Overhead conductor rail and overhead line system with overhead conductor rail

Abstract

The invention relates to an overhead conductor rail (2) for guiding a contact line (3) and to an overhead line system (1) having at least one overhead conductor rail (2), wherein the overhead conductor rail (2) and the contact line (3) consist of different materials and the overhead conductor rail (2) and / or the contact line (3) has a lubricant (4), wherein the lubricant (4) is applied as a substantially complete, uninterrupted film at least between the contact points (13, 14) of the overhead conductor rail (2) and the contact line (3), and the lubricant (4) has at least one additive, as a result of which the coefficient of friction between the overhead conductor rail (2) and the contact line (3) is increased to such an extent that the pull-out force of the contact line (3) rises to at least 1.2 kN / m, and ensures the conductivity between the overhead conductor rail (2) and the contact line (3).

Description

[0001] Description

[0002] Overhead conductor rail and overhead line system with overhead conductor rail

[0003] In order to reach inner-city areas with local trains such as subways or light rails, or even with long-distance trains, railway lines are often inevitably laid in tunnels. Electric traction must be ensured even in confined spaces, such as small or narrow tunnel cross-sections. For this purpose, low-profile overhead conductor rails are typically used. These can be driven on by one or more pantographs. Depending on the design, they can be used not only in tunnels, but also under bridges, on lifting bridges, and in maintenance facilities.

[0004] The overhead conductor rail usually consists of an extruded profile into which a contact wire is clamped, via which the current is transmitted to the relevant vehicle, just like a conventional overhead line in an overhead line system. The clamped connection must be electrically conductive. Depending on the structural conditions or requirements, different materials are used for the overhead conductor rails and the contact wire, which may have different electrode potentials, so that there is a risk of contact corrosion, which could damage the overhead conductor rails, for example. In such cases, this is usually counteracted by the defined application of a lubricant, for example a lubricant or contact grease, between the different materials when the overhead conductor wire is pulled into the overhead conductor rail(s). Such a lubricant orContact grease normally acts as an insulator and obtains the necessary electrical conductivity through the addition of electrically conductive additives, in particular particles. When transitioning to or out of a tunnel, there is a transition from normal, conventional overhead line operation to overhead conductor rail operation and vice versa. In particular when a vehicle exits a tunnel when transitioning to a catenary system, i.e. when transitioning from overhead conductor rail operation to conventional overhead line operation, tensile forces act on the contact wire outside the tunnel which can pull the contact wire out of the overhead conductor rail profile. Due to corresponding specifications due to increased safety requirements, the overhead conductor rail orThe overhead conductor rail profile must now have a certain minimum clamping force which can withstand a pull-out force of the contact wire in the axial direction from the conductor rail, in particular the overhead conductor rail, of 1.2 kN / m, whereby at the same time the previous properties should not be restricted. However, the use of overhead conductor rails with conventional lubricating greases, for example contact greases in the necessary situations with different materials, has more of a friction-reducing effect and thus reduces the minimum clamping force of the corresponding overhead conductor rails, so that under certain circumstances this may no longer be sufficient to withstand the required pull-out force of the contact wire in the axial direction from the overhead conductor rail of 1.2 kN / m.

[0005] The invention is based on the object of specifying a ceiling conductor rail with improved properties.

[0006] The problem is solved by the features of independent patent claim 1. Further developments and refinements of the invention can be found in the features of the dependent patent claims.

[0007] For this purpose, an overhead conductor rail of an overhead line system for guiding a contact wire is specified with a lubricant, wherein the lubricant is applied as a substantially complete, uninterrupted film at least between the contact points of the overhead conductor rail and the contact wire, and the lubricant has at least one additive, wherein the lubricant with the at least one additive causes a larger coefficient of friction with substantially constant electrical conductivity between the overhead conductor rail and the contact wire.

[0008] By adding at least one additive to the lubricant in question, the coefficient of friction between the overhead conductor rail and the contact wire is increased, which advantageously increases the pull-out force of the contact wire in the axial direction from the conductor rail or overhead conductor rail. At the same time, despite the addition of at least one additive, the electrical conductivity between the overhead conductor rail and the contact wire remains essentially the same, thereby maintaining the quality of the current conduction and / or transmission at at least the same or comparable level and thus further ensuring its quality.

