WO2002087044A1

WO2002087044A1 - Connector housing for gas insulated medium-voltage substations

Info

Publication number: WO2002087044A1
Application number: PCT/EP2002/003440
Authority: WO
Inventors: Rolf Dirks; Klaus Naber
Original assignee: Felten & Guilleaume Ag
Priority date: 2001-04-19
Filing date: 2002-03-27
Publication date: 2002-10-31
Also published as: CN1461508A; EP1382101A1; NO20026092L; KR20030015215A; NO20026092D0; DE10119110C1

Abstract

The invention relates to a connector housing for a cable outlet, transformer outlet or fuse outlet in a gas insulated medium-voltage substation which is embodied in such a way that it can counter the occurrence of disruptive electric arcs in a reinforced manner. To achieve this, the receiving frame (23) is s provided with dual sheet metal (28). The edge-sided sheet of metal (20) which is drawn forward is folded back after the depth T1 of the receiving frame has been formed. The folded back sheet metal is brought straight back into the housing at a length L which is comparable to that of the depth of the receiving frame (23). An edge (26) oriented toward the side wall (21) is formed after the length (24) has been brought back to form a hollow area (rectangular profile), whereby a root is created for a disruptive electric arc on the inner edge of the hollow area. Said root can be fused off without any direct external discharge of the melt or plasma material.

Description

Connection housing for gas-insulated medium-voltage switchgear

description

The invention relates to a metallic single or multi-field connection housing for a cable, transformer or fuse outlet on a gas-insulated medium-voltage switchgear according to the preamble of the main claim.

Such connection housings are known: brochure from Feiten & Guilleaume Anlagen GmbH, Krefeld (10/1999) User information - "Medium-voltage switchgear up to 24 kV, SF6-insulated, single-bay, type GE" Document No. E62.8D23.7 A multi-field connection housing from the brochure has at least one partition as a housing division and on the open, front-side access area of a housing field there is a receiving frame for a plug-in or curtain panel, such that two opposite edge-side plates are bent into the access area and after forming one narrow strips to form the depth of the receiving frame are bent forward. In the receiving frame, bolts with a head (for example a screw bolt with a cap nut) are inserted to accommodate hook elements in the curtain panel, from which the curtain panel can be hooked covering the access area:

For safety reasons, the curtain can be locked with a bolt or lock. The connection housing can be made of galvanized or painted sheet steel. A handle can also be provided on the curtain panel.

Due to their small dimensions, gas-insulated medium-voltage switchgear is often used in non-accessible network stations in the distribution network of energy supply companies. All cable connections are located on the front of the gas container (access area). The HV fuses are also located there due to the required accessibility. As protection for the operating personnel, the cable connections and HV fuses are encapsulated with the connection housing. A housing subdivision can be provided for a cable or a transformer outlet area.

In the event of short circuits between cable plugs, which can result from insulation or assembly errors, high pressures occur in the housings. There is also the danger that the arcing faults melt the walls and the operating personnel are considerably endangered by emerging plasma clouds. It is therefore common to use multi-layer metal sheets in hazardous areas or to use plastic or hard paper panels as a lining. The pressure resistance and the resistance to burn-through can be increased by complex design of the walls, but this rarely leads to economical solutions. In particular, when lining with non-conductive material plates, the problem arises that the base point of an arcing fault “settles” at the few points not covered by the lining, since there is earth potential there. The areas not covered are therefore particularly at risk of burning.

It is an object of the invention to design an inexpensive, but stable and, above all, arc-proof connection housing.

The solution can be found in the features of the main claim. Further developments are presented in the subclaims.

The essence of the invention is that the forward-bent edge-side sheet (preferably the longer vertical side) is folded over after the depth of the receiving frame has been formed, which results in a sheet metal doubling, and the folded sheet has a length comparable to the depth of the receiving frame in the housing has just been returned and, after the returned length to form a cavity (in the form of a rectangular profile), a vertical bend is formed towards the side wall. The advantage of this design is that a base point is created for an arcing fault on the inner edge of the cavity, which point can be melted and consumed without melting or plasma material being able to escape directly to the outside. The formation of the cavity according to the invention is preferably provided on the longer, vertical longitudinal side of the access area. The narrower sides of the access area can also be formed with such an edging to form a cavity. As will be shown, a special configuration of the upper edge of the curtain panel in connection with a special configuration of the adjacent edge of the cover of the connection housing is preferably proposed. The lower, narrower side of the curtain is located in a zone that is less at risk from arcing faults. It is therefore possible, if necessary, to dispense with an embodiment according to the arrangement according to the invention on the lower side of the curtain panel.

