narrow end strip. In replenishing the U-shaped structure of the upper edge of the front panel, it abuts the U-shaped folded portion (folded twice vertically) which is open towards the top, which receives the upper edge of the front panel. A cavity or labyrinth is formed inside the U-shaped structure in the cover and a corresponding portion is formed at the upper edge of the front panel, which is provided to prevent hot gas from coming out and to cool it.

In order to divide the box, at least one (preferably vertically) intermediate wall is installed straight forward from the inlet area, forming a second longitudinal side of the receiving frame, the depth of the receiving frame. After is formed it is folded (by 180 °), forming a double overlapping portion of the metal sheet, into which at least one blind rivet is inserted for the purpose of pressing the front panel.

Installed on the intermediate wall is a wall strip metal sheet that does not reach the depth of the box, which is fixed firmly to the intermediate wall. The wall strip metal sheet is bent vertically into the inlet area (not shown). After the narrow strip is formed, the wall strip metal sheet is bent vertically forward, and after the depth of the receiving frame is formed, it is 180 Fold by ° and form a double overlap of the metal sheet. The wall strip metal sheet completely folded in the area of the receiving frame extends rearward into the box in a straight line over a length comparable to the depth of the receiving frame, and the curved portion is perpendicular to the intermediate wall at its end. Is formed. The wall strip metal sheet is firmly fixed to the intermediate wall by short blind rivets.

The double overlapping portion of the metal sheet of the intermediate wall formed by full folding is connected to the wall strip metal sheet which is completely folded in the area of the receiving frame by a sleeve through which the blind rivet extends. In doing so, a high level of shear strenth is achieved by inserting the sleeve inside each metal sheet of a double overlapping portion of the metal sheet.

The edge of the upper horizontal cover facing the side wall folds vertically downwardly with respect to the side wall and forms a narrow end strip. The sidewalls are bent vertically into the box to form a connection with the cover. In extension to the end strip, the metal sheet of the cover is also formed into the box by vertical folding. There, the cover and the side wall are connected to each other. The lining sheet of the sidewall extending into the box extends beyond the connection between the cover and the sidewall (depth of the folded strip) and folds vertically downward with respect to the cover and forms a cavity. The folded portion also contributes to stabilization and refraction of the gas.

The front panel can be reinforced by a lining panel supported against the front panel with sealing means. On the rear part of the front panel, the lining panel is firmly fixed to the area of the carrying handle. The fixation is not visible from the front.

Preferably, the side wall of the box can also be reinforced by lining panels. Reinforcement or lining panels of this kind can be made from plastic or paperboard and attached by simple fastening means.

FIG. 1 shows an adapter box having three compartments which are sealed by three front panels 10 and made from metal, in which the detailed A, B, C and D regions are shown in more detail in the following figure. The adapter box has two intermediate walls 40 (detail D) as partitions in the cables, transformers, and fuse outgoing circuits therein.

A receiving frame 23 for the front panel 10 is configured in the inlet area 12 of each box compartment, which is opened forward. Here, the marginal metal sheet 20 forming the side wall 21 is folded vertically into the inlet region 12, bent, and formed after the narrow strip 13 is formed in the receiving frame 23. It is again bent vertically forwardly by the length corresponding to the depth T1.

A rivet 4 with a large head 6 is inserted into the receiving frame 23 to receive the hook element 14 provided on the front panel 10 (see FIG. 3). The front panel 10 may be hooked laterally on the rivet, so that the inlet area 12 is covered. The upper region of the front panel 10 is provided with a sealing element 16 which, for example, is lifted up therein when the front panel is in a closed position by a fastener at the upper edge of the receiving frame 23. Do not lose. The carrying handle 17 is attached to the lower area of the front panel. The front panel 10 may be reinforced inside by a lining panel 50. The lining panel together with the closure means (bolts or locks) 16 is supported against the front panel 10 at the top and fixed to the floor in the area of the carrying handle 17 and is not visible from the front.

The receiving frame is shown in the detail view of FIGS. 2 to 6. The receiving frame 23 is formed by a piece of marginal metal sheet extending forward.

