EP1825488B1 - Polyphase switching device comprising at least three similar interrupter units - Google Patents

Description

The invention relates to a multi-phase switching device with at least three similar interrupter units, each having a first and a second connector, each lying on a main axis, wherein the major axes are aligned approximately parallel to each other.

Such a multi-phase switching device is for example from the patent US 6,630,638 B1 known. The local multiphase switching device has three interrupter units, which are each surrounded by a separate encapsulating. For connecting the breaker units to an electric power transmission network, outdoor bushings for introducing electrical conductors are respectively arranged on the encapsulating housings.

Another example is in US-A-5128502 disclosed.

The encapsulating and thus also located inside the interrupter units of the known multi-phase switching device are close together. In order to ensure a necessary spacing of air-insulated electrical conductors at the free ends of the outdoor bushings, they are each pulled apart like a fan. Due to the compact arrangement of the interrupter units to each other a small footprint for the electrical switching device is needed. However, the retrofitting or expansion of the known multi-phase switching device with other modules, such as earthing switches or circuit breakers, is hardly possible due to the tight space.

The invention has for its object to provide a multi-phase switching device, which is flexible and reserves sufficient reserves for the introduction of other modules.

The object is achieved in a multi-phase switching device of the type mentioned in the present invention, that all distances of the major axes have different amounts from each other.

By choosing different amounts for the distances of the main axes of the interrupter units to each other, a multi-phase switching device can be designed, which has an asymmetrical distribution of the interrupter units. Due to the asymmetrical distribution different areas are provided on the switching device, which are available for retrofitting of other modules such as earthing switches, voltage or current transformers or the like. The different distances of the main axes to one another make it possible to provide areas of different sizes or volumes on the switching device in order to retrofit components of different sizes, such as switching devices, voltage transformers or other monitoring devices.

The breaker units may for example be designed such that two relatively movable contact pieces are arranged axially opposite one another and one or both contact pieces along the axis are displaceable. At the ends facing away from the switching point of the contact pieces are in each case the connecting pieces of the interrupter unit. In such an embodiment, the main axis of the interrupter unit and the axis along which the relative movement of the contact pieces is approximately identical.

The connecting pieces are then advantageously designed substantially rotationally symmetrical and arranged coaxially with the axis.

Advantageously, it can be provided that the main axes are arranged in a common plane.

With an arrangement of the main axes in a common plane, the switching device can be designed, for example, in a dead tank design. Due to the arrangements in a plane in connection with the choice of the distances of the main axes to each other are between the breaker units of the individual phases areas of different sizes for the installation of different sized elements available.

In this case, it can furthermore be advantageously provided that each of the interrupter units is surrounded by a separate encapsulating housing.

The sheathing of the interrupter units with separate encapsulation housings also makes it possible to variably set the distances of the main axes from one another depending on the site of installation. Each of the encapsulating housings with the respective breaker units acts independently of the others in terms of arc extinction, insulation resistance and so on.

A further advantageous embodiment can provide that at least one outdoor bushing is arranged with an essentially radial orientation to the main axis of the respective encapsulating housing for the electrical connection of the interrupter units.

By means of outdoor bushings electrical lines can be safely inserted into the interior of the encapsulating. The radial alignment allows safe spacing of live parts to the housing. For example, the encapsulating housing can consist of an electrically conductive material and can itself carry ground potential. This results in robust weather-resistant arrangements that can be used for example under difficult climatic conditions.

A further advantageous embodiment can provide that two outdoor bushings are each pivoted about the main axes with opposite sense of direction from a vertical and an outdoor bushing is arranged in the vertical.

Such a configuration may, for example, lead to the design of fan-shaped outdoor bushings of three phases of the switching device arranged in a fan-shaped manner. As a result, a sufficient impact distance at the different electrical potentials leading free ends of the outdoor bushings can be generated in a simple manner.

Furthermore, it can be advantageously provided that all outdoor bushings are pivoted by up to a maximum of 45 ° from a vertical respectively about the main axes, wherein an outdoor bushing is swung out with deviating from the other outdoor bushings sense of direction.

In conjunction with the different distances of the main axes of the breaker units and a pivoting of all outdoor bushings, wherein one of the outdoor bushings swung with a different sense of direction is, the observance of sufficient impact distance between the outdoor bushings is guaranteed. In addition, with an arrangement of the interrupter units in a plane can be achieved that the height of the connection points at the free ends of the outdoor bushings is the same for all phases. This results in advantages in a cramped installation of the electrical switching device, for example, under a high voltage line. Compared with symmetrically fanned outdoor bushings in which the connection point of the centrally arranged passage is higher than the connection points of laterally pivoted outdoor bushings, a use of a switching device according to the invention is also possible on built-up areas of low height.