The fold to the side wall that is used to produce the cavity preferably ends at a distance of one sheet thickness from the side wall. The gap created in this way permits subsequent backing with a reinforcement or lining plate on the side wall.

In two opposite longitudinal sides - preferably the vertical long sides - of the receiving frame, at least one blind rivet is pulled in to attach the curtain panel, on which a large head is formed. The blind rivet sits in the doubling of the side wall. With the large head and a correspondingly thick collar diameter, it guides the curtain panel flat and protects against the internal pressure of an arcing fault.

The upper edge of the curtain panel is preferably U-shaped and open at the bottom. In this case, the edge of an upper cover facing the curtain panel is folded vertically downwards to the curtain panel and forms a narrow end strip. Complementary to the U-shaped design of the upper edge of the curtain panel, there is an upwardly open U-shaped edging (bent twice vertically) which receives the upper edge of the curtain panel. In the U-shaped design in the lid and the equivalent in the upper edge of the curtain, a cavity or labyrinth is created, which serves to prevent the escape and to cool hot gases. For the subdivision of the housing, at least one (preferably vertical) intermediate wall for forming a second longitudinal side of the receiving frame is pulled straight out of the access area and folded over after forming the depth of the receiving frame (by 180 °), with a sheet metal doubling, into which at least one blind rivet has been pulled in to attach the curtain panel.

On the intermediate wall, a wall strip plate, which does not extend to the depth of the housing, is arranged and fastened to the intermediate wall. The wall strip is bent vertically into the access area (retracted). After forming a narrow strip, the wall strip plate is bent vertically forwards and, after the depth of the receiving frame has been formed, it is bent over by 180 °, which results in a doubling of the plate. The wall strip sheet which has been completely folded over in the area of the receiving frame has just been fed back into the housing to a length comparable to the depth of the receiving frame and a vertical bend is formed at its end towards the intermediate wall. The wall strip is attached to the partition with a short blind rivet.

The sheet metal doubling of the intermediate wall created by complete folding is connected to the wall strip sheet which has been completely folded over in the area of the receiving frame by a sleeve, in which a long blind rivet is guided. A high shear strength is achieved by immersing the sleeve in one sheet of the sheet doubling.

The edge of an upper, horizontal lid facing the side wall is folded down vertically towards the side wall and forms a narrow end strip. The side wall is bent vertically into the housing to establish a connection with the cover. In continuation of the front strip, the sheet metal of the cover is also drawn into the housing by means of a vertical fold. There the lid and the side wall are connected to each other. The cladding plate of the side wall drawn into the housing is connected beyond the connection (depth of an edging strip) between the cover and the side wall. elongated and folded to the lid - forming a cavity - vertically upwards. This upward edging also contributes to stabilization and gas deflection.

The curtain panel can be reinforced with a lining plate which is held on the curtain panel together with the closure means. The lining plate is fastened in the area of a handle on the back of the curtain panel. The attachment is invisible from the front.

A side wall of the housing can preferably also be reinforced with a lining plate. Such reinforcement or lining panels can consist of plastic or hard paper, which are attached with simple fastening means.

An embodiment follows in the drawings, the figures showing in detail:

1 is a view of a three-field connector housing closed with curtain panels,

2 shows the right corner area (position A from FIG. 1),

3 the left corner area (position B from FIG. 1), FIG. 4 the edge (position C from FIG. 1),

Fig. 5 shows the detail X from Fig. 4 and

Fig. 6 shows an area of the partition (position D from Fig. 1).

1 shows a three-field connection housing made of metal closed with three curtain panels 10, in which detail areas A, B, C and D are shown in the following figures for further description. The connection housing has two partition walls 40 (position D) as a housing subdivision for cable, transformer or fuse outlets.

A receiving frame 23 for a curtain panel 10 is formed on the front open access areas 12 of each housing panel. Here, an edge-side sheet 20 forming a side wall 21 is bent vertically into the access area 12 and bent in, and after forming a narrow strip fens 13 again bent vertically forward with a length of the depth T1 of the receiving frame 23 accordingly.

