CN101507069A - Connection module with an encapsulating housing - Google Patents

Abstract

A connection module (1, 1a, 1b, 1c) has an encapsulating housing (2, 2a). The encapsulating housing (2, 2a) is provided with a first and a second connecting flange (5, 6), wherein an electrical line can be inserted into the interior of the encapsulating housing (2, 2a) via the first connecting flange (5). The second connecting flange (6) is used for connecting the encapsulating housing (2, 2a) to an electrical switching device. The encapsulating housing (2, 2a) has a projecting shoulder (17) on an encapsulating housing inner wall. A measurement transducer (20) is supported on the projecting shoulder (17). Furthermore, the projecting shoulder (17) is used for supporting an insulator arrangement (15).

Description

Connection module with encapsulation housing

technical field

The invention relates to a connection module with an encapsulation housing with a first connection flange for the introduction of electrical conductors and with a second connection for the connection of an electrical switching device, in particular a high-voltage circuit breaker flange.

Background technique

A connection unit of this type is known, for example, from the German utility model DE29902208U1. Therein, a polyphase encapsulated exposed high-voltage circuit breaker with electrical switching devices is described, which has a connection module with an encapsulation housing. For the introduction of electrical conductors, the connection module has a first connection flange. For connecting the switching device, a second connection flange is provided on the connection module with the encapsulation housing.

The electrical switching device therein has a multi-section housing with shortened housing sections in the direction of the connection module. Due to this construction it is necessary to provide several sealing surfaces between the connection module and the individual housing sections of the circuit breaker.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide a connection module that can reduce the number of sealing surfaces.

According to the invention, this technical problem is solved by a connection module of the type mentioned at the outset, that is, the encapsulation housing has at least one protruding shoulder on the inner wall of the encapsulation housing, on which an instrument transformer (Messwandler) is supported. .

The protruding shoulder on the inner wall of the encapsulation housing provides the possibility of arranging the instrument transformer inside the connection module. The instrument transformer is accessible via the second connection flange, so that it is no longer necessary to separate the housing of the electrical switching device mounted on the second connection flange. This reduces the number of seals used. For assembly purposes or for maintenance purposes, the connection module itself can be detached from the switching device or the electrical conductor and assembly work can be carried out inside the connection module.

It is advantageous here if the connection module is designed in such a way that a plurality of wire assemblies which are electrically insulated from one another are guided inside it. The advantage of this configuration is that the connection module can also be used in polyphase power transmission networks. Usually the connection module is part of a so-called switchboard, which is usually formed from several individual modules, wherein each module has at least one encapsulation housing and the encapsulation housings are connected to each other, for example via connection flanges . The individual modules are, for example, busbar sections, disconnectors, earthing switches, transformer modules, circuit breakers and the like. In the case of connection modules, the switchboard can be connected to electrical conductors, such as cables, overhead conductors or other power transmission devices suitable for transmitting power over long distances. With the aid of electrical switching devices, a disconnection position can be established in the electrical energy transmission network. High-voltage circuit breakers are especially suitable for this. Depending on their design, high-voltage circuit breakers are suitable for breaking both rated currents and fault currents, especially short-circuit currents, multiple times.

Another advantageous configuration provides that the protruding shoulder surrounds a main axis.

A shoulder encircling the main axis, in particular coaxially encircling the shoulder, enables the instrument transformer to be oriented to a corresponding predetermined angular position within the encapsulating housing. Furthermore, the annular shoulder enables the transmission of occurring forces along the relatively large contact line between the shoulder and the encapsulation housing. As a result, for example in the event of a short circuit, a magnetic force that occurs stepwise can be transmitted in an improved manner into the encapsulation housing. Surrounds can be constructed piece by piece. It is especially advantageous if the shoulder runs closed. Furthermore, when the annular shoulder is provided, the shoulder can be used to stiffen the encapsulating housing. The annular shoulder acts in the form of a rib which, on the one hand, reinforces the encapsulation housing and, on the other hand, serves as a holding device for the instrument transformer.