The final metal sheet 20, which is bent forward by the vertically fold in duplicate and forms the depth T1 of the receiving frame 23, is fully folded backward by 180 °, resulting in a double overlapping portion of the metal sheet. 28 is formed. The double overlapping portion of the metal sheet provides the thickening of the material, where the rivets are particularly firmly supported.

The thin metal sheet folded by 180 ° extends rearward into the box in a straight line. The length L extending rearward into the box is about the same as the depth T1 of the receiving frame 23. After extending by the length L, the curved portion 26 is formed perpendicularly to the side wall 21. do. The bend forms a cavity in the corner of the adapter box. The bends 26 facing the side wall 21 do not all extend into the side wall but are terminated from the side wall at an interval of approximately the dimension of the thickness of the metal sheet (FIG. 4). The lining panel 50 ′ may be inserted into the space formed by the offset and fixed to the side wall at the rear of the box.

2 and 3 show the left and right sides of the upper edge 18 of the front panel 10. 3 shows a portion parallel to the side wall. The upper edge 18 of the front panel 10 is made U-shaped. The edge of the top cover 80 of the box facing the front panel 10 is folded vertically downward with respect to the front panel 10 and forms a narrow end strip 84 '. The U-shaped folded portion (twice vertically towards the top) abuts the U-shaped structure of the upper edge 18 of the front panel 10 and complements the upper edge 18 of the front panel 10 in a supplementary means.

Together with the folded portion of the upper edge 18 of the front panel 10, the folded strip 81 ′ and the folded portion 82 ′ form a cavity.

2 shows a portion parallel to the surface of the front panel. The edge of the top cover 80 facing the side wall 21 folds vertically towards the side wall 21 and forms a narrow end strip 84. The side wall 21 (right in FIG. 1) extends into the box (folded strip 81) to form a connection with the cover 80 and is not shown in more detail. Like the extension of the end strip 84, the thin metal plate of the cover 80 also extends into the box by folding vertically. The two elongated metal sheet strips and sidewalls 21 of the cover 80 are connected to one another there, for example by rivets. The thin metal plate 20 at the edge of the side wall extending into the box is longer and surpasses the depth of the folded strip 81 between the cover 80 and the side wall. The longer piece 82 folds up (toward the cover) and forms an open cavity there.

6 shows a structure of an intermediate wall for dividing inside a box in a box having a plurality of compartments. The thin metal plate of the intermediate wall 40 extends straight forward to the depth of the receiving frame and is fully folded by 180 ° and forms a double overlapping portion 28 'of the material. To form the lateral strip of the receiving frame of the adjacent inlet opening, a wall strip metal sheet 42 is used which does not extend completely into the depth of the box. The wall strip metal thin plate 42 is fixed to the intermediate wall 40 by at least one rivet 54.

The structure of the corner region according to the invention, described above, which has a sheet of metal extending into the box and folded to form a cavity, is also provided in the wall strip 42. The wall strip metal foil 42 forms the end and narrow strip 13 ′ which extends into the inlet region 12 by vertical folding. Due to the extension, the wall strip metal thin plate 42 bends vertically towards the front and then completely collapses (by 180 °). The folded portion (double overlapping portion of the thin metal plate) has the same depth T1 as the receiving frame 23. To form the cavity described above, the folded wall strip metal thin plate 42 extends rearward into the box in a straight line by a length L comparable to the depth T1 of the receiving frame 23 (reference numeral 24). There, a curved portion 26 is formed towards the intermediate wall 40. The folded portion terminates against the wall strip metal sheet without any gaps. As mentioned, the wall strip metal sheet 42 is secured to the intermediate wall 40 by rivets 54. The double overlapping portion 28 ′ of the sheet metal of the intermediate wall 40, formed by folding, is defined by the sleeve 53 in the region of the receiving frame 23 and the long blind rivet 55 extending into the sleeve. It is connected to the folded wall strip metal thin plate 42.

The invention described above is applicable to adapter boxes for cables, transformers or fuse outgoing circuits of gas insulated medium voltage switchgear.

