CN109643617B

CN109643617B - Contact arm device for high-voltage switchgear and use thereof

Info

Publication number: CN109643617B
Application number: CN201780047869.3A
Authority: CN
Inventors: M.赫尼基; M.罗曼; B.拉思; D.施拉德
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2016-08-03
Filing date: 2017-07-06
Publication date: 2020-09-25
Anticipated expiration: 2037-07-06
Also published as: EP3469613A1; CN109643617A; DE102016214377B4; EP3469613B1; PL3469613T3; WO2018024437A1; BR112019001279A2; DE102016214377A1

Abstract

The invention relates to a contact arm arrangement (2) for a high-voltage switching device (1), comprising at least two contact arms (7) which are arranged in pairs and are movable relative to one another by means of at least one hinge (10) and each comprise an upper contact arm part (8) and a lower contact arm part (9). The upper parts (8) of the contact arms each have at least one recess designed to receive a contact element (17). The contact arm arrangement (2) can be used according to the invention in a high-voltage switchgear assembly (1) in the form of a pantograph.

Description

Contact arm device for high-voltage switchgear and use thereof

The invention relates to a contact arm arrangement for a high-voltage switching device and to the use thereof, wherein the contact arm arrangement has at least two contact arms which are arranged in pairs and are movable relative to one another by means of at least one hinge and each comprise an upper contact arm part and a lower contact arm part.

High-voltage switchgear is used in the high-voltage range, i.e. above 1000V. The high-voltage switchgear is, for example, a disconnector, in particular a single-pole disconnector for visibly interrupting a current path, or an earthing switch. The high-voltage switchgear can be constructed in the form of a pantograph. Typical constructions here comprise at least one contact point (or contact) with a movable and a fixed contact piece. The stationary contact piece, i.e. the stationary contact, is, for example, a spatially stationary cylindrical metal tube or cable. The contact piece is made of a material which conducts current well, such as copper, and/or is made of aluminum in order to achieve a high mechanical strength.

The movable contact piece comprises, for example, a contact arm arrangement having at least two contact arms which are arranged in pairs and are movable relative to one another by means of at least one hinge, similar to a pantograph. The contact arms include upper contact arm portions and lower contact arm portions, respectively. When the fixed contact pieces are electrically connected, the upper contact arm sections of the respective contact arm pairs are moved toward one another, i.e., are moved in a manner similar to a scissors closure by the joint, wherein the fixed contact pieces are clamped between the upper contact arm sections. Here, the electrical contact between the fixed contact piece and the movable contact piece is established via the upper part of the contact arm connected to the fixed contact piece.

When the current path is interrupted by the contact arrangement, the upper contact arm sections of the respective contact arm pair are moved away from one another, i.e., open like a scissors, wherein the fixed contact between the upper contact arm sections is released by the upper contact arm sections. The contact arm can be formed, for example, from a tubular metal part, for example a copper and/or aluminum tube.

In the connected or switched-on state of the high-voltage switching device, a good electrical contact between the fixed contact and the movable contact arm is required in order to conduct the current through the contact without losses or at least with low losses.

In order to make the isolating sections in, for example, isolating switches and earthing switches, well visible to the outside and for space reasons, the switches are usually not encapsulated and not mounted in a housing. Thus, elements or components of the high voltage switchgear may be exposed to weather influences. Wind and/or ice loads may cause the movable contact piece to move undesirably, in particular away from the fixed contact, which deteriorates the electrical contact and thus leads to higher electrical losses at the contact site. In extreme cases, the current path may inadvertently break and produce adverse consequences for the connected grid.

In the event of a short circuit, forces may arise as a result of the higher currents, for example by means of a magnetic field which varies around the component through which the current flows, i.e. by means of induction, which forces may cause the movable contact arm to move away from the fixed contact. This, like the weather influences, can lead to a deterioration of the electrical contact and thus to higher electrical losses at the contact points. In extreme cases, the current path may be inadvertently broken.

