WO1991003089A1

WO1991003089A1 - Encapsulated medium-voltage cubicle

Info

Publication number: WO1991003089A1
Application number: PCT/EP1990/001342
Authority: WO
Inventors: Jürgen NIKLASS; Heinz Schellhas
Original assignee: Ritter Starkstromtechnik Gmbh & Co.
Priority date: 1989-08-23
Filing date: 1990-08-16
Publication date: 1991-03-07
Also published as: EP0447503A1; DE3927835A1

Abstract

Encapsulated and compartmented medium-voltage cubicle (20) with withdrawable carriages or crates (12) for the connection as desired of an output to one of the two busbars (3) of a twin-busbar installation by means of a connector (10) arranged on the carriage or crate (12), with plug connections (28, 30; 32, 4, 34) which are insertable or removable with the carriage or crate (12) and with low-voltage switchgear to control and indicate the operation of the cubicle (20), in which the cubicle (20) has compartments (A1, A2; B1, B2; C, D) divided off from one another for a first busbar (SS1), a second busbar (SS2), a first connector (10), a second connector (10), an output (41) and low-voltage switchgear (D). In addition, there are pressure-relieving devices like flap-valves (e.g. 50, 52) leading out of the compartments reserved for medium-voltage switchgear. According to the invention the compartments (A1, A2; B1, B2; C, D) are fitted in a shared casing (74) forming a circuit compartment (2), where the casing (74) surrounds an encapsulated pressure-relief compartment (E) and the compartments carrying medium voltage equipment are arranged so that they adjoin either the top of the casing or the pressure-relief compartment.

Description

Encapsulated medium-voltage switchgear

TECHNICAL AREA

The invention relates to an encapsulated and partitioned medium-voltage switchgear assembly with a retractable switch carriage or switch insert for optionally connecting an output to one of the two saramel rails of a double busbar system by means of one each on the switch carriage or

Switchgear unit arranged switchgear with plug-in connections that can be extended and retracted when the switching carriage or switchgear is being extended and retracted, as well as with low-voltage equipment for controlling and displaying the operation of the switchgear system, the switchgear system separating rooms from one another

A1) the first busbar of the double busbar system,

A2) the second busbar of the double busbar system,

B1) the first linked to the first busbar

Switchgear; B2) the second switching device linked to the second busbar;

C) the output associated with the two switching devices and

D) for low-voltage equipment, as well as with pressure relief devices such as pressure relief flaps leading out of the medium voltage rooms (A1, A2, B1, B2, C).

STATE OF THE ART

Such encapsulated and partitioned medium-circuit systems are already essentially known. For example, the book "Schaltanlagen" by Bernhard Boehle and others, published by BBC Brown Boveri AG, Mannheim, 8th edition (October 1987) on pages 329 to 336 shows conventional medium-voltage systems of various designs, on page 334 in particular in Fig. 8-25 also an arrangement in which two busbars can optionally be switched to a current outlet and the top of the housing containing this switchgear is equipped with pressure relief flaps. Elsewhere, reports are made about the switching carriage technology, in which the switching devices are essentially arranged on a removable switching carriage.

However, construction details are missing here, and no example is shown in which two double switching carriages are used for a double busbar system.

A brochure from Ritter Starkstromtechnik GmbH & Co., D-4716 Olfen, with the designation GT 3 and the print date April 1989, shows more details in this regard, in which brochure a withdrawable unit with switchgear. (e.g. vacuum circuit breakers) metal-encapsulated, metal-partitioned and air-insulated for voltages between 7.2 and 24 kV and nominal currents up to 3000 A and nominal short-time currents up to 31.5 kA can be described. On page 16 there are switching examples for panels with double busbars, with a) two panels in a wall / wall arrangement

(Double front arrangement) is provided, while under b) an example of the arrangement of two fields back

Back is given.

The fields are each spatially separated from each other, i. that is, one field is required for each of the two busbars. The relatively large amount of space required is a disadvantage.

Of course, the arrangements of the two switch panels standing side by side or back to back can also be accommodated in a common control cabinet and, for example, slide-in technology can be used via separate panels, but the space requirement is then also relatively large. The conventional technology with the necessary additional interlocks to prevent undesired switching states also leads to a greater likelihood of errors in operation and testing.

The object of the invention is to design the medium-voltage switchgear according to the type mentioned at the outset in such a way that greater compactness is achieved without the advantages which can be achieved with switchgear panels set up side by side or back to back for a duplex arrangement being lost.