[0009] The lubricant with the at least one additive particularly preferably has greater adhesion to the overhead conductor rail and the contact wire. Due to the improved or greater adhesion of the lubricant with the at least one additive compared to a lubricant without the at least one additive, the lubricant adheres more permanently to the overhead conductor rail and the contact wire, whereby contact corrosion due to different electrode potentials of the different materials between the overhead conductor rail and the contact wire is advantageously permanently prevented over a longer period of time. The addition of the additive also influences the possibly different electrode potentials of the overhead conductor rail and the lubricant.Portions, such as particles, of the lubricant, thereby reducing potential differences and thus suppressing the formation of corrosion particles, which would otherwise attack the material of the ceiling conductor rail, thus permanently preventing contact corrosion. Furthermore, resistance to environmental influences, such as weather resistance, particularly moisture, is also improved, extending the overall corrosion protection during active operation far beyond the usual period.

[0010] According to a preferred embodiment of the invention, the at least one additive is or are aluminum oxide particles. The lubricant preferably comprises between 2 and 10% aluminum oxide particles. Particularly preferably, the lubricant comprises 5% aluminum oxide particles, with a maximum deviation of 10%.

[0011] By adding aluminum oxide particles, for example between 2 and 10%, the coefficient of friction between the conductor rail or overhead conductor rail and the contact wire increases, which in particular allows the minimum clamping force of the overhead conductor rail to be gradually improved so that it reaches the required pull-out force of the contact wire in the axial direction from the conductor rail of at least 1.2 kN / m and can withstand this, despite greasing, which basically has more of a friction-reducing effect. With an addition of around 5% aluminum oxide particles with a maximum deviation in the order of 10%, i.e. between 4.5 and 5.5%, a minimum clamping force is even achieved which corresponds to a pull-out force of the contact wire from the overhead conductor rail of 1.5 kN / m.This means that the required extraction force is far exceeded, so that a correspondingly large buffer is available to ensure safety during operation.

[0012] The electrically conductive connection between the contact wire and the power rail or overhead conductor rail is still guaranteed without restriction. The adhesion is slightly improved by the addition of the aluminum oxide particles, which in turn also improves the corrosion protection between the different materials from which the overhead conductor rail is made, for example aluminum or an aluminum alloy, or the contact wire, for example copper or a copper alloy. The risk of contact corrosion due to the different electrode potentials of the different materials, here for example aluminum and copper, and also due to the potential differences between the overhead conductor rail and the lubricant, which can lead to decomposition of the aluminum conductor rail or the overhead conductor rail, is reduced.The risk of an aluminium ceiling conductor rail being damaged is further reduced, particularly by means of the added aluminium oxide particles.

[0013] According to another particularly preferred embodiment of the invention, the lubricant is applied to the contact points between the contact wire and the overhead conductor rail and to the part of the contact wire that runs within the overhead conductor rail. This reliably protects the majority of the contact wire against weather conditions and the effects of weather, thus reducing the need for costly maintenance with operational interruptions at least after extended intervals.

[0014] According to a further preferred embodiment of the invention, the lubricant applied to the contact wire has a thickness of between 100 and 500 micrometers. This makes the lubricant layer thick enough to completely or at least almost completely prevent the risk of at least some tearing of the lubricant film or contact grease, particularly at the contact points between the overhead conductor rail and the contact wire. At the same time, the lubricant film is thin enough to have a detrimental effect, for example, in terms of a significant reduction in friction and thus reducing the pull-out force.

[0015] Particularly preferred is an extruded aluminum alloy profile. These are particularly lightweight and therefore particularly suitable for installation in space-constrained environments, such as tunnels or under bridges. Their large cross-section also enables high energy transfer. They are also considered crack-resistant, eliminating the need for grounding in the cracked area of ​​the overhead line. Furthermore, they allow only the contact wire to be replaced when the wear limit is reached.