Due to the aforementioned problems, the reliability of the high voltage switchgear is limited and high electrical losses may result in high costs. Safe, controlled disconnection and connection of electrical contacts may be limited or infeasible. The adjustment of the contact surfaces between the movable contact piece and the stationary contact piece is costly and may be associated with a high material expenditure, since the contact pieces have to be changed and adapted as a whole. For example, in order to achieve a higher current with a lower electrical resistance, the tube as a whole must be designed with a larger cross section, more material and/or as a rectangular bar with a profile adapted to the contact surface. This increases the costs and reduces the design freedom, for example the adaptation of the profile to the mechanical stability requirements.

The object of the invention is to avoid or reduce the aforementioned problems. The object of the present invention is, in particular, to provide a contact arm arrangement for a high-voltage switchgear assembly and its use, which enable reliable functioning, in particular with low electrical losses in the connected state of the high-voltage switchgear assembly, and which enable a cost-effective, satisfactory, in particular modular, design.

The object is achieved according to the invention by the use of a contact arm arrangement for a high-voltage switching device having the features according to claim 1 and/or by the use of a contact arm arrangement according to claim 10. Advantageous embodiments of the contact arm arrangement and/or the use of the contact arm arrangement for a high-voltage switching device according to the invention are specified in the dependent claims. The features of the independent claims can be combined with the features of the dependent claims and the features of the dependent claims can be combined with one another.

The contact arm arrangement according to the invention for a high-voltage switching device comprises at least two contact arms which are arranged in pairs and are movable relative to one another by means of at least one hinge and which each comprise an upper contact arm part and a lower contact arm part. The upper parts of the contact arms each have at least one or exactly one recess designed to receive a contact element.

The recess in the upper part of the contact arm makes it possible to secure the contact element to the contact arm in a simple and cost-effective manner, in a stable and electrically conductive manner. In accordance with the scope of application of the high-voltage switchgear assembly, the contact element can be fixed to the upper part of the contact arm in a predetermined advantageous shape and made of a suitable material, independently of the shape and material of the upper part of the contact arm, by means of the recess. The shape of the upper part of the contact arm is independent of the shape of the electrical contact surface for electrical contact between the contact arm and the fixed contact. For example, T-shaped contact elements can be used, which are selected in accordance with the current and voltage ranges at the contact points. The T-shaped contact element can thus produce a larger contact surface between the movable contact piece and the fixed contact piece than a tubular, i.e. O-shaped, contact piece, which in the closed state of the high-voltage switchgear achieves a reliable current flow with low electrical losses. Contact elements made of copper with or without a coating made of silver, for example, or materials that are flame-resistant for a good electrical contact that is stable over time can be used. The contact element makes good electrical contact in the closed state of the high-voltage switchgear assembly, with low electrical losses and the resulting low costs, in particular even in adverse weather influences, for example in the case of wind and ice formation and/or in the case of short circuits in the electrical network.

In contrast to the upper part of the contact arm, which is formed by a component, in particular a round tube, it is possible, for example, to use contact elements with T-shaped profiles, which have an elongated contact surface on the tubular fixed contact. In contrast, the upper part of the cylindrical contact arm without contact elements has only a punctiform contact surface when connected to a tubular, i.e. cylindrical, fixed contact. The greater contact reliability during the movement of one contact piece along the longitudinal axis of the opposite contact piece is given by the larger contact surface, since the contact may only be partially along the longitudinal axis and not completely interrupted. A larger bearing surface also enables a better current flow with less electrical losses.

The design of the upper part of the contact arm with recesses for receiving the contact elements in each case enables a modular construction of the contact arm arrangement and a simple exchange of the contact elements. The contact elements can be selected independently of the remaining structure of the contact arm arrangement, and are optimized in terms of shape and material for better electrical contact, corresponding to the current and voltage ranges required for the high-voltage switching device. When worn, the contact element can simply be removed from the recess and replaced by a new contact element. Apart from the recesses, the design of the contact arms is independent of the contact elements and can be optimized with regard to material and shape with regard to performance, for example mechanical stability, and cost reduction.

The high-voltage switchgear may be a high-voltage disconnector, in particular in the form of a pantograph, or the high-voltage switchgear may be a high-voltage earthing switch, in particular in the form of a pantograph. The high-voltage switchgear can be designed in the form of a single-pole switchgear. The aforementioned advantages of the contact-arm arrangement are achieved in particular in isolating switches and earthing switches as well as single-pole switchgear and switchgear constructed in the form of a pantograph.