Instrument transformers can be used, for example, to transform and reflect currents flowing through conductor sections arranged inside the encapsulating housing. However, it can also be provided that the instrument transformer is used to determine and transform the voltage applied to the electrical line section. It can be provided here that the instrument transformer is used to determine the electrical quantities of a single phase of a multiphase system, or that the instrument transformer is used to determine the electrical quantities of several phases of a multiphase system.

The annular shoulder can be designed in the form of a ring, wherein the instrument transformer rests on at least one annular surface. However, it is also possible to form the annular shoulder in the form of a disk and to provide a plurality of recesses on this disk, so that the annular shoulder is formed on the inner wall of the encapsulating housing.

A further advantageous configuration can be such that the shoulder is connected in a materially bonded manner to the encapsulating housing wall.

The cohesive connection can be realized, for example, by welding or soldering projecting shoulders in the encapsulation housing. Since the encapsulation, especially in the medium-voltage and high-voltage area, is also designed as a gas-tight encapsulation, the encapsulation must have sufficient mechanical strength when designing the overpressure inside the encapsulation. This is usually achieved by using metallic materials for the encapsulation housing. The metal material can be formed in a simple manner and can also be provided with a protruding shoulder in a materially bonded manner by means of a corresponding connection method (welding, soldering, etc.).

However, it can also be provided that the protruding shoulder is formed on the encapsulation housing, for example within the scope of the production process of the encapsulation housing by a casting process. As a result, a plurality of encapsulation housings according to the invention can be efficiently and quickly produced, which can be produced inexpensively while maintaining sufficient quality in mass production.

Furthermore, it can advantageously be provided that the protruding shoulder differs from the collar which is designed for connecting other elements.

The protruding shoulder can form a stop point for the instrument transformer at a relatively large distance from the opening of the encapsulation housing. In the case of the switchboards mentioned at the outset having a plurality of encapsulation housings which are each connected to one another by means of flanges, the flanges are often also used for holding and positioning additional components in addition to the connecting function. During assembly, the components to be positioned accordingly are taken into account for this. This requires complex assembly methods.

By means of a separately designed protruding shoulder which is arranged at a distance from the flange, the instrument transformer can already be arranged inside the connection module, for example during the modular pre-production of the connection module. In this case, when the connection module is connected, for example, to the housing of a circuit breaker, the positioning of the instrument transformer need not be taken into consideration since the instrument transformer already assumes its final position within the connection module relative to the housing.

Another advantageous configuration provides that one connecting flange is oriented in the direction of the main axis, while the other connecting flange is oriented substantially transversely to the main axis.

When using a flange with an annular flange surface, it can advantageously be configured such that the axis extending through the center point of the annular flange surface is oriented such that the annularly extending flange is coaxial with this axis. orientation. This axis is, for example, the main axis of the encapsulation housing.

The connecting flange is often equipped with a circular flange surface. Said flange surface is adapted to a corresponding tubular flange socket, which is oriented coaxially to an axis extending through the center point of the annular flange surface. The flange face and the flange adapter form a flange. In this case, it can advantageously be provided that the flange axis defined in this way extends in the direction of the main axis. It is particularly advantageous if the flange axis is aligned coaxially to the main axis. Correspondingly, the flange axis of the other connecting flange can be oriented transversely to the main axis, wherein an intersection point is formed at the main axis of the other flange with the flange axis, so that the flange axis extends radially of the main axis . Here, it is advantageous to form an angle of 90° between the flange axes of the two connecting flanges. As a result, the connection module can advantageously be used, for example, in switchboards which are installed in buildings and where only limited space exists. Thus, electrical conductors can be introduced into the connection module from a substantially vertical position and passed inside the connection module deflected by 90°, so that the connection piece passes through the second connection flange for connecting the electrical switching device, said connection piece substantially oriented horizontally. Furthermore, this angular position affords the possibility that the encapsulation housing of the connection module can be provided with further flanges which, if required, cooperate with other components.

A further advantageous embodiment can be provided that an insulator arrangement is supported on the protruding shoulder.