[0016] The contact wire running from the overhead conductor rail is preferably made of copper or a copper alloy. Due to its high electrical conductivity, this is particularly advantageous for current conduction and / or transmission.

[0017] Particularly preferably, an overhead line system has at least one ceiling conductor rail according to one of claims 1 to 8.

[0018] In summary, the invention relates to an overhead conductor rail for guiding a contact wire and to an overhead line system with at least one such overhead conductor rail, wherein the overhead conductor rail and the contact wire consist of different materials and the overhead conductor rail has a lubricant which acts as a substantially complete, uninterrupted lubricant film or.A contact grease layer is applied at least between the contact points of the overhead conductor rail and the contact wire, and the lubricant contains at least one additive, for example aluminum oxide particles, as a result of which the coefficient of friction between the overhead conductor rail and the contact wire is increased to such an extent that the pull-out force of the contact wire in the axial direction from the overhead conductor rail increases to at least 1.2 kN / m and an essentially constant electrical conductivity is provided between the contact points of the overhead conductor rail and the contact wire. Furthermore, corrosion protection is also improved because the addition of the at least one additive, for example aluminum oxide particles, also improves the adhesive properties of the lubricant.In particular, this permanently prevents contact corrosion between the overhead conductor rail and the contact wire due to their different materials over a longer period of time. Preferred embodiments of the invention are explained in more detail below with reference to the drawings. They show:

[0019] Fig. 1 shows a profile of an overhead conductor rail according to the invention with clamped contact wire,

[0020] Fig. 2 shows a cross-section of a contact wire with applied lubricant and

[0021] Fig . 3 a sketch of an overhead line system with the transition from a catenary to an overhead conductor rail outside a tunnel or underpass .

[0022] In Figures 1 to 3, identical components are designated by the same reference numerals.

[0023] Figure 1 shows a profile of an overhead conductor rail 2 according to the invention with a clamped-in contact wire 3. The overhead conductor rail 2 shown in Figure 1 consists of an aluminum alloy extruded profile. The contact wire 3 consists of copper or a copper alloy and is clamped in the profile of the overhead conductor rail 2 by means of the clamping arms 5 and 6. Due to the different electrode potentials exhibited by the two metals aluminum and copper, there is normally a risk of contact corrosion, which in the present case would lead to decomposition of the aluminum overhead conductor rail 2. This is prevented by applying a lubricant 4 or contact grease, in particular to the contact points 13 and 14 between the overhead conductor rail 2 and the contact wire 3 over their entire length as an essentially complete, uninterrupted film when the contact wire 3 is pulled into the overhead conductor rail 2, thereby ensuring effective corrosion protection.In Figure 1, the lubricant 4 also coats the part of the contact wire 3 within the overhead conductor rail profile 2 above the contact points 13 and 14. For clarity, this is shown in detail in Figure 2. The lubricant or contact grease 4 shown in Figure 1 has a proportion of aluminum oxide particles of 5% + / - a maximum of 10%, which according to the invention increases the coefficient of friction between the overhead conductor rail 2 and the contact wire 3, and the overhead conductor rail 2, or the clamping arms 5 and 6, thus achieves a minimum clamping force which corresponds to a pull-out force of the contact wire 3 from the overhead conductor rail 2 in the axial direction of 1.5 kN / m, so that the required or The required pull-out force of the contact wire in the axial direction from the conductor rail of at least 1.2 kN / m is far exceeded.Accordingly, a sufficiently large buffer is provided to ensure safety during operation of the overhead line system 1. The electrically conductive connection between the contact wire 3 and the conductor rail or overhead conductor rail 2 remains intact. The adhesion of the lubricant 4 is also improved by the addition of the aluminum oxide particles, thus further improving corrosion protection.