The contact arm arrangement may comprise a number of contact arms, the number of which may be related to parameters of an electrical network to which the high voltage switchgear is connected, in particular to an operating current and/or a short circuit current. A greater number of contact arms may be used when the maximum current and/or voltage present is greater. The number may also be selected based on the shape and shape of the contact arms, and a greater number of contact arms may be used, particularly when the contact arms have a reduced cross-section. Flexibility in the design of the contact-arm arrangement can lead to reduced costs, reliable operation and/or constant or reduced electrical losses occurring to the greatest extent at the contact points.

The lower contact arm part and/or the upper contact arm part can comprise at least two profile bars, which are rigidly connected to one another, in particular by spacer elements. This results in a mechanically stable contact arm arrangement with good electrical conductivity, which has a recess. Parts, such as contact elements and regions of other contact arms, can be arranged partially or completely in the recess. The contact arm part, for example the upper contact arm part, can be arranged in particular in the hinge region in the other contact arm part, for example the lower contact arm part, whereby a scissor-like movement is simply achieved.

The recess in the upper part of the contact arm for receiving the contact element can be designed as an elongated strip, in particular in the form of a slot, along the longitudinal axis of the upper part of the contact arm. The contact element can be simply arranged and fixed in the gap. The elongated design enables an elongated contact element to be arranged, in particular with a large contact surface and/or a rectangular contact surface, in order to achieve good contact performance, for example, during relative movement of the contact pieces.

The corresponding recess in the upper part of the contact arm can be designed in the form of a groove in the profile bar, in particular in a rectangular profile bar with rounded corners and edges. At least one contact element can be at least partially inserted into the recess, in particular in a T-shape, in mechanical and electrical contact with the profile bar. The groove can be produced simply and inexpensively, for example by milling, laser cutting, stamping. The T-shaped contact element can be inserted into the groove simply and mechanically stably, in particular making mechanical and electrical contact with the material on the upper part of the contact arm. This allows a simple and cost-effective design of the contact arm arrangement with the contact elements, which has good electrical properties for the contact between the contacts. The rounded corners and edges reduce or avoid corona phenomena and voltage breakdown.

Alternatively or additionally, the corresponding recess in the upper part of the contact arm can be formed in the form of a gap between at least two rectangular profile bars, which are fixed to one another at a distance from one another by spacer elements. In particular rectangular profile bars with rounded corners and edges can be arranged at intervals. At least one contact element can be inserted at least partially into the recess between the profile bars, in particular in a T-shape, in mechanical and electrical contact with the profile bars. The gap or recess for the contact element can be formed simply and cost-effectively by means of the spaced-apart profile bars. In this way, a contact arm arrangement with contact elements can be constructed in a simple and cost-effective manner, as described above, which has good electrical properties for the contact between the contact pieces. The rounded corners and edges of the rectangular profile bars reduce or avoid corona phenomena and voltage flashovers.

The contact arm arrangement may comprise at least one fixed contact which is in electrical contact with the at least two contact arms in the closed state of the current path of the high-voltage switching device. The fixed contact can be realized simply and inexpensively. Alternatively, a movable contact can also be used, which is moved in the direction of the upper part of the contact arm to close the contact point.

The contact arm arrangement may comprise two contact arm pairs each having two contact arms, in particular two contact arm pairs arranged parallel to one another, which are mechanically connected to one another by at least one connecting element, in particular by a connecting element arranged in the region of the hinge. The described design results in a mechanically stable, cost-effective contact arm arrangement which can be used, in particular, in the form of a pantograph and which has a high reliability in establishing and maintaining an electrical contact by means of two contact arms and a high current carrying capacity by means of, in particular, a total of four contact arms.

In the case of a contact arm arrangement with contact arms as described above, good electrical contact is made without high losses in the switched-on state of the high-voltage switching device, in particular the T-shaped contact element of the respective movable contact arm makes electrical and mechanical contact with the stationary contact, in particular in the form of a cylindrical tube.

The contact arm can roll on the fixed contact when the contact arm moves on the fixed contact, in particular in the event of a short circuit and/or in the event of wind and/or in the event of ice loading, wherein the contact surface between the fixed contact and the T-shaped contact element, in particular the surface on the upper side of the horizontal web of the T-shaped contact element, is continuously electrically contacted by its rounding, the effective contact area between the contact arm and the fixed contact remaining unchanged.

