DE8816901U1 - Switchgear panel for an encapsulated medium-voltage switchgear - Google Patents

Description

Pt No. 619 "Switch panel for an encapsulated medium-voltage switchgear"

The invention relates to a switchgear panel for an encapsulated medium-voltage switchgear, according to the preamble of the first patent claim.

! In the known switchgear of the type mentioned, e.g.

■i the switchgear panels of the WK series, version C of the

Sachsenwjerk AG, the framework of a switchgear panel consists of

if strong professional frame, which is secured at the front by a

| ^: ; Sheet steel door and at the back by a screwed

!-■ Sheet metal plate is covered. The latter also applies to the

End walls of a complete switchgear, while in some systems there are also full-surface panel separators between individual switchgear panels or panel separators that leave space for the busbars.

? ^i; walls are provided. The busbars are either

Field and phase by an insulator or by means of a

the field partition wall, while the counter contacts for the switchgear are attached to other insulators. The equipment in the outgoing branch of the switchgear panel, such as current and voltage transformers as well as earthing switches and counter contacts for the switchgear are at least partially attached to the back of the panel. Fastening profiles screwed or welded into the frame are used to hold the built-in devices.

-9- Pt No. 619

)The assembly of the known switch panels takes place in the following steps:

1. Assembly of the complete scaffolding including the fastening profiles to form a three-dimensional body; disadvantage: large, air-filled volume during the time required to prepare and install the equipment.

2. Installation of the various devices individually into the frame; alignment of the devices according to the assembly template; i.e., long service life on the assembly surface.

3. Completion of the switchgear panels with doors, sheet metal covers and, if necessary, bulkheads; installation of the drives and locks. Insertion of the switchgear.

The installation of busbars and cable terminations takes place at the installation location of the switchgear.

The lower limit of the switchgear panels is formed by a flat, thin sheet metal plate on which the rollers of the switchgear carriage run. Sometimes U-shaped rails are provided to guide the switchgear carriage. In any case, this design results in

-10 Pt No. 619

At least at the points where the rollers of the switching carriage run in, there is a gap between the lower edge of the door and the sheet metal through which hot arc gases can escape in the event of a fault. In addition, installing the switchgear on an uneven, rough building floor is problematic, since at least the non-stiffened sheet metal plate deforms due to the unevenness, making it difficult or even impossible for the switching carriage to run into the counter contacts.

-11- Pt-No.

The object of the present invention is to improve the switch panels of the specified type with regard to contact protection and personal safety and to design them in such a way that the switch panels can be assembled in the factory with a short time in the assembly department using prefabricated and largely pre-assembled modules with a relatively small installation depth.

The problem is solved according to the invention by applying the following features:

a) The rear wall (1) forms a rigid tray closed on all sides with a high edge, in which fastening options for the busbars (8a, b, c)

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the counter contacts (9, 12) are intended for the switching carriage (6) and for other permanently installed equipment,

b) the front frame (2) consists of a multi-profiled base plate (23), a multi-profiled side rail on the left (21a) and right (21b) and a profiled upper cross profile (22), which are connected to one another.

-12- Pt No. 619

are rigidly connected and form a continuous, gap-free stop surface for the lür (7) with a collar (24) on the front side,

c) on the base plate (23) is left and right

a tapping surface arranged at a distance (K) 7nr the lower edge of the switch panel in the form of an angle (27) for the

&PSgr;- rollers (25) of the switching carriage (6) are placed,

d) the collar (24) of the base plate (23) is notched in extension of the angle (27) up to the dimension (K), whereby (K) also allows a gap-free stop of the closed door (7), and

e) a drive-on aid that is effective when the door (7) is open enables the switching carriage (6) to be driven into the interior of the switching panel onto the brackets (27).

In the switchgear according to the invention, the contact protection and personal safety are improved by the step on the front frame corresponding to dimension K, because now the

closed door closes without a gap even at the points where the rollers enter the control panel.

The tub-shaped design of the rear wall means that there are no holes on the back

-13- Pt No. 619

or other passages for screws or other fastening devices create permanent or temporary openings.

The inventive design of the rear wall and the front frame, together with the connecting profiles, also improves the rigidity of the body as a cube, so that the risk of deformation in the event of a fault is relatively low, although the material used for these parts corresponds to that in known designs.

With the components according to the invention, it is also possible to implement a step-by ^- step assembly method for medium-voltage switchgear, which has a positive effect on both costs and throughput times in the factory.

-14- Pt-No.

For a precise understanding of the present invention, please refer to the following drawings. In detail:

Figure 1 Section through an inventive control panel. Figure 2 Section of the scaffold. Figure 3 View of the scaffolding. Figure 4 Rear panel assembly procedure

in side view.