Claims (9)

In the case of a multi-compartment box, at least one intermediate wall 40 is provided as a partition for dividing the inside of the box, and a receiving frame 23 for the front panel 10 is configured in the open inlet area 12 of the box compartment. A thin metal sheet 20, which forms a side wall 21, is bent into the inlet region 12 and a narrow strip 13 is formed and then forward by a length corresponding to the depth T1 of the receiving frame 23. Bolt 4 having the head 6 is inserted into the receiving frame 23 to receive the hook element 14 made in the front panel 10, the front panel 10 being A metal single compartment or multi compartment adapter box for a cable, transformer or fuse outgoing circuit of a gas insulated medium voltage switchgear hooked in a manner to cover the inlet area 12, The forward bent final metal sheet 20 forms the depth T1 of the receiving frame 23 and then folds and as a result a double overlapping portion 28 of the metal sheet is formed, the folded metal sheet Is extended rearward into the box in a straight line by a length L substantially similar to the depth T1 of the receiving frame 23, and the curved portion 26 toward the side wall 21 after the length L extending rearwardly. Adapter box for a gas insulated medium voltage switchgear, characterized in that it is made to form a cavity. The method of claim 1, Adapter side for gas insulated medium voltage switchgear, characterized in that the bends (26) facing the side wall are terminated from the side wall at intervals of the thickness of the metal sheet. The method according to claim 1 or 2, Adapter box for gas insulated medium voltage switchgear, characterized in that the bolt is made in the form of a rivet (4) with an extended head (6) and inserted into the receiving frame (23). The method according to any one of the preceding claims, The upper edge 18 of the front panel 10 is made U-shaped, the edge of the top cover 80 of the box facing the front panel 10 is folded and forms a narrow end strip 84 ', and the front A gas insulated medium voltage switchgear characterized by supplementing the U-shaped structure of the upper edge 18 of the panel 10 and abutting a U-shaped folded portion that accommodates the upper edge 18 of the front panel 10. Adapter box for. The method according to any one of the preceding claims, In the case of a multi-compartment box, a wall strip metal thin plate 42 which does not reach the inside of the depth of the box is formed in order to form the longitudinal side 22 of the receiving frame 23 lying in the partition inside the box. Arranged in parallel to and fixed to the wall strip metal sheet 42 extends into the inlet region 12, and after the narrow strip 13 ′ is formed, the wall strip metal sheet 42 is moved forward. Wall strip metal thin plates 42 that are bent, form and fold after forming the depth T1 of the housing frame 23, form a double overlapping portion 28 of the metal sheet, and folded in the area of the housing frame 23. ) Extends rearward into the box in a straight line over a length L substantially similar to the depth T1 of the receiving frame 23, and a curved portion 26 is formed toward the intermediate wall 40, and the wall strip is formed. The thin metal plate 42 is fixed to the intermediate wall 40 by means of rivets 54. Adapter box for insulated medium voltage switchgear. The method of claim 5, The double overlapping portion 28 of the metal sheet of the intermediate wall 40 formed by the folding 28 'is folded in the area of the receiving frame 23 by the sleeve 53 on which the long blind rivet 55 extends. Adapter box for gas insulated medium voltage switchgear, which is connected to a wall strip metal sheet (42). The method according to any one of the preceding claims, The edge of the top cover 80 facing the side wall 21 folds towards the side wall 21 and forms a narrow end strip 84, the side wall 21 at the depth of the folded strip 81. Extending into the box to form a connection with 80, and in extension to the end strip 84, the thin metal plate of the cover 80 also extends into the box and folded of the sidewall 21 and the cover 80. The final metal sheet 20 of sidewalls connected in the strip 81 and extending into the box extends beyond the depth of the folded strip 81 between the cover 80 and the sidewalls and extends the cover 80. Adapter box for a gas insulated medium voltage switchgear, which is folded toward a cavity to form a cavity (folded portion 82 '). The method according to any one of the preceding claims, The front panel 10 is internally provided by a lining panel 50 which, together with the closure means 16, is supported against the front panel 10 and is fixed to the interior of the front panel 10 in the region of the carrying handle 17. Adapter box for gas insulated medium voltage switchgear, characterized in that the reinforcement. The method according to any one of the preceding claims, Adapter box for a gas insulated medium voltage switchgear, characterized in that the reinforcement panel (50 ') made from metal or thick paper is arranged on at least one side wall (21).