The use according to the invention of the aforementioned contact arm arrangement comprises the use of the contact arm arrangement in a high-voltage switchgear assembly in the form of a pantograph. The pantograph can form a good contact by clamping at least one contact piece between the opposing contact pieces, said contact being mechanically and electrically stable with less electrical losses. The scissor-like movement of the contact piece of the pantograph can be reliably achieved in a simple manner with low drive energy without the contact piece jamming, which achieves high reliability and low electrical losses in the switched-on state of the high-voltage switchgear.

The high-voltage switchgear may be included in and/or electrically connected to a high-voltage network, in particular a high-voltage network having an operating voltage above 1000V. The aforementioned advantages occur particularly actively in high-voltage networks.

The advantages of the application according to the invention of the aforementioned contact arm arrangement according to claim 10 are similar to the aforementioned advantages of the contact arm arrangement for a high voltage switchgear according to claim 1 and vice versa.

Embodiments of the present invention are schematically illustrated in fig. 1-7 and described in detail below. In the drawings:

fig. 1 shows a high-voltage switchgear 1 in the form of a pantograph, which has a contact arm arrangement 2 according to the invention, schematically in a side view, and

fig. 2 shows the contact arm arrangement 2 of fig. 1 in more detail with two contact arms 7 of a contact arm pair, which comprise a contact arm upper part 8 and a contact arm lower part 9, respectively, which are connected by a hinge 10, and

fig. 3 shows two parallel contact arm pairs with the contact arms 7 of fig. 2, which are rigidly connected by a connecting element 11, and

fig. 4 shows a first embodiment of the upper part 8 of the contact arm, which has a groove 12 as a recess for the contact element, and

fig. 5 shows a second exemplary embodiment of the upper part 8 of the contact arm, which has recesses for the contact elements, which are arranged at a distance between two profile bars 13 by means of spacer elements 15, and which are arranged between the two profile bars 13

Fig. 6 shows the upper part 8 of the contact arm according to fig. 4, in which the contact element 17 is arranged in the groove 12 as a recess, and

fig. 7 shows the upper part 8 of the contact arm according to fig. 5, in which a contact element 17 is arranged in a recess between the two profile rods 13.

Fig. 1 shows a high-voltage switchgear 1 in the form of a pantograph as a single-pole disconnector. The high-voltage disconnector 1 has a contact arm arrangement 2 according to the invention, which is arranged on a carrier frame arrangement 5 with an insulating body 4. In the illustrated exemplary embodiment of the single-pole disconnector, a contact arm arrangement 2 in the form of a pantograph with a contact arm 7 is arranged on a supporting frame arrangement 5 which is designed like a supporting foot and which, in the closed state of the current path of the high-voltage switchgear 1, is in electrical and, in particular, mechanical contact with a counter-contact 3 which is designed as a fixed contact. A current path, for example in a high-voltage network, is shown closed by the high-voltage switching device 1, with an electrical contact between the fixed contact 3 and the contact arm 7. The open state is shown by means of a dashed line, by means of which the movement path of the contact arm 7 is shown, wherein the current path between the fixed contact 3 and the contact arm 7 is interrupted.

The movement of the contact arm 7 or the switching between the open state and the closed state of the high-voltage switching device 1 is effected in a driven manner by means of a driver 6 on the carrying frame arrangement 5. The motion is transmitted from the driver 6 to the contact arm arrangement 2, for example, via a kinetic chain, for example, with elements such as the insulator 4 or a shaft in the insulator 4. The drive 6 can be, for example, an electric motor, in particular an electric motor, or a spring-loaded drive. The kinetic chain may comprise elements such as a transmission, a steering wheel and/or an axle.

The contact arm arrangement 2 of fig. 1 is shown in fig. 2 in a side view in greater detail, the plane of movement of the contact arm 7 lying in the drawing plane.