The object is achieved by the characterizing features of the main claim, that is, in that the six rooms (A1, A2, B1, B2, C, D) are housed in a common housing which forms a control panel, the housing still enclosing an encapsulated pressure relief chamber and the medium voltage rooms (A1, A2, B1, B2, C) so are arranged so that they adjoin either the top of the housing or the pressure relief space.

These features enable switchgear to be constructed which is considerably more compact than was the case in the prior art, without having to compromise on ease of use and without impairing system safety, even when arcing occurs in one or more of the encapsulated rooms .

The advantages that the previous technology has are also present in the embodiment according to the invention.

According to a development of the invention, the two busbar compartments are separated from one another by the exit compartment (C). This increases the safety of the overall arrangement and enables a particularly simple and compact switch carriage or switch insert construction for the switchgear.

For the same reason, it is favorable if the two switchgear or slide-in compartments have a common wall area both with the output compartment and with the associated busbar compartment, because then both slide-in mating contacts can be accommodated in a common candle level, and these connections nevertheless in each case different rooms open, which in turn serves to protect against unwanted flashovers.

The arrangement becomes particularly user-friendly because it can be viewed and operated from one side if the circuit breaker compartments are arranged vertically one above the other.

The pressure relief space will expediently be arranged below the two insertion spaces. This has the advantage that there are particularly short distances for the light arcing hot gases for the rooms

result that do not adjoin the top of the housing. In addition, this arrangement has proven to be particularly favorable in terms of the structural distribution of the individual rooms. Finally, the head and body area of the operating personnel is better protected if the pressure relief space is as low as possible.

A particularly favorable design, because a particularly high mechanical strength can be achieved, is one

Arrangement in which the insertion spaces and the pressure relief space have vertical boundary walls aligned with one another and the wall plane facing the exit space also forms a wall of the busbar spaces.

It is compact if the low-voltage room extends into the exit room. This means that otherwise unused space in the exit room can be used cheaply as a "low-voltage niche".

For the purpose of combining several switch panels into one large switchgear, it is advantageous if the switch panel is a sheet metal housing with essentially flat cover, bottom, front, rear and side walls and the rear (switchgear side) has two lockable and locked doors have a door for the connection compartment and a door for the low-voltage compartment for the plug-in compartments and the front (operating side). Operating and switching devices on different, opposite sides here has certain safety-related advantages.

The switch panels according to the invention allow the arrangement of several such switch panels to form a switchgear assembly in which the individual pressure relief spaces

are aligned and adjacent to each other so that there is a relatively large-volume total pressure relief space, which absorb the gases occurring in one room and then through those in the side

To be able to derive system end walls integrated discharge channels upwards. In the case of higher breaking capacities and / or other structural conditions in the electrical operating room, additional relief channels can be arranged between two adjacent switch panels. These relief channels have upward opening Druckentlastungseinrich lines, such as pressure relief flaps, similar to the way it can be the case in medium voltage rooms, which is on the cover side of the housing

adjoin.

The arrangement according to the invention of the pressure relief space of the individual switch panels, which can be combined to form a common pressure relief space if several

Switch panels are placed side by side, allows relatively good accessibility from the switchgear side, so that if necessary, flaps opened by an arc can be replaced in a simple manner.

BRIEF DESCRIPTION OF THE INVENTION

The invention is described below with reference to exemplary embodiments which are illustrated in the drawings.

It shows:

1 shows a schematic section through a switch panel for a single busbar to explain the essential parts of such a switch panel and the associated rooms which are isolated from one another;

Fig. 2 in a similar representation as Fig. 1

Embodiment for an inventive built control panel;

Fig. 3 is a view from the left of the panel according to

Fig. 2 (operating side);

Fig. 4 is a right view of the panel according to

Fig. 2 (switching device side);

FIG. 5 shows the schematic representation of the partitioning according to FIG. 2;

Fig. 6 one consisting of several Schaitfeiders

Switchgear using control panels according to FIG 5 and laterally arranged pressure relief rooms. and

Fig. 7 in a view similar to Fig. 6 a

Switchgear from several switch panels, whereby pressure relief rooms are also used between individual switch panels.