Rivets 4 with a large head 6 are drawn into the receiving frame 23 for receiving hook elements 14 present in the curtain panel 10 (see FIG. 3). The curtain panels 10 can be hooked onto the side of the rivets, as a result of which the access area 12 is covered. In the upper area of the curtain panels 10 there are closing elements 16 which, for example, prevent the curtain panel from being lifted on the inside with a sash on the upper edge of the receiving frame 23 in the closed position. A handle 17 is attached in the lower region of the curtain panel. The curtain panel 10 can be reinforced on the inside with a lining plate 50. The lining plate is held at the top together with the locking means (bolt or lock 16) on the curtain panel 10 and fastened at the bottom in the area of the handle 17 without being visible from the front.

The receiving frame is shown in the details of Figures 2 to 6. The receiving frame 23 is produced by pulling forward sections of the edge-side plates.

The edge-side sheet metal 20 which is bent forwards by two vertical folds and which forms the depth T1 of the receiving frame 23 is completely folded back by 180 °, as a result of which a sheet metal doubling 28 is produced. Sheet metal doubling is material reinforcement in which the rivets are given special support.

The sheet bent over by 180 ° has just been returned to the housing. The length L of the return into the housing is comparable to the depth T1 of the receiving frame 23. After the returned length L, a vertical bevel 26 is formed towards the side wall 21. The bevel creates a cavity in the corner of the connection housing. The fold 26 to the side wall 21 is not fully guided to the side wall, but ends at a distance of approximately one sheet thickness from the side wall (FIG. 4). In the space created by a distance a lining plate 50 'is inserted, which can be fastened to the side wall in the rear region of the housing.

2 and 3 show the upper edge 18 of the curtain panel 10 on the right and left. FIG. 3 shows a section parallel to the side wall. The upper edge 18 of the curtain panel 10 is U-shaped. The edge of the upper cover 80 of the housing facing the curtain panel 10 is folded downwards perpendicularly to the curtain panel 10 and forms a narrow end strip 84 '. Complementary to the U-shaped design of the upper edge 18 of the curtain panel 10 is followed by a U-shaped edge (twice vertically upwards), which receives the upper edge 18 of the curtain panel 10. Together with the edging of the upper edge 18 of the curtain panel 10, a hollow space is formed by the edging strip 81 'and the edging 82'.

Fig. 2 shows a section parallel to the surface of the curtain. The edge of the upper cover 80 facing the side wall 21 is folded over perpendicularly to the side wall 21 and forms a narrow end strip 84. The side wall 21 (according to FIG. 1 on the right) is drawn into the housing to produce a connection (not shown) with the cover 80 (Edging strip 81). As a continuation of the front strip 84, the sheet metal of the cover 80 is also drawn into the housing by means of a vertical fold. The two retracted metal strips of the cover 80 and the side wall 21 are connected to one another there, for example by means of a rivet. The edge-side sheet metal 20 of the side wall drawn into the housing is longer beyond the depth of the edge strip 81 between the cover 80 and the side wall. The longer section 82 is folded upwards (to the cover) and forms an open cavity there.

Fig. 6 shows the formation of an intermediate wall for dividing the housing of a multi-field housing. The sheet metal of the intermediate wall 40 is pulled straight forward in the depth of the receiving frame and folded over completely by 180 ° and forms the material doubling 28 '. To produce the side strip of the receiving frame of the adjacent access opening, a wall strip plate 42 is used, which is not completely led into the depth of the housing. The Wall strip plate 42 is fastened to the intermediate wall 40 with at least one rivet 54.

The above-described configuration of the corner region with sheet metal drawn into the housing and edging to form a cavity is also carried out on the wall strip 42. For this purpose, the wall strip plate 42 is drawn into the access area 12 by a vertical fold and forms a narrow strip 13 '. Continued, the wall strip plate 42 is bent vertically forward and then completely folded (by 180 °). The edging (sheet metal doubling) has the same depth T1 as the receiving frame 23. To form the cavity described above, the folded-over wall strip sheet 42 has just been returned to the housing to a length L comparable to the depth T1 of the receiving frame 23 (reference numeral 24). There, the bend 26 to the intermediate wall 40 is formed. The edge ends without a gap on the wall strip sheet. As mentioned, the wall strip plate 42 is fastened to the intermediate wall 40 with a rivet 54. The sheet metal doubling 28 'of the intermediate wall 40 which is produced by folding is connected in the region of the receiving frame 23 to the folded-over wall strip sheet 42 by a sleeve 53 and long blind rivet 55 guided therein.