The two contact arms 7 of the shown contact arm pair each comprise an upper contact arm part 8 and a lower contact arm part 9 which are connected to each other by means of a hinge 10. The two contact arms 7 of the contact arm pair are mounted so as to be movable in a joint manner by means of a hinge 10. The hinge 10 carries out a movement in which the contact arm upper parts 8 move toward one another in the upper region above the hinge 10 between two contact arms when the current path of the high-voltage switching device 1 is closed and move away from one another when the current path is open. The contact arms 7 form a type of scissors with the hinge 10 between the two contact arms 7, between the legs of which the counter-contact 3 is mechanically clamped when the current path is closed. The counter contact 3 is not shown in fig. 2 for the sake of simplicity.

The upper contact arm part 8 and the lower contact arm part 9 of the contact arm 7 are each movably connected to one another by a hinge 10. Due to the connection of the two contact arms 7 or the two upper contact arm portions 8 by the hinge 10, the movement of the hinge 10, i.e. the hinge 10 which connects the lower contact arm portion 9 and the upper contact arm portion 8 to one another at the ends, away from one another, causes the scissors formed by the upper contact arm portions 8 to open. The hinge 10 for connecting the two contact arms 7 or the upper parts 8 of the two contact arms is moved downward. In this position, the current path is broken by the high-voltage switchgear 1.

The movement of the contact arms 7 is effected in each case by rotation of the lower contact arm parts 9 about an axis perpendicular to the drawing plane of fig. 2, wherein the rotation axis is arranged at the end of the respective lower contact arm part 9 which is opposite the end of the lower contact arm part 9 having the hinge 10. The rotary movement of the lower part 9 of the contact arm about its lower end is effected by the drive 6 in a transmission manner via a kinematic chain. For opening the current path, the contact arm lower parts 9 are rotated away from each other in opposite directions, i.e. the contact arm lower part 9 on the right is rotated in a clockwise direction and the contact arm lower part 9 on the left is rotated in a counter-clockwise direction. To close the current path, the contact arm lower parts 9 are rotated towards each other in opposite directions, i.e. the contact arm lower part 9 on the right is rotated in the counterclockwise direction and the contact arm lower part 9 on the left is rotated in the clockwise direction.

Similar to a pantograph, the rotary movement of the two lower contact arm parts 9 about axes at the ends of the lower contact arm parts 9 in each case moves the upper contact arm part 8. The movement of the lower contact arm portions 9 away from each other in conjunction with the movement of the hinge 10 connecting the lower contact arm portions 9 to the upper contact arm portions 8 moves the lower end portions and the upper end portions of the upper contact arm portions 8 away from each other. The scissors or the contact with the counter contact 3 is opened and the current path is interrupted. Here, the hinge 10, which connects the upper contact arm portions 8 of the two contact arms 7 to one another, is moved downwards. The ends of the upper contact arm parts 8 move downwards and the freely movable ends of the two lower contact arm parts 9 move downwards respectively. The position or height, respectively, of the end of the lower part 9 of the contact arm, where the axis of rotation is located, relative to the carrying frame arrangement 5 is constant.

The lower portion 9 of the contact arm moves toward each other in accordance with the movement of the hinge 10 connecting the lower portion 9 of the contact arm to the upper portion 8 of the contact arm, and the lower end portion and the upper end portion of the upper portion 8 of the contact arm also move toward each other. The scissors or the contact with the counter contact 3 is closed and the current path is closed, i.e. the counter contact 3 is clamped in an electrically conductive manner between the upper ends of the contact arm upper parts 8. Here, the hinge 10, which connects the upper contact arm portions 8 of the two contact arms 7 to one another, is moved upwards. The ends of the upper contact arm parts 8 move upwards and the freely movable ends of the two lower contact arm parts 9 move upwards respectively. The position or height, respectively, of the end of the lower part 9 of the contact arm, where the axis of rotation is located, relative to the carrying frame arrangement 5 is constant.

The contact arm upper portion 8 may have a bent portion as shown in fig. 2. Thereby, the upper end portions of the contact arm upper portions 8 are bent toward each other. When the contacts or the current paths are closed, the counter-contact 3 is clamped between the upper ends of the upper contact arm parts 8, after which the lower end of the upper contact arm part 8 or the upper end of the lower contact arm part 9 or the hinge 10, which connects the upper and lower contact arm parts 8 and 9 in a movable manner, respectively, touches one another. Good clamping of the counter-contact 3 can thereby be achieved without the contact arm upper part 8 or the contact arm lower part 9 respectively touching at their ends or touching of the connected hinge 10 and thus hindering the clamping. The mutually directed hook-shaped structures at the upper end of the contact arm upper part 8 can reduce the freedom of movement of the contact arm 7 in the clamped state. This enables the closed state of the high-voltage switchgear assembly 1 to be better maintained, for example, in the event of weather influences such as wind or short circuits.