BEST WAYS OF CARRYING OUT THE INVENTION

In Fig. 1 an encapsulated medium-voltage switchgear 20 can be seen with a retractable switching carriage or switch module 12, with which a cable 16 connected to an output with a phase of a z. B. three-phase busbar 3 can be connected. The illustration in FIG. 1 shows the three phases of the busbar, since these run transversely to the plane of the drawing, while the remaining parts are shown only once, although they are also present in triplicate (offset from the drawing plane). The switch carriage or insert 12 is slidably mounted on wheels 22 on guide rails 24 and can be moved out of the position shown in solid lines into the position shown in broken lines by means of a hand crank 26. With this So-called pull-in contact arrangements 9 with their pins 28 and 30 come out of corresponding plug sockets 32, 34 and thereby separate the switching device (here a vacuum circuit breaker) 10 with its two contact connections on the one hand from the busbar 3 and on the other hand from the output cable 16. The circuit breaker 10 is arranged with its contact drive and with the vacuum-enclosed contacts 36 in a circuit breaker room B which is isolated from other rooms within the switch panel. The partitioning takes place by means of partition walls 40, which can consist of sheet steel or also of plastic plates produced in fire-resistant sandwich construction. These walls are only perforated to lead connecting cables through tulip-like bushings, see e.g. B. the two components 32, 34 already mentioned. In the slide-in or switch carriage disconnection position, the contacts in the tulip bushings are automatically covered with sheets 31 (shutters).

Another compartment is the busbar space A, through which the three phases of the medium-voltage busbars 3 are passed. The third partitioned room is formed by room C, in which a

Current converter 4, a voltage converter 6 and an earthing switch 5 are located, as well as the connection from the circuit breaker 10 via the tulip 34 connection and also the connecting cable 41 leading downwards. The current converter 4 serves to convert the current flowing through the arrangement into a device for the measuring devices and / or protective devices to convert suitable current, the voltage converter 6 similarly generates a secondary voltage. Both measurement signals are led through metal-encapsulated channels via suitable lines in the low-voltage room D, in which one

Control, signaling, protective and measuring equipment is located. Current and voltage can be displayed there, as well as a tax signal for example for actuating the vacuum circuit breaker 10 are generated.

It should be added that a shift lever 42 or

The earthing switch 5 can be actuated via a suitable power drive. In addition, the cable plug 15 allows a voltage tester 14 to be inserted through an opening in the front wall and thus to check the voltage independently of the voltage converter.

Also of importance are the pressure relief flaps 1 provided on the upper side, which, in the event of arcing faults occurring in the medium-voltage rooms A, B and C, discharge the hot gases that are released in an explosive manner upwards. The pressure relief flaps 1 consist for example of aluminum sheet, while the other parts of the housing are made of sheet steel. The pressure relief flaps thus represent "weaknesses" in terms of material strength, which open upwards to protect the other housing parts and the operating personnel or into duct E if explosive excess pressure should occur inside chambers A, B or C.

The switch panel shown in Fig. 1 is provided for a three-phase busbar, which can be connected accordingly with three discharge cables. If you want to be able to switch from one busbar to another busbar for operational safety reasons, as is practical or even mandatory in many systems, this can be achieved in the construction shown by placing two switch panels according to FIG. 1 back to back, and the output cable running downwards connects in parallel. You can also put two such panels next to each other and feed the busbars from one side, while the output cables are in turn connected to them Exit are connected to each other in phases. However, the required space is doubled. It also becomes difficult to find several of these

Arrange arrangements next to each other because of the unsatisfactory feeding of the busbars. It is also problematic that certain control devices have to be linked to one another so that undesired undefined switching states cannot occur.

In this respect, an embodiment as shown in FIG. 2 in a view similar to that in FIG. 1, that is to say in a side section through the control panel, is more favorable. Here, too, an encapsulated medium-voltage switchgear 20 is provided, again with removable switching carriages or plug-in units 12, which run on rollers 22 on rails 24 or (not shown) on the floor surface on which the field is set up and by means of a crank device 26 or also by motor the position shown, in which the plug contact pins 28, 30 are inserted into the corresponding plug contact socket 32, 34 and thus the

Vacuum circuit breaker 10 is in use, can be moved out into a position in which (can be checked from the outside via a window 35) the

Vacuum circuit breaker 10 becomes voltage-free. The construction is designed in such a way that the disconnected position is reached, see dashed line 43, without the access door 37 to room B1 already being able to be opened. As can be seen, the circuit breaker 10 of the circuit breaker room B1 (three such switches are arranged next to one another in the room B1, only one is shown) via the feedthroughs 32 with corresponding three phases L1, L2 and L3 of a first one

Busbar SS 1 connected, which is guided across the field 20 and is located in a first busbar space A1. A second busbar compartment A2 with similar ones Dimensions can be seen at the lower end of the illustration, adjacent to a second circuit breaker room B2, where there are correspondingly three further circuit breakers for the three phases of the second busbar SS 2. Otherwise, the structure is very similar to that already