In addition to the use of the protruding shoulders for supporting the instrument transformer, the protruding shoulders can advantageously be used as supports for the insulator arrangement. The installation space available inside the encapsulation housing is thus used in an improved manner. Therefore, additional attachments and support means, which would otherwise be provided separately for the insulator arrangement, are no longer necessary.

An advantageous embodiment can furthermore be designed such that the instrument transformer and the insulator arrangement are each supported on opposite sides of the protruding shoulders.

By arranging the instrument transformer and the insulator arrangement on two sides facing away from each other, the insulator arrangement and the instrument transformer can be assembled independently of each other on the protruding shoulder. This makes it possible to assemble these components independently of one another and to disassemble them independently of one another. Furthermore, it is possible to fasten the instrument transformer only on the projecting shoulder or only the insulator arrangement. As a result, the connection modules can be used in a variety of ways.

Another advantageous embodiment can provide that the insulator arrangement has disk insulators.

A disk insulator is an insulator which has a flat extension through which an electrical conductor to be fastened passes, wherein the electrical conductor is surrounded essentially disk-shaped transversely to its longitudinal axis by an insulating material. Disk insulators of this type can be held, for example, in the manner of insulating bushings for electrical conductors. It is particularly advantageous here that the disc insulator is sealed or supported on the protruding shoulder, so that the difficult-to-form insulating material block is strong compared to the housing material. For this purpose it can be provided that the disk insulator is additionally surrounded by a carrier attachment, to which the disk insulator is connected and which contacts the protruding shoulder. Here, the disc insulators can be designed as single-phase disc insulators or multi-phase disc insulators. In multiphase disc insulators, a plurality of electrical conductors are fixed electrically insulated from one another by means of one or more disc insulators. When using several disk insulators, the annular shoulder can be formed, for example, by a plate, wherein the plate has a plurality of recesses, each of which is associated with a disk insulator. The insulator arrangement thus formed is supported on the protruding shoulders.

Another advantageous configuration can be provided that the insulating device bears against the protruding shoulder in a gas-tight manner.

The gas-tight transition to the protruding shoulder provides the possibility of installing the disc insulator itself as a barrier in the interior of the encapsulation housing. The barrier is here a gas-tight barrier, so that no gas exchange can take place via the insulation. As a result, the area of the encapsulation housing in which the instrument transformer is arranged can be separated from other areas of the encapsulation housing. Thus, for example, instrument transformers can be protected against electric arcs. Arcing can occur, for example, in the event of a fault inside the encapsulation housing.

However, it can also be provided that the insulator arrangement has grooves through which the insulating gas can flow.

Another advantageous embodiment can be provided that the encapsulation housing at least partially surrounds a disconnector.

Furthermore, it can likewise be provided that the encapsulation housing at least partially surrounds an earthing switch.

Each conductor segment inside the connection module can be disconnected from other conductor segments by means of a disconnect switch or a grounding switch. Thus, for example, the electrically conductive connection between the conductor leading into the connection module and the electrical switch can be disconnected by means of a disconnect switch. With the aid of the grounding switch, the conductor segments inside the encapsulation housing which are designed to carry electrical power can be acted upon at ground potential. This is required, for example, for security reasons.

During the switching process of the earthing switch or the disconnecting switch, although switching devices of this type are switched without power, discharge phenomena can also occur during the switching process. It is advantageous here if the space available inside the encapsulation housing is allocated by means of the insulator arrangement, so that the electrical switching device arranged at least partially inside the encapsulation housing is separated from the instrument transformer. As a result, the instrument transformer is protected from arcing. Furthermore, decomposition effects, which occur when the arc is generated, are observed with the use of high-pressure sulfur hexafluoride. Decomposition products formed here can damage the instrument transformer. Therefore, it is advantageous to separate the instrument transformer from other components inside the encapsulating housing by means of an insulator arrangement.

Description of drawings

Embodiments of the invention are shown schematically in the drawings and described in detail below.