Fig. 3 shows two parallel contact arm pairs with the contact arms 7 of fig. 2, which are rigidly connected by a connecting element 11. The connecting element 11 is arranged in fig. 3 between the pair of contact arms, for example in the form of a shaft or rod, perpendicular to the drawing plane of fig. 2. The connecting elements 11 are each arranged at a hinge 10 and each connect two corresponding hinges 10 of opposite contact arm pairs to one another. The three connecting elements 11 are of equal length, whereby the pairs of contact arms are arranged parallel to each other. The tubular counter-contacts 3 are arranged with their longitudinal axes parallel to the longitudinal axis of the connecting element 11. For simplicity, the counter contact 3 is not shown in fig. 3.

The contact arm arrangement of fig. 3, which has two contact arm pairs arranged parallel to one another and having contact arms 7 according to fig. 2, achieves improved clamping with lower electrical losses compared to clamping of the opposing contact 3 by only one contact arm pair. In the closed state of the high-voltage switching device 1, four contact points are formed between the upper contact arm part 8 or the contact arm 7 and the opposing contact 3. By means of the four contact points, a current flow is achieved with a lower resistance or with fewer losses than in the case of two contact points with only one contact arm pair, and clamping is achieved more reliably and mechanically more stably.

Fig. 4 shows the upper end of the upper contact arm part 8 of the contact arm 7 shown in fig. 1 to 3. The broken line 16 indicates the aforementioned bending axis or bend in the upper part 8 of the contact arm. The elongated recess in the upper portion 8 of the contact arm is formed by an elongated slot 12 along the longitudinal axis of the upper portion 8 of the contact arm. The slot 12 can be designed through the entire cross section of the upper part 8 of the contact arm or only in a surface area which does not exceed a certain depth, for example in the region of a few centimeters in the upper part 8 of the contact arm.

An alternative embodiment of the upper portion 8 of the contact arm shown in fig. 4 is shown in fig. 5. The recess is formed between two profile bars 13 arranged parallel to each other by a spacer element 15 between said profile bars 13. The distance between the profile bars 13 or the width of the spacer elements 15 results in the width of the recess, and the distance of the spacer elements 15 from one another results in the length of the recess along the longitudinal axis of the upper part 8 of the contact arm. The spacer element 15 can be fastened to the two profile bars 13 of the upper part 8 of the contact arm, for example, by means of screws and/or welding and/or soldering and/or gluing. The spacer element holds the two profile bars 13 at a constant distance from one another, in particular along the longitudinal axis of the profile bar 13 or of the contact arm upper part 8. The fastening elements 14 can be arranged along the longitudinal axis of the profile rod 13 or of the contact arm upper part 8 in order to connect the two profile rods 13 to one another in a mechanically stable and, in particular, electrically stable manner. The lower contact arm part 9 can be formed, like the upper contact arm part 8, from two profile bars 13 with fastening elements 14 and/or spacer elements 15.

Fig. 6 shows a sectional view of the upper part 8 of the contact arm according to fig. 4, the contact element 17 being arranged in the groove 12 as a recess.

The upper contact arm part 8 is designed in the exemplary embodiment of fig. 6 with a rectangular cross section, said upper contact arm part 8 having a profile rod 13 and a contact element 17 which is connected spatially and electrically conductively to the profile rod 13. The profile rod 13 with the wall 20 is hollow on the inside and is designed as a rod with a rectangular cross section perpendicular to the longitudinal axis of the rod. The edges of the profile bars 13 are rounded to prevent overpressure at the corners and edges. On one side, in fig. 6 on the upper side of the profile bar 13, a groove or through-going recess is arranged through the wall 20. The grooves are designed linearly along the longitudinal axis of the profile rod 13 and connect the inner space of the profile rod 13 with the outer space.