Structures described with regard to the first busbar SS 1. As with the prior art, the rooms for the circuit breaker (B1, B2) and the rooms for the busbars (A1, A2) are therefore duplicated. The space savings result from the fact that the space for the output (C) and also for the low-voltage equipment (D) is only required in accordance with the invention. The two output connections of the vacuum circuit breakers 10 each open in the output space C, see tulip feedthrough 34. The connections emerging from the tulips 34 are connected in parallel with a rectangular copper conductor 44 and jointly lead via a further rectangular copper conductor 46 to the current transformer 4, from where a further copper conductor 48 leads to a voltage converter 6, which can also include an earthing switch 5. From there, a connection to the connecting cable 41 (also in triplicate) is made, which is led out of the control panel 20 downwards and z. B. continues as an underground cable. Here, too, the medium voltage rooms (A1, A2, B1, B2, C) are each provided with pressure relief devices; in the embodiment shown, the pressure relief flaps 50, 52 leading to the outside with respect to the rooms B1 and A1 and further pressure relief flaps 54, 56 are provided of spaces B2 and A2 and pressure relief flap 58 with respect to the exit space C. The last-mentioned three pressure relief flaps 54, 56, 58 open into a pressure relief space E, which is designed as a channel 60 running transversely to the plane of the drawing and from the drive side (FIG. 4) by unscrewing one corresponding plate 62 is accessible, for example, for the purpose of pressure relief deformed by an arc effect fold 54, 56 or 58 to reinsert or replace. As can be seen, the room C is not secured by a pressure relief flap opening towards the operating side (FIG. 3), but rather by the flap 58 opening into the room E, for the safety of persons who are on the operating side

could. For the same reason, there is also no ventilation flap on the switching device side (FIG. 4), because operating personnel could also be there while an arcing fault occurs.

In order to increase the volume and to relieve pressure upwards from this pressure relief space E, which means greater security against damage, a switch panel 20 according to the construction of FIG. 2 is used in accordance with FIG. 6

additional pressure relief space 64 is provided, see also FIG. 4, the one with the pressure relief space E and the

Pressure relief duct 60 is directly connected. The pressure relief chamber 64 is led upwards in a chimney-like manner and in turn has a pressure relief flap 66 at the top. If several switch panels 20 are placed side by side, as is the case in FIG. 6 or 7, these several switch panels together form the pressure relief channel 60. On both end faces of the group of 6 and 7, a corresponding additional pressure relief chamber 64 is then provided, in FIG. 7 a further space 64 can additionally be seen between two fields. An explosive discharge 66, for example in the lower region of the switch panel, therefore leads to a gas flow along this channel 60, see arrows 68 in the direction of the two or three additional ventilation spaces 64 at the ends or in the central region. FIG. 6 shows that explosive gas developments 72 occurring there at the upper end of the housing can escape via the flaps 50, 52, this in the construction according to FIG. 2 or also, schematically, according to FIG. 5. According to FIG six rooms (A1, A2, B1, B2, C, D) housed in a common housing that forms a switch panel, the housing still enclosing the encapsulated pressure relief chamber E and here the rooms containing the medium-voltage devices (A1, A2, B, C) are arranged so that they adjoin either the top of the housing (flaps 50, 52) or the pressure relief chamber (E) (flaps 54, 56, 58).

5 also shows that the two busbar compartments (A1, A2) are each separated from one another by the exit compartment C. The two power switching rooms B1, B2 adjoin both the output room D and the associated busbar rooms A1 and A2, respectively, so they each have a common wall area here, so that the plug contacts 28, 30 to the sockets located in the appropriate room are simple 32, 34 can be aligned. 5 is arranged at the lower end of the two circuit breaker spaces B1, B2 arranged vertically one above the other, so that spaces A1 and B1 open upwards via pressure relief flaps 50, 52, while the pressure relief gases from the other spaces open into a common space Collect space E or channel 60, which contributes in a suitable manner to a pressure reduction or in an otherwise existing outdoor space 65 z. B. above the system (see Fig. 7). This

Embodiment is advantageous if gases occur during the switching operations, which could be harmful and should therefore be fed to a special collecting device 67.

Fig. 7 also shows that all discharge processes lead to gases which open into the pressure relief space E or the channel 60, from where they, for example, in one or two

Dodge laterally or other additional pressure relief spaces 64 arranged in the central area. From there they can then go outside via pressure relief flaps 66 arrive or they are in a suitable way to one

Collection room 67 led where they can be sucked off and made harmless if it should be harmful gases.