In the picture:

Fig. 1 is a cross-sectional view of a connection module of a first embodiment variant,

Fig. 2 is a cross-sectional view of a connection module of a second embodiment variant,

Fig. 3 is a cross-sectional view of a connection module of a third embodiment variant,

4 is a cross-sectional view of a connection module of a fourth embodiment variant, and

Fig. 5 is a cross-sectional view of a connection module of a fifth embodiment modification.

Detailed ways

The basic structure of the connection module according to the invention will be explained below on the basis of the first embodiment variant of the connection module shown in FIG. 1 . The design variants shown in FIGS. 2 , 3 , 4 , and 5 are each a transformation of the design variant shown in FIG. 1 . They differ essentially in that, in various embodiments, additional components are arranged on the encapsulating housing.

Corresponding reference numerals will be assigned in the course of the description of FIG. 1 , wherein these reference numerals are also used for identically acting components in FIGS. 2 to 5 .

FIG. 1 shows a sectional view of a first embodiment variant of a connection module 1 . The first connection module 1 has an encapsulation housing 2 . The walls of the encapsulation housing 2 are substantially formed from a metallic material, for example from an aluminum alloy or a steel alloy. Advantageously, the encapsulation housing 2 is produced by means of a casting method.

The encapsulation housing 2 is designed to be gas-tight. In the assembled state, its interior is filled with an insulating gas, such as SF ₆ . The insulating gas preferably has an overpressure.

The encapsulation housing 2 has a main axis 3 . An encapsulation housing 2 having a substantially hollow cylindrical structure extends around a main axis 3 . The transverse axis 4 is arranged radially of the main axis 3 . The transverse axis 4 intersects the main axis 3 at right angles.

On the housing side, the encapsulation housing 2 has a first connecting flange 5 coaxial to the transverse axis 4 . The encapsulation housing 2 has a second connecting flange 6 coaxial to the main axis 3 on the end side. Both the first and the second connecting flange 5 , 6 are designed as annular connecting flanges, so that the annular flange surfaces lie in a plane in which the main axis 3 or the transverse axis 4 respectively lie perpendicularly.

Furthermore, a third connecting flange 7 and a fourth connecting flange 8 are provided. The third connecting flange 7 is oriented coaxially to the main axis 3 and is arranged on the encapsulation housing 2 at the end opposite the second connecting flange 6 . The third connecting flange 8 is arranged coaxially to the transverse axis 4 and is arranged on the encapsulating housing 2 on the housing side just diametrically opposite the first connecting flange 5 . The third and fourth connection flanges 7 , 8 are each closed gas-tight by a blind cap 9 a , 9 b. In the embodiments shown in FIGS. 2 to 5 , the third and fourth connecting flanges 7 , 8 are each partially shown in alternative configurations and are partially directed at different axial positions.

Furthermore, it is not necessarily necessary that the first connecting flange 5 and the fourth connecting flange 8 as well as the second connecting flange 6 and the third connecting flange 7 are each aligned coaxially with respect to one another. It is also possible to arrange the connection flanges in each case offset relative to one another.

The first connection flange 5 is closed by a sleeve arrangement 10 . The bushing arrangement 10 has a plurality of bushings in order to guide a plurality of cable bundles through the encapsulation housing 2 into the interior of the encapsulation housing. In the present case three bushings are provided, which are distributed evenly over the bushing arrangement, advantageously arranged on the so-called vertices of an equilateral triangle. Inside the encapsulation housing 2 , a plurality of differently shaped contact pieces 11 are arranged, on which the cable bundles are each contacted. The connection modules are designed as 3-phase modules. The contact piece 11 supports a fixed counter-contact piece 12 which belongs to a disconnector 13 . The disconnector 13 is equipped with a movable contact piece which can be moved into the mating contact piece 12 if necessary. As is known in principle, for example, from DE 29806211 U1 or EP 1082791 B1, the movable contact piece is attached to the disconnector-grounding combination 14 . The disconnector-grounding combination 14 has a plurality of conductor segments arranged electrically insulated from one another, which are arranged one behind the other in the direction of the drawing plane of FIG. 1 in an electrically insulated manner. The disconnect switch-ground combination 14 is held on an insulator arrangement 15 . Furthermore, the switch-disconnector-ground combination 14 has a movable ground contact which, if necessary, connects the conductor sections of the disconnector-ground combination 14 to ground potential. In the present case, the ground potential is formed by the encapsulation housing 2 with a stationary ground counter-contact 16 which is respectively arranged on the encapsulation housing and makes electrical contact therewith.