The contact element 17 is arranged or inserted in a form-fitting manner in the groove. The contact elements 17 are designed as strips, i.e. elongated, in particular not hollow on the inside. The contact element 17 has a T-shape in cross section and is designed like a rail. Holes are arranged on the vertical face 19 extending laterally through the contact elements 17, said holes corresponding to holes in the side faces of the profile bars 13. The bolt 14 and/or the pin can be guided through the hole to fix the contact element 17 to the profile rod 13 mechanically stable and/or with good electrical conductivity. In order to achieve increased mechanical stability and better electrical conductivity, spacer elements 21 can be inserted along the fixing elements 14 in the interior region of the profile rod 13 between the wall 20 of the profile rod and the contact surface 19.

The profile rod 13 can be made of copper and/or aluminum. For good electrical conductivity and good electrical contact, the contact element 17 can be made of copper and is mechanically fixed by the profile rod 13. The illustrated construction shows the upper contact arm part 8, which has a high mechanical stability and good electrical contacting properties in contact with the fixed or counter-contact 3. The lower contact arm part 9 of the contact arm 7 can be constructed similarly to the upper contact arm part 8, but without the groove 12 and/or the contact element 17.

Fig. 7 shows a sectional view of the upper part 8 of the contact arm according to fig. 5, the contact element 17 being arranged in a recess between the two profile rods 13.

The upper part 9 of the contact arm of fig. 7 does not have the profile rod 13 with a rectangular cross section as shown in fig. 6, but has two profile rods 13 with an oval cross section arranged parallel to one another. The oval cross section or wall 20 of the profile rod 13 consists of two flat, parallel sides which are mechanically connected to one another in the middle by a web 18 perpendicular to the sides, which extends along the length of the profile rod 13, and two semicircles with a radius r, which connect the opposite ends of the planes to one another parallel to the web 18.

The two profile bars 13 are arranged at a distance from one another, parallel to one another, so that a gap or recess is formed between the profile bars 13. In the slot, a T-shaped contact 17 is arranged, similar to the contact 17 in the slot in fig. 6. Fastening elements 14, in particular bolts, rivets and/or pins, can be used to connect the profile bars 13 to one another and to the contact piece 17 in a mechanically stable manner. The bolt 14 with the nut can hold the contact arm upper parts 8 together and/or press them together via the outer sides of the contact arm upper parts 8 or the outer sides of the two profile bars 13, as shown in fig. 7. Alternatively or in the alternative, a screw 14 with a nut can act on the inner surface of the profile rod 13 in order to hold the contact arm or the profile rod 13 and the contact piece together and/or to press them together.

Spacer elements 15 having the same thickness as the contact elements 17 in the lower region can be arranged between the profile bars 13, in particular in the region of the fixing elements 14. Since the contact elements 17 are arranged between the profile rods 13 in the upper region of the profile rods 13 and the spacer elements 15 are arranged between the profile rods 13 in the lower region of the profile rods 13, the two profile rods 13 of the contact arm upper part 8 are fixed in parallel relative to one another. The lower contact arm part 9 of the contact arm 7 can be of similar design to the upper contact arm part 8, but without the contact elements 17 and instead of the contact elements 17 in the upper region of the profile bar 13 with the spacer elements 15.

The embodiments described above may be combined with each other and/or with the prior art. Thus, the contact arm 7 may be used in different types of high voltage switchgear 1, for example. For example, a disconnector, in particular in the form of a pantograph, or an earthing switch may be used. Instead of a single-pole high-voltage disconnector 1, a high-voltage switchgear 1 having a plurality of, in particular movable, poles can also be used. The high-voltage switchgear 1 can be used for one or more phases in an electrical network.

The profile bar 13 can have different shapes. The profile bars 13 can thus be designed, for example, as shown in fig. 6, as rectangles with rounded edges, with one or more slits or grooves, or the profile bars 13 can be designed, for example, as shown in fig. 7, as ovals, with one or more recesses between a plurality of profile bars 13. One or respectively one contact element 17 can be arranged in the recess. Two or more profile bars 13 can be arranged, in particular, parallel to one another, as shown in fig. 7, and a contact element 17 or a plurality of contact elements 17 can be arranged or respectively arranged between the profile bars 13. The profile rod 13 can have a rectangular, oval and/or elliptical cross section, for example. All profile bars 13 can be designed with the same cross section or different cross sections, in particular with different shapes. A combination of the embodiments of fig. 6 and 7 can also be used, wherein the contact elements 17 are arranged between the profile bars 13 or in recesses of the respective profile bars 13.