Figure 5 View "Y" to Figure 4. Figure 6 Section A-B of the scaffolding. Figure 7 View "X" from Figure 1. Figure 8 Top view of Figure 7. Figure 9 .... Section through an inventive

Switchgear panel with busbar partition.

-15- Pt-No.

The switchgear panel according to the invention consists, according to Figure 1, of a frame 3, a switchgear carriage 6 and a control cabinet 15 for the low-voltage equipment. The frame 3 consists of the rear wall 1, the front frame with the door 7, the left and right upper profiles 4a, 4b and the left and right lower profiles 5a, 5b.""On the rear wall 1 are all permanently installed equipment such as the busbars 8a, 8b and 8c, their counter contacts 9 for the upper insertion contacts of the circuit breaker 32, a current transformer 10 per phase with a built-in counter contact 12 for the lower insertion contacts of the circuit breaker and an earthing switch 11. The switchgear carriage 6 works together with these permanently installed parts, on which a circuit breaker 32 or a load switch with an upper and a lower insertion contact per phase is usually installed as a switching device. In a metal-encapsulated switchgear, several switch panels are usually located next to each other and are connected to each other by the busbars 8a, b, c already mentioned. The front cover of the switch panel is formed by the door 7 and the control cabinet 15 with its door, while the rear cover is formed by the rear wall itself. An upper cover, e.g. in the form of pressure relief plates, is not mentioned in the present description, since it is of no importance for the invention.

-16- Pt-No.

is. Between the individual fields, a partition made of insulating material or metal can be provided in the usual way. For the connection of a consumer, a discharge line 18 is provided for each phase, to which the cable end closure 13 can be connected. In Figure 1, the switching carriage 6 is shown in the operating position; in the disconnected position, it is also still behind the closed door 7.

From Figures 2 and 3 it can be seen that the return

: wall 1 as a fully enclosed tub with height H

s, It can be made of a sheet metal plate with welded edges and gold flanges on all sides.

;S, on whose sides left and right angles 33a, b, c, d

or similar for the accommodation of supports for fastening the permanently installed equipment. When fastening the angles 33a, b, c, d, the method of so-called hole welding 37 can be used. A U-shaped support 19 for fastening the support insulators 14 with the counter contacts 9 and the connecting rails 16, 17 is screwed to the two upper angles 33a and b, while a plate 20 for fastening the current transformers 10 with the counter contacts 12 and the earthing switch 11 is screwed to the two lower angles 33c and d.

-17- Pt-No.

Due to the inventive arrangement of the support insulators 14 and the connecting rails 16 for the busbars 8b and 8c lying in a vertical plane, the forces acting on the latter in the event of a multi-phase short circuit are transmitted through the straight connecting rails 16 to the support insulators 14, whereby the rails only experience tensile and compressive loads and thus cannot be deformed. The known switchgear systems use cranked or angled connecting rails in all phases, which are loaded in the bending direction and can therefore be easily deformed. Therefore, supports for both the busbars and the counter contacts are required and present in all phases. In the switchgear system according to the invention, only the busbar 8a needs to be additionally supported with an insulator 35 due to the cranked connecting rail 17 in the event of high short-circuit power in each switchgear panel. The arrangement according to the invention is particularly advantageous for use in switchgear systems in which no partitioning is provided between the switching fields in the busbar area.

-18- Pt-No.619

With the rear wall 1 according to the invention, an advantageous method for assembling the switchgear panel, in particular the frame with the permanently installed drive means η, can be achieved. In this case, both the support 19 and the plate 20 with the respective, already specified equipment can be built up as an assembly Λ in an ergonomically favorable position on the ^flat rear wall 1 according to Figures 4 and 5. By using a simple assembly gauge, not shown in detail, the dimensions used as test dimensions can be set:

a Connection height between line 18 and

Lower edge of the field, which is given by the corresponding flanged edge of the rear wall 1

b Height of the lower entry counter contacts

c Height of the upper entry contacts

d _1> d-,d ₃ Side distances of the connecting parts.

With normal manufacturing tolerances, the points at which the busbars 8a, b, c are screwed to the connecting bars 16, 17 do not need to be fixed in the assembly jig.

-19_ Pt-No.

As assembly B, a welding group of the front frame 2 with the two side members 21a, 21b, the cross profile 22, the base plate 23 and the two angles is prefabricated using suitable templates.

According to Figures 2, 3 and 6, the front frame 2 contains a left and a right side member 21a, 21b, a cross-section 22 and a base plate 2J. The above-mentioned parts are made of sheet metal, are angled several times to increase rigidity and, after welding together, form a collar 24 running all the way around the front, which forms a labyrinth with the door 7 when it is closed, which improves contact protection and makes it more difficult for hot gases caused by arcing to escape. This collar is only interrupted at the two points where the rollers 25 of the switch carriage 6 retract. At these two points, the base plate 23 has a notch, behind which an angle 27 is welded in as a track for the rollers. The notch and angle 27 have a height K relative to the lower edge of the field, which is so large that the lower edge of the closed door 7 strikes the front of the base plate 23 without a gap. (See Figure 1). The welded angles 27 have a length determined by the required travel path of the switching carriage 6 and

.20- Pt No. 619

stiffen the base of the control panel considerably. The side members 21a, 21b are recessed in the upper part and provide space for the installation of the control cabinet 15.