[0024] Figure 2 shows a cross-section of the contact wire 3 with applied lubricant 4 according to the embodiments in Figure 1. The contact wire 3 has the usual indentations 11 and 12 for the two clamping arms 5 and 6 of the overhead conductor rail profile 2 (which are not shown here for better clarity), by means of which the contact wire 3 is clamped in the overhead conductor rail profile 2 according to Figure 1. By clamping the contact wire 3 by the clamping arms 5, 6, the contact points 13 and 14 are automatically created, at which the contact wire 3 and the overhead conductor rail 2 would come into direct contact without the lubricant or contact grease 4. As shown in Figure 2, the lubricant or contact grease 4 covers the contact wire 3. Contact grease 4 the contact wire 3 in particular over the entire length of the overhead conductor rail(s) 2 along the contact points 13 and 14, whereby the contact wire 3 and the overhead conductor rail 2 do not touch directly, but are separated by the lubricant 4.This ensures that the two different materials, aluminum and copper, do not touch each other and are therefore protected from contact corrosion.

[0025] In addition, the lubricant or contact grease 4 additionally covers the upper hemispherical section of the contact wire 3 between the contact points 13 and 14 and extends slightly downwards beyond the contact points 13 and 14, as a result of which the largest part of the contact wire 3 is reliably protected against weather conditions or against the effects of weather and corrosive media, and as a result cost-intensive maintenance with interruptions in operation is only necessary at least after extended intervals. The lubricant 4 applied to the contact wire 3 has a thickness of between 100 and 500 micrometers, as a result of which the lubricant layer 4 is thick enough to prevent the lubricant film or the contact wire from breaking off, at least in places.of the contact grease 4, in particular at the contact points 13 and 14 between the overhead conductor rail 2 and the contact wire 3, but at the same time is thin enough not to have a detrimental effect, for example with regard to a significant reduction in friction and thus to reduce the extraction force accordingly.

[0026] Figure 3 shows a sketch of an overhead line system 1 with the transition 20 of a catenary 9 to an overhead conductor rail 2 according to the invention in the area of ​​a tunnel or an underpass 15.

[0027] Outside the tunnel 15, the overhead line system 1 shown as an example in Figure 3 is of conventional construction with a catenary 9, a supporting cable 8, which is guided at a height h above the contact wire 3 and the supporting cable 8 is connected to the contact wire 3 by means of a hanger 10. The transition area 20 for operation by means of an overhead conductor rail 2 within the tunnel or an underpass 15 begins, for example, at the entrance already before, or ends at the exit accordingly after. Furthermore, the extraction force F Zug which acts in the axial direction of the contact wire 3 and tries to pull the contact wire 3 out of the overhead conductor rail 2 .

Claims

Patent claims 1. Overhead conductor rail (2) of an overhead line system (1) for guiding a contact wire (3), wherein the overhead conductor rail has a lubricant (4) and wherein the overhead conductor rail (2) and the contact wire (3) are made of different materials, characterized in that the lubricant (4) is applied as a substantially complete, uninterrupted film at least between the contact points (13, 14) of the overhead conductor rail (2) and the contact wire (3), and the lubricant (4) has at least one additive, wherein the lubricant (4) with the at least one additive brings about a larger coefficient of friction with substantially constant electrical conductivity between the overhead conductor rail (2) and the contact wire (3).

2. Overhead conductor rail (2) according to claim 1, characterized in that the lubricant (4) with the at least one additive has a greater adhesive power with respect to the overhead conductor rail (2) and the contact wire (3).

3. Ceiling conductor rail (2) according to claim 1 or 2, characterized in that the at least one additive is aluminum oxide particles.

4. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) contains between 2 and 10% aluminum oxide particles.

5. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) contains 5% aluminum oxide particles with a maximum deviation of 10%.

6. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) is applied to the contact points (13, 14) of the contact wire (3) to the overhead conductor rail (2) and to the part of the contact wire (3) which runs within the overhead conductor rail (2).

7. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) applied to the contact wire (3) has a thickness of between 100 and 500 micrometers.

8. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the ceiling conductor rail (2) is designed as an aluminum alloy extruded profile.

9. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the contact wire (3) guided by the overhead conductor rail consists of copper or a copper alloy.

10. Overhead line system (1) with at least one overhead conductor rail (2) according to one of claims 1 to 9.

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