Furthermore, it can be advantageously provided that the switching device is a single-phase encapsulated switching device in dead-tank design and the switching device is a high-voltage circuit breaker.

Switchgear in dead-tank design are known for example from the prior art. An inventive design of a high-voltage circuit breaker in dead-tank design is compatible with existing arrangements, that is, in a replacement of worn high-voltage circuit breakers can thus easily find an inventive high-voltage circuit breaker use.

It can be advantageously further provided that at least one outdoor bushing is flanged directly to a flange arranged on the encapsulating housing.

By directly flanging an outdoor bushing to the encapsulating a mechanically stable unit is formed. Vibrations of the outdoor bushings due to switching operations or wind loads can be limited to a permissible level.

A further advantageous embodiment can provide that at least one outdoor bushing is flanged indirectly to an encapsulating housing with the interposition of a further housing assembly.

The intermediate construction of another housing assembly makes it possible to attach additional components in a compact form to the multiphase switching device. For this purpose, for example, the interior of the housing assembly can be used.

It can be advantageously provided that in the further housing assembly, a circuit breaker and / or a grounding switch is arranged.

The arrangement of disconnectors or earthing switches within a further housing assembly protects them from external environmental influences. At the same time, the environment is protected from hazards emanating from the switching devices arranged in the interior of the housing assembly.

In addition, with the equipment of the multiphase switching device with a further housing assembly, the number of possible circuit variants is increased. Thus, the multi-phase electrical switching device is versatile. For example, it may be provided that individual overhead line sections are disconnected via the earthing switch and the disconnector, and that these are then earthed.

Figur 1

eine stirnseitige Ansicht eines mehrphasigen Schaltgerätes, die

Figur 2

eine seitliche Ansicht des in der Figur 1 dargestellten mehrphasigen Schaltgerätes, die

Figur 3

eine stirnseitige Ansicht des aus der Figur 1 bekannten Schaltgerätes mit einem Freilufterdungsschalter sowie die

Figur 4

eine seitliche Ansicht eines elektrischen Schaltgerätes mit Freiluftdurchführungen und zwischengebauten weiteren Gehäusebaugruppen.

In the following, an embodiment of the invention is shown schematically in a drawing and described in more detail below. It shows the

FIG. 1

an end view of a multi-phase switching device, the

FIG. 2

a side view of the in the FIG. 1 shown multi-phase switching device, the

FIG. 3

an end view of the from the FIG. 1 known switching device with a Freilufterdungsschalter and the

FIG. 4

a side view of an electrical switching device with outdoor bushings and interposed other housing assemblies.

The FIG. 1 shows a multi-phase switching device 1. The multi-phase switching device has three phases A, B, C. Each of the three phases A, B, C is associated with a separate encapsulating housing 2, 3, 4. The encapsulating housings 2, 3, 4 are each made of an electrically conductive material and surround an interrupter unit of a high-voltage circuit breaker. The encapsulating housings 2, 3, 4 have a substantially tubular structure. Along the tube axes of the encapsulating 2, 3, 4, the respective interrupter units of the phases A, B, C are arranged in the interior of the encapsulating 2, 3, 4. In the FIG. 1 the main axes project vertically out of the plane of the drawing. A main axis 5 of the phase C is in a side view in the FIG. 2 recognizable. The line of sight of the representation of FIG. 2 is in the FIG. 1 indicated by an arrow 6. Is exemplary in the FIG. 2 an interrupter unit 11 is shown. The interrupter unit 11 has a first contact piece 12 and a second contact piece 13. The contact pieces 12, 13 are coaxial with the main axis 5. The first contact piece 12 is tulip-shaped, the second contact piece 13 is designed bolt-shaped. The second contact piece 13 is displaceable via a drive device 14 along the main axis 5. The connecting pieces are substantially rotationally symmetrical and are arranged at the ends of the contact pieces 12, 13 facing away from the switching point.

For supplying the electrical lines to the interrupter units located in the interior of the encapsulating housings 2, 3, 4, a first and a second outdoor bushing 7a, b, c, d are respectively arranged on the encapsulation housings 2, 3, 4 on the jacket side. The main axes of the phases A, B, C are each arranged in a common plane and aligned parallel to each other. All distances of the major axes of the phases A, B, C are different from each other. Thus, the distance between the major axes of the phases A and C is greater than the distance between the major axes of the phases A and B and greater than the distance between the major axes of the phases B and C. Whereby the distance between the major axes of the phases A and B is greater than the distance between the major axes of phases B and C.

In addition to in the FIG. 1 However, it can also be provided that the main axes are arranged parallel to one another, but lie in different planes, so that a so-called triangular arrangement arises. Also in this case, the distance of all major axes is different from each other. Furthermore, it can also be provided that one or more of the outdoor bushings of the phases A, B, C are in a vertical.