LIST OF REFERENCE NUMBERS

Special blind rivet 4

Collar 5 big head 6

Curtain panel 10

Access area 12

Hook 14

Closure 16

Handle 17

Top edge 18 of the curtain panel

Lower edge 18 'of the curtain panel

Bending in the upper area 19 edge sheet 20

Side wall 21

Long side 22

Recording frame 23

Depth of sheet 24

Edge 26

Double sheet 28

Fold 28 '

Partition 40

Wall strip plate 42

Reinforcement plate 50

Sleeve 53 short blind rivet 54 long blind rivet 55 upper cover 80

Edge strips 81, 81 '

Edging 82, 82 '

Forehead strips 84, 84 '

Claims

claims

1. Metallic single or multi-field connection housing for a cable, transformer or fuse outlet on a gas-insulated medium-voltage switchgear, with a multi-field housing at least one partition (40) being provided as a housing subdivision, with an open access area (12) of a housing field Receiving frame (23) for a curtain panel (10) is formed such that a sheet (20) forming an edge and forming a side wall (21) is bent into the access area (12) and, after forming a narrow strip (13), has a length of Depth (T1) of the receiving frame (23) is bent accordingly, and bolts (4) with a head (6) for receiving hook elements (14) present in the curtain panel (10) are introduced into the receiving frame (23), whereupon the curtain panel (10 ) the access area (12) can be hooked on, characterized in that the edge sheet (20) bent forward is formed after the depth (T1) of the receptacle frame (23) is folded back, which results in a sheet doubling (28), and that the folded sheet is returned to a length (L) comparable to the depth (T1) of the receiving frame (23) in the housing and after the returned length ( L) a bend (26) to the side wall (21) is formed to form a cavity.

2. Connection housing according to claim 1, characterized in that the bend (26) to the side wall (21) ends at a distance of one sheet thickness from the side wall.

3. Connection housing according to claim 1 or 2, characterized in that a bolt is designed as a rivet (4) drawn into the receiving frame (23) with an enlarged head (6).

4. Connection housing according to one of the preceding claims, characterized in that the upper edge (18) of the curtain (10) U-shaped It is formed that the edge of an upper cover (80) of the housing facing the curtain panel (10) is folded over to the curtain panel (10) and forms a narrow end strip (84 ') and is complementary to the U-shaped design of the upper edge (18) of the The curtain panel (10) connects a U-shaped edge that receives the upper edge (18) of the curtain panel (10).

5. Connection housing according to one of the preceding claims, characterized in that in the case of a multi-field housing for forming a longitudinal side (22) of the receiving frame (23) lying in a housing subdivision, a wall strip plate (42) which does not extend to the depth of the housing , arranged parallel to an intermediate wall (40) and fastened with it, that the wall strip plate (42) is drawn into the access area (12), that after forming a narrow strip (13 ') the wall strip plate (42) is bent forwards and backwards Formation of the depth (T1) of the receiving frame (23) is folded over, whereby a sheet metal doubling (28) occurs that the wall strip sheet (42) folded over in the area of the receiving frame (23) has a length (L) comparable to the depth (T1) of the receiving frame (23) straight back into the housing and a bend (26) to the intermediate wall (40) is formed, and that the fastening of the wall strip plate (42) with the intermediate wall (40) with a rivet (54) is made.

6. Connection housing according to claim 5, characterized in that the sheet metal doubling (28) of the intermediate wall (40) resulting from the folding (28 ') with the wall strip sheet (42) folded over in the region of the receiving frame (23) through a sleeve (53) and is connected in the guided long blind rivet (55).

7. Connection housing according to one of the preceding claims, characterized in that the edge of an upper cover (80) facing the side wall (21) is folded over towards the side wall (21) and forms a narrow end strip (84) that the side wall (21) to establish a connection with the cover (80) in the depth of a folding strip (81), that the sheet metal of the cover (80) is also pulled into the housing in a continuation of the front strip (84) and on the folding strip (81 ) the cover (80) and the side wall (21) are connected, and that the edge-side sheet (20) which is inserted into the The side wall retracted beyond the depth of the edging strip (81) between the cover (80) and the side wall is extended and folded over to the cover (80) - forming a cavity (edging 82 ').

8. Connection housing according to one of the preceding claims, characterized in that the curtain panel (10) is reinforced on the inside with a lining plate (50) which is held together with the closure means (16) on the curtain panel (10) and on the inside the curtain panel (10) is fastened in the region of a handle (17).

9. Connection housing according to one of the preceding claims, characterized in that a reinforcing plate (50 ') made of metal or hard paper is drawn in on at least one side wall (21).