The assembly of the modules A and B to form a complete frame is carried out using the upper (4a, 4b) and lower profiles (5a, 5b) using screw technology. Only then is the assembly surface for the switch panels required, whereby a significantly shorter occupation time is required compared to the conventional method. The modules mentioned are assembled to form the complete frame on the switch panel assembly surface or a special assembly frame with a swivel frame and the like. The screw connections at the individual nodes are easily accessible, so that the entire connection work only requires a short time.

Figures 2, 3 and 6 also show how the rear wall 1 and the front frame 2 are connected to one another. The upper, U-shaped profiles 4a and 4b butt against the flanged edge of the rear wall 1; an angled gusset plate 28 and 29 is welded to each profile on both sides, preferably using "hole welding" 37. The profiles are screwed to the rear wall 1 and the front frame 2 with the free ends of the gusset plates.

-21- Pt No. 619

The lower connection between rear wall 1 and front frame 2 is made according to Figures 2 and 3 by profiles 5a and 5b, which are C-shaped with a very high steq. The steq faces the inside of the switchgear and serves as a metallic cover between the active parts in the switchgear and the low-voltage control cables laid within the profile.

The assembly process described allows a time-saving, ergonomically favorable method to be used according to the invention for the assembly of high-voltage switchgear. This further improves the flexibility of the production department by significantly reducing the time required to assemble the entire switchgear. Due to the prefabricated assemblies A and B, the assembly areas can also be assembled using the prefabricated assemblies A and B.

for medium voltage circuits shorten tan 1ages.

The frame assembled in this way is finished to the extent that any switching carriage 6, whose connection points are also determined in a known manner in a prefabricated manner, can be moved in after the door 7 has been attached. The last step is the internal assembly of the rod connection to the earthing switch and the associated

-22- Pt-No.

Interlocks between the switching trolley drive, earthing switch drive and LV plug.

To bridge the height K determined by the angle 27 for the switching carriage 6 to be retracted, according to Figures 7 and 8, pivotable ramps 34 are attached to the front frame 2 according to a further feature of the invention. When the door 7 is closed, the ramps 34 are held in the folded-up position by friction, which is produced, for example, by a spring-loaded bolt connection 36. They are extended for the retraction or extension of a switching carriage 6; their shape with a U-shaped cross-section ensures that the switching carriage 6 enters in the correct position, and the use of the ramps 34 also enables safe operation on uneven floors of the plant buildings that lead to differences in level between the lower edge of the switch panel and the fastening surface. Switching springs according to the invention mentioned can just as well be equipped with a partition, in our example with a busbar partition 31, according to Figure 9. To install such partitions, mounting brackets 30 are installed between the upper profiles and a corresponding holder is installed on the

Pt-No. 619 ■ &igr; ■ · · · · &ggr;' * · · · ■ t · · • ■ * * - · I

-23-

Rear wall 1 and the base plate 23. Figure 9 also shows that the busbars 8a, b, c can consist of 2 conductors per phase in order to be able to carry larger nominal currents.

In summary, the invention improves the control panels in the following ways:

1. The control panel door closes without a gap on all sides, even at the points where the rollers of the control trolley extend and retract. Fold-out support rails compensate for unevenness in the installation surface.

2. The back panel is completely smooth and has no holes for fastening or connecting parts. There are no fastening elements, such as screw heads or the like, protruding from the back panel.

3. The design of the rear wall as a closed trough results in high corner rigidity and tightness against escaping hot gases from arc faults.

4. The design of the front frame with welded angles for the rollers of the switch carriage, together with 3.), considerably increases the dimensional rigidity of the entire switch field frame .

-24- Pt-No.

The assembly of the switchgear panels according to the invention takes place in production in the following steps:

1. Assembly and fitting of the rear wall module in a pre-assembly department using a simple assembly jig.

2. Simultaneous, but completely independent of 1.) production of the front frame as a welding group.

3. Assembly of the modules manufactured under 1.) and Z.) - if necessary after more or less long intermediate storage - to form the control panel, short standing time on the assembly surface.

4. Completion of the switchgear panels with doors, sheet metal covers and, if necessary, bulkheads; Installation of the drives and locks. Installation of the switchgear carriages.

The division into independent pre-assembly steps and a final assembly step that can be carried out at any time ensures a high level of flexibility for the production plant and compliance with short-term delivery options for the sales department.