Two, four or more contact arms 7 can be used for the contact arm arrangement 2. The contact arms may be arranged parallel and/or at an angle to each other. The contact arm upper part 8 and the contact arm lower part 9 may for example have the shape as shown in fig. 6, or have the shape as shown in fig. 7, or a combination of said shapes. Between the contact arms 7, electrically conductive or electrically non-conductive connecting elements 11 can be arranged. As shown in fig. 3, five connecting elements 11 may be used, or a smaller or larger number of connecting elements 11 may be used. The hinge 10 can comprise a shaft and/or a bearing and, if appropriate, additional elements for the transmission of current, which are made of a material that conducts electricity well, such as copper or aluminum.

The contact element 17 and the profile rod 13 may be connected to one another not by means of a bolt 14, rivet or pin, but for example by welding or gluing. The connecting element 14 and/or the profile rod 13 can be coated, for example silver-plated, to achieve better electrical conductivity. The contact surfaces between the parts or elements of the contact arms 7 can in particular be coated. The profile rod 13 and/or the contact element 17 can be made of one material, in particular a material which conducts electricity well, such as copper, or a mechanically stable material, such as steel or aluminum, and/or can have different materials and/or alloys.

List of reference numerals

1 high-voltage switchgear

2 contact arm device

3 opposite direction contact

4 insulating body

5 bearing frame device

6 driver

7 contact arm

Upper part of contact arm 8

9 lower part of contact arm

10 hinge

11 connecting element

12 groove

13 section bar

14 fixing element

15 spacer element

16 bending shaft

17 contact element

18 connecting sheet

19 contact surface of contact element

Wall of 20-section bar

21 spacer element

Claims

1. A contact arm arrangement (2) for a high-voltage switching device (1) has at least two contact arms (7), the contact arms are arranged in pairs and movably relative to each other by at least one hinge (10), and the contact arms respectively comprise an upper contact arm part (8) and a lower contact arm part (9), wherein the upper contact arm parts (8) each have at least one recess designed to receive a contact element (17), characterized in that the corresponding recess of the upper part (8) of the contact arm is formed in the form of a gap between at least two rectangular profile bars (13), the rectangular profile rods are fixed to each other at a distance by spacer elements (15), and/or wherein at least one contact element (17) is at least partially embedded in a recess between the profile bars (13), in mechanical and electrical contact with the profile bars (13).

2. The contact arm arrangement (2) as claimed in claim 1, characterized in that the rectangular profile bar (13) has rounded corners and edges.

3. The contact arm arrangement (2) according to claim 1, characterized in that the contact element (17) has a T-shape.

4. The contact arm arrangement (2) according to claim 1, characterized in that the lower contact arm part (9) and/or the upper contact arm part (8) comprise at least two profile bars (13), which are rigidly connected to one another by spacer elements (15).

5. The contact arm arrangement (2) as claimed in claim 1, characterized in that the recess of the upper contact arm part (8) for receiving the contact element (17) is designed as an elongated strip along the longitudinal axis of the upper contact arm part (8).

6. The contact arm arrangement (2) as claimed in claim 1, characterized in that the corresponding recess of the upper part (8) of the contact arm is designed in the form of a groove (12) in the profile bar (13) and/or at least one contact element (17) is at least partially inserted into the groove (12) and is in mechanical and electrical contact with the profile bar (13).

7. The contact arm arrangement (2) as claimed in claim 1, comprising two contact arm pairs each having two contact arms (7), which are mechanically connected to one another by at least one connecting element (11).

8. The contact arm arrangement (2) as claimed in claim 7, characterized in that the contact arm pairs are mechanically connected to one another by connecting elements (11) which are each arranged in the region of the hinge (10).

9. Use of a contact arm arrangement (2) according to one of claims 1 to 8, characterized in that the contact arm arrangement (2) is used in a high-voltage switchgear (1) in the form of a pantograph.

10. Use of a contact arm arrangement (2) according to claim 9, characterised in that the high voltage switchgear (1) is comprised in and/or electrically connected to a high voltage network.