The protruding shoulder 7 is arranged coaxially to the main axis 3 and bonded to the inner wall of the encapsulating housing. In the present embodiment, the protruding shoulder 17 is formed in the form of a circumferential flat ring and is molded onto the material-bonded encapsulation housing 2 by means of a casting method. On the side of the projecting shoulder 17 facing the disconnector-earth combination 14 , the insulator arrangement 15 is supported on the projecting shoulder 17 . For this purpose, screwing or clamping of the insulator arrangement 15 takes place, for example. It is advantageous for the insulator arrangement 15 to be hermetically sealed against the protruding shoulder 17 . In the present embodiment, the insulator arrangement 15 has a disk-shaped insulator 18 which holds a plurality of connecting elements 19 . The connection piece 19 has a substantially cylindrical elongated contour, which passes through the disc insulator 18 and conducts electricity with a corresponding contact point of the disconnector-earth combination 14 on the side facing the disconnector-earth combination 14 connect. On the side of the disk insulator 18 facing away from the switch-ground combination 14 , the connecting piece 19 is oriented approximately parallel to the main axis 3 . Here, the axes of the three connecting elements (one not visible) 19 are preferably arranged in a triangle relative to one another. The instrument transformer 20 is arranged around the connection piece 19 . In the present embodiment, the instrument transformer 20 is a current transformer, which has a measuring circuit which respectively surrounds the connection pieces 19 . The measuring circuit can be, for example, an electrical winding, which is subjected to a current flowing inside the connecting piece 19 according to the transformer principle. Information about the transformed current can be captured via a corresponding measuring connection 21 and processed further.

A gas-tight barrier is formed within the encapsulation housing 2 by the insulator arrangement 15 and its gas-tight bearing on the protruding shoulder 17 . This separates the first area in which the electrical switching device is located and the second area in which the instrument transformer 20 is located. As a result, the first region can be filled with insulating gas, and the connection module prefilled in this way can be used for assembly. In contrast, the instrument transformer 20 is arranged in a second cavity which is freely accessible via the second connection flange 6 . Thus, the second region is connected to the housing of the electrical circuit breaker with at least a part of the cavity of the housing of the electrical circuit breaker by means of a flange connection after the assembly of the second connecting flange 6, said flange connection having a second Connect flange 6. The second region is part of the gas cavity made up of a plurality of encapsulation shells.

Next, a second structural variant of the connection module 1 a shown in FIG. 2 will be described. Here, differences from the structure shown in FIG. 1 will be described. Components already disclosed and illustrated by FIG. 1 are not described separately.

In the second design variant of the connection module 1 a shown in FIG. 2 , other components are provided on the third and fourth connection flanges 7 , 8 instead of the blinds. A grounding switch 23 is flanged to the third connection flange 7 , via which the specially shaped contact piece 11 can be acted upon with ground potential. Furthermore, a further instrument transformer 22 is arranged on the fourth connection flange 8 . The further instrument transformer 22 is a voltage transformer, wherein the voltage transformer 22 is in contact with the specially shaped contact piece 11 via a corresponding conductive connection. It is thus possible to detect potentials with specially shaped contacts 11 . The state of the electrical conductor introduced through the bushing arrangement 10 can thus be monitored by means of the potential transformer 22 . Therefore, application or non-application of voltage can be detected.

The grounding switch 23 mounted on the third connection flange can be designed, for example, as a quick grounding device, so that it can quickly bring the specially shaped contact piece 11 into contact with ground potential in the event of a fault. At this time, the various contacts 11 are short-circuited and ground potential is applied.