It should be added that not only the low-voltage equipment in room D is accessible from the operating side, for example via door 76, but also the output connection room C via the further door 80, which in turn is provided with viewing window 78. The viewing window serves the mechanical position Check the ground contact 5, which can be operated with a spindle in a manner not shown here by hand or by motor with the door 80 still closed.

COMMERCIAL EVALUATION

Medium-voltage systems of the type described can be evaluated commercially in the energy distribution industry.

Reference symbol list for FIG. 1

(Section through a 12 kV, 31.5 kA switch panel with four compartments A, B, C, D)

A busbar compartment

B Circuit breaker room

C Cable connection area

D low-voltage room

1 pressure relief flaps

2 control panel

3 busbars

4 current transformers

5 earthing switches

6 voltage transformers

7 low voltage relay niche

8 control and signaling contacts

9 Entry contact arrangement

10 vacuum circuit breakers

11 shutter

12 slide-in unit with slide-in device

13 Earthing switch drive

14 voltage testers

15 cable plugs

16 cable end closure

Claims

P a t e n t a n s r u e h e:

Encapsulated and partitioned medium-voltage switchgear (20) with a retractable switch carriage or switch insert (12) for the optional connection of an output to one of the two busbars (3) of a double busbar system by means of a switchgear (10) arranged on the switch carriage or switch insert (12) with the entry and exit Extending a switch carriage or switch insert (12), retractable and extendable plug connections (28, 30; 32, 34), as well as with low-voltage equipment for controlling and displaying the operation of the switchgear (20), the switchgear (20) separating rooms (A1, A2; B1, B2; C, D) for

A1) a first busbar (SS1);

A2) a second busbar (SS2);

B1) a first switching device (10);

B2) a second switching device (10);

C) an output (41); D) has low-voltage equipment,

as well as with pressure relief devices such as flaps (e.g. 50, 52) leading out of the medium voltage rooms (A1, A2; B1, B2; C), characterized in that the rooms (A1, A2, B1, B2, C , D) are accommodated in a common housing (74) forming a switch panel (2), the housing (74) also enclosing an encapsulated pressure-relief chamber (E) and the medium-voltage-carrying rooms (A1, A2; B1, B2; C) are arranged so that they adjoin either the top of the housing or the pressure relief chamber (E).

2. Encapsulated medium voltage switch system (20) after

Claim 1, characterized in that the two busbar compartments (A1 and A2) are separated from one another by the exit compartment (C).

3. Encapsulated medium-voltage switchgear (20) according to claim 1 or 2, characterized in that the two switchgear compartments (plug-in compartments) (B1, B2) both with the output compartment (C) and with the associated busbar compartment (A1 or A2) a common Show wall area.

4. Encapsulated medium-voltage switchgear (20) according to claim 1, 2 or 3, characterized in that the switchgear compartments (plug-in compartments) (B1 or B2) are arranged vertically one above the other.

5. Encapsulated medium-voltage switchgear according to claim 1, 2 or 3, characterized in that the pressure relief space is arranged below the two vertically stacked switchgear compartments (plug-in compartments) (B1, B2) (Fig. 5).

6. Encapsulated medium-voltage switchgear according to claim 5, characterized in that the switchgear compartments (slide-in compartments) (B1, B2) and the pressure relief chamber (E) have mutually aligned vertical boundary walls and the wall plane facing the exit compartment (C) also has one wall of the busbar cavity (A1 ; A2) forms.

7. Encapsulated medium-voltage switchgear according to one of claims 1 to 6, characterized in that the low-voltage space (D) extends into the output space (C).

8. Encapsulated medium-voltage switchgear according to one of claims 1 to 7, characterized in that the control panel (2) is a sheet metal housing (74) with essentially flat cover, bottom, front, rear and side walls that the rear (switchgear side) two lockable and locked doors (37) for the switchgear compartments (slide-in compartments) (B1, B2) and the front wall (front) (operating side) have a door for the connection compartment (80) and a door for the low-voltage compartment (76).

9. Encapsulated medium-voltage switchgear, consisting of several switchgear panels (2) according to claim 8, wherein their pressure relief spaces (E) adjoin one another in an aligned manner, characterized in that a further pressure relief space (64) is provided on one or both remaining side walls, which is connected to the pressure relief space (64). E) the switch panels (C2) are connected and in the event of a fault discharges the hot gases upwards.

10. Encapsulated medium voltage switchgear according to claim 9, characterized in that between two switching Feidern (2) or between two groups of two or more than two panels (2) is an additional pressure relief chamber (64) opening upwards.