In order to ensure a sufficient impact distance S at the free ends of the outdoor bushings, the axes of the outdoor bushings are pivoted out of a vertical. The axes are all deflected by the same amount. The outdoor bushings of phases A and B are each deflected with the same sense of direction. Although the outdoor bushings of phase C are deflected by the same amount but with different sense of direction. This results in an arrangement in which the connection points of the outdoor bushings are at the same height, with approximately equal distances S between the connection points of the outer outdoor bushings and the middle outdoor bushing present.

When in the FIG. 1 illustrated asymmetric distribution of the main axes is formed between the phases A and B, a receiving space for the arrangement of other modules such as earthing switches or the like. Between phase B and C, such a space is not provided. Due to the asymmetrical arrangement, the entire multi-phase switching device is rotatable about a vertical axis, so that the space provided for retrofitting further modules space can be rotated in the desired position.

In the FIG. 3 By way of example, the equipment of the multi-phase switching device shown in FIG. 1 with an open-circuit grounding switch 8 is shown. The Freilufterdungsschalter 8 has at each stage on a pivotable rod which are rotatably mounted near the base of the outdoor bushings 7a, 7b, 7c. There they are also connected to the earth potential. For grounding, the earthing rods in the in the FIG. 3 shown pivoted position upwards be and there in a mating contact at the free end of the respective outdoor bushings 7 a, 7 b, 7 c retract. At the two outer phases A, C, the earthing rods are arranged on the outside. At the middle phase B, the ground bar is arranged in the space obtained by the asymmetrical distribution of the breaker unit. Due to the similar but made with different sense direction swiveling and thus achieved the same height of the connection points of the outdoor bushings similar grounding rods at the outdoor earthing switch 8 can be used for all three phases.

The FIG. 4 shows a further embodiment of a phase of a multi-phase switching device, wherein the outdoor bushings 7e, 7f are flanged with the interposition of a respective further housing assembly 9a, 9b to the encapsulating housing 10. In the interior of the other housing assemblies 9a, 9b, for example, disconnectors or earthing switches can be arranged. By means of the circuit breaker, for example, via the outdoor bushings 7e, 7f introduced into the interior of the encapsulating housing 10 Leiterzug can be separated. By means of the earthing switch, the corresponding conductor can be acted upon with ground potential. Inside the encapsulating housing, the circuit breakers or earthing switches are protected against external environmental influences. Furthermore, standing under high voltage potential outdoor bushings further away from the encapsulating housing 10 are flanged to this indirectly. As a result, a threat to operating personnel is avoided because high-voltage parts are further spaced from this.

Claims (11)

1. Polyphase switching device (1) comprising at least three similar interrupter units (11), which each have a first and a second connection piece, which each lie on a main axis, the main axes being aligned approximately parallel to one another, characterized in that all of the distances between the main axes have different absolute values.
2. Polyphase switching device (1) according to Claim 1, characterized in that the main axes are arranged in a common plane.
3. Polyphase switching device (1) according to either of Claims 1 and 2, characterized in that each of the interrupter units (11) is surrounded by a separate encapsulating housing (2, 3, 4).
4. Polyphase switching device (1) according to Claim 3, characterized in that, in order to electrically connect the interrupter units (11), in each case at least one outdoor bushing (7a, b, c, d) is arranged with a substantially radial alignment with respect to the main axis of the respective encapsulating housing (2, 3, 4).
5. Polyphase switching device (1) according to Claim 4, characterized in that two outdoor bushings (7a, b, c, d) are each pivoted about the main axes with opposite sense of direction out of a perpendicular, and an outdoor bushing is arranged in the perpendicular.
6. Polyphase switching device (1) according to Claim 5, characterized in that all of the outdoor bushings (7a, b, c, d) are pivoted through up to a maximum of 45° out of a perpendicular in each case about the main axes, with one outdoor bushing being pivoted out with a sense of direction which is different from that of the other outdoor bushings (7a, b, c, d).
7. Polyphase switching device (1) according to one of Claims 1 to 6, characterized in that the switching device is a single-phase-encapsulated switching device with a dead tank design and the switching device is a high-voltage circuit breaker.
8. Polyphase switching device (1) according to one of Claims 4 to 7, characterized in that at least one outdoor bushing (7a, b, c, d) is flange-connected directly on a flange arranged on the encapsulating housing (2, 3, 4).
9. Polyphase switching device (1) according to one of Claims 4 to 7, characterized in that at least one outdoor bushing (7a, b, c, d) is flange-connected to an encapsulating housing (10) indirectly, with a further housing assembly (9a, 9b) interposed.
10. Polyphase switching device (1) according to Claim 9, characterized in that a switch disconnector is arranged in the further housing assembly (9a, 9b).
11. Polyphase switching device (1) according to Claim 9 or 10, characterized in that a grounding switch is arranged in the further housing assembly (9a, 9b).

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