FIG. 3 shows an alternative configuration of the switching device disclosed by FIG. 2 . The third and fourth connection flanges 7, 8 are now constructed and their diameters are dimensioned in such a way that the potential transformer 22a and the grounding switch 23a can pass almost completely through the third and fourth connection flanges 7, 8, In this case, the sockets of the third and fourth connection flanges 7 , 8 are dimensioned such that they surround the voltage transformer 22 a and the grounding switch 23 a. This gives the possibility that the third and fourth flanges 7, 8 are each closed with a flat flange cover, wherein the earthing switch 23a and the potential transformer 22a are fixed on the respective flat flange cover, and The voltage transformer 22a and earthing switch 23a are removed by removing the flange cover.

4 and 5 show further developments of the design variants of the encapsulation housing shown in FIG. 3 . The encapsulating housing 2 a is designed in such a way that, in the assembly position shown in the figures, the positions of the first and fourth connection flanges 5 , 8 are exchanged. Thus, the electrical conductor is now fed through the bushing arrangement 10 , which is arranged above the main axis 3 relative to the measuring connection 21 . However, in the embodiment of the connection module shown in FIG. 4, which is also used for leading cables in the design variants shown in FIGS. 1, 2 and 3, the bushing device 10 is shown in FIG. 5 as A variant of the bushing arrangement 10a for the introduction of overhead lines through bushings 24 in the open air.

In the embodiment variant shown in FIG. 4 , the electrical conductors introduced into the encapsulation housing 2 a are introduced from above the connection module 1 b. This type of arrangement can be advantageous, for example, when isolating switchboards in building basements. However, it is also possible, as shown in FIG. 5 , to provide a variant of the bushing arrangement 10 a such that the weather bushing is supported in a position-fixed manner on a variant of the bushing arrangement 10 . For example, the contact piece 11 of the connection module 1c can be brought into contact with the overhead line through the open-air bushing 24 when the connection module 1c is placed in the open air.

Claims (11)

1. A connection module (1, 1a, 1b, 1c) with an encapsulation housing (2, 2a), the encapsulation housing has a first connection flange (5) for introducing an electrical conductor, and has a A second connection flange (6) for connecting an electrical switching device, especially a high-voltage circuit breaker, characterized in that the encapsulation housing (2, 2a) has at least one protruding shoulder (17) on the inner wall of the encapsulation housing ), an instrument transformer (20) is supported on the shoulder. 2. Connection module (1, 1a, 1b, 1c) according to claim 1, characterized in that the protruding shoulder (17) encircles the main axis (3). 3. The connection module (1, 1a, 1b, 1c) according to claim 1 or 2, characterized in that the shoulder (17) is materially connected to the inner wall of the encapsulating housing. 4. Connection module (1, 1a, 1b, 1c) according to any one of claims 1 to 3, characterized in that the protruding shoulder (17) is connected to a The flanges (5, 6, 7, 8) are different. 5. The connection module (1, 1a, 1b, 1c) according to any one of claims 2 to 4, characterized in that one of the flanges (6) in the direction of the main axis (3) oriented upwards, while the other flange (5) is oriented substantially transversely to said main axis (3). 6. Connection module (1, 1a, 1b, 1c) according to any one of claims 1 to 5, characterized in that an insulator arrangement (15) is supported on the protruding shoulder (17) . 7. The connection module (1, 1a, 1b, 1c) according to claim 6, characterized in that, the instrument transformer (20) and the insulator device (15) are respectively supported on the protruding convex On the two sides facing away from each other of the shoulder (17). 8. Connection module (1, 1a, 1b, 1c) according to claim 6 or 7, characterized in that the insulator arrangement (15) has a disc-shaped insulator (18). 9. The connection module (1, 1a, 1b, 1c) according to any one of claims 6 to 8, characterized in that the insulator arrangement (15) rests gas-tight on the protruding boss on the shoulder (17). 10. The connection module (1, 1a, 1b, 1c) according to any one of claims 1 to 9, characterized in that the encapsulation housing (2, 2a) at least partially encloses a disconnector ( 13). 11. The connection module (1, 1a, 1b, 1c) according to any one of claims 1 to 10, characterized in that the encapsulating housing (2, 2a) at least partially encloses a grounding switch ( 14, 23, 23a).

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