_ ₂₅ _ Pt-No.

Reference numbers

Back wall 1

Frontrahipen 2

Scaffolding 3

left and right

upper profile 4a, 4b

left and right

lower profile 5a, 5b

Switch car 6

Door 7

Busbars 8a, 8b, 8c

Counter contact on busbar 9

current transformer,.. 10

Earthing switch 11

Counter contact for connection 12

Cable termination 13

Post insulator ....·· 14

Steaerschrank 15

Connecting rail 16

cranked connecting rail 17

Derivation ... 18

Carrier 19

Plate 20

-?6- Pt-No

left and right side rails 21a, 21b

Cross section 22

Base plate 2 3

Collar 24

RoI Ie 2 5

Notch 26

Angle 2 7

Gusset plate 28

Gusset plate 29

Mounting bracket 30

Bulkhead 31

Circuit breaker 32

Mounting bracket 33a, b,

Loading ramps 34

I sol iertei1 35

spring-loaded bolt connection 36

Hole welding 37

Claims (10)

_1_ Pt No. 619 Claims 1. Switchgear panel for an encapsulated medium-voltage switchgear, consisting of a switch room with switchgear, a busbar area and a connection area, in which - the control panel is enclosed in a housing, which is assembled from plate- and/or frame-shaped, preferably profiled sheet metal parts and has a rear wall, a front door, upper pressure relief plates or flaps as well as a floor plate or rails for moving the switching carriage as external covers, - in the housing, preferably in the rear area, permanently installed equipment such as busbars, measuring transformers, earthing switches and fixed counter contacts for the switching trolley are attached to the frame or to special installation profiles, - the busbars are arranged in a vertical plane and supported at least once per phase, -2- Pt-No. I - the fixed counter contacts of the busbars p arranged in a horizontal plane and &iacgr; each on a resource or separate Insulating part are supported and the stationary counter contacts of the connection area are arranged in a horizontal plane, characterized by the features: &rgr; a) the rear wall (1) forms a closed • rigid tub with high edge, in the fastening options for the busbars (8a,b,c) the current transformers (10) the earthing switch (11) 4 and the counter contacts (9, 12) for the switching carriage ?;■ (6) and for other permanently installed operating Q funds are provided, b) the front frame (2) consists of a multi-profiled base plate (23), a multi-profiled side rail on the left (21a) and right (21b) and a profiled upper cross profile (22), which are rigidly connected to one another and form a continuous, gap-free stop surface for the door (7) with a collar (24) on the front side, -3- Pt-No. c) on the base plate (23) on the left and right there is placed a running surface in the form of an angle (27) for the rollers (25) of the switching carriage (6) arranged at a distance (K) from the lower edge of the switch panel, d) the collar (24) of the base plate (23) is notched in extension of the angle (27) up to the dimension (K), whereby (K) also allows a gap-free stop of the closed door (7), and e) a drive-on aid which is effective when the door (7) is open enables the switching carriage (6) to be driven into the interior of the switching panel onto the brackets (27). -4- Pt-No. 2. Switch panel according to claim 1, characterized, that for each phase, a support insulator (14) carries the counter contact (9), which is connected to the associated busbar (8a, b, c) via a connecting bar (16, i7), the connecting bars (16) of the two busbars (8b, 8c) adjacent to the support insulators (14) being designed to be straight. 3. Switch panel according to claim 2, characterized, that the busbar (8a) not adjacent to the support insulators (14) is connected to its counter contact (9) by a cranked connecting bar (17) and, depending on the size of the maximum short-circuit power, can be supported against the rear wall by an additional insulating part (35). · 4 · -5- Pt-No. 4. Switch panel according to claim 1, characterized, that the counter contacts (12) are attached to one of the operating devices provided in the connection area, e.g. current transformer (10). 5. Switch panel according to claim 1, characterized, that the upper profiles (4a, 4b) are butt-jointed to the rear wall (1) and the side members (21a, 21b) and are connected to these parts by means of welded gusset plates (28, 29) stiffened by bending. 6. Switch panel according to claim 1 or 5, characterized in that the rear wall (1) is designed as a sheet metal tray welded at the corners and fastening angles (33a, b, c, d) are welded on. -δ- Pt-No. 7. Switch panel according to one of claims 1, 5 or 6, characterized, that a process known per se as "plug welding" is used as the welded connection (37). 8. Switch panel according to claim 1,
characterized, that fold-out ramps (34) overcome the height difference (K) for the rollers (25) when the switching carriage (6) is extended and retracted. 9. Switch panel according to claim 8,
characterized, that the ramps (34) can be swivelled under self-locking and are located within the switching field when the door (7) is closed. &igr; a · I ■ · _7- Pt No. 619 10. Switch panel according to claim 8 or 9, characterized in that the ramps (34) have a U-shaped profile for guiding the switching carriage (6).