Sliding contact device for contacting a movable arcing contact of a vacuum switch

Abstract

The invention relates to solutions in respect of a sliding contact device for contacting a movable arcing contact (6) of a vacuum switch under high-voltage conditions. Advantageously, the suggested solutions are characterised by low moving masses and low contact resistances.

Description

[0001] Sliding contact device for contacting a movable

[0002] Arcing contact of a vacuum switch

[0003] The invention relates to the contacting of an axially movable arcing contact with a fixed hollow contact tube of a vacuum switch.

[0004] Until now, in vacuum switches, the contact between the moving arcing contact and the stationary contact tube has been achieved by a clamped sleeve, to which a contact ring is screwed, which also contains a lamellar strip contact. The design-related high number of contact transitions leads to high contact resistance, which is detrimental to the thermal load capacity of the vacuum switch. The high mass of this design must also be accelerated to the high required contact speed. This leads to increased mechanical loads on the kinematic chain; moreover, correspondingly high drive energies are required.

[0005] Another known solution uses a current strip. Since higher contact speeds are required at high voltage levels, such as high voltage, this solution is also subject to high mechanical stress.

[0006] The invention is based on the object of designing the contact between the movable arcing contact of the vacuum tube and the fixed contact tube of the vacuum switch in such a way that reliable contacting of the moving arcing contact is achieved with a low moving mass and low contact resistance.

[0007] The problem is solved by a sliding contact device for contacting a movable arcing contact of a vacuum switch, comprising the features of claim 1, claim 3, and claim 6. The proposed solutions are advantageously characterized by low moving masses and low contact resistances.

[0008] Advantageous further developments of the invention are specified in the subclaims.

[0009] The invention is explained in more detail below as an exemplary embodiment to the extent necessary for understanding with reference to figures.

[0010] Showing:

[0011] Fig. 1 shows a first contact according to the invention of an axially movable arcing contact of a vacuum switch,

[0012] Fig. 2 shows a section of the arrangement from Fig. 1 along the section plane I I- II ,

[0013] Fig. 3 shows a second contact according to the invention of an axially movable arcing contact of a vacuum switch,

[0014] Fig. 4 shows a third contact according to the invention of an axially movable arcing contact of a vacuum switch and

[0015] Fig 5 a section of the arrangement from Fig 4 along the section plane VV,

[0016] In the figures, like designations refer to like elements.

[0017] In the embodiment according to Fig. 1, electrically conductive fins 10 (for example three) are attached to the movable arcing contact 6 of the vacuum tube 4, which run in corresponding contact grooves of the counter contact. A contact groove can be formed, for example, by two conductive webs 12 in the stationary, hollow contact tube 5, which are provided with electrically conductive lamella contacts 11 on the inner contact surfaces. The arc current then flows via the fins 10 of the movable arcing contact 6 to the lamella contacts 11 and then to the electrically conductive

[0018] Webs of the fixed contact tube 5 ( counter contact ) .

[0019] The exemplary embodiment according to Fig. 3 shows a tubular contact piece 7 with self-resilient contact fingers 8. The contact piece coaxially surrounds the moving arc contact 6 of the vacuum tube and is galvanically firmly connected to the stationary contact tube 5. It is preferably made of CuCrlZr or carbon fiber-reinforced carbon.

[0020] In the embodiment shown in Fig. 4, the movable arcing contact 6 of the vacuum tube 4 is electrically connected to the stationary contact tube 5 by a laminated contact strip 13. The laminated contact strip 13 is fixed in a ring, which is connected, for example, to the stationary contact tube 5 via webs or lugs. The sliding contact is established between the laminated contact strip 13 and the movable arcing contact 6. With this solution, the contact tube can be realized as a cast component, which is particularly economical.

[0021] The movable arc contact 6 is driven by a driver 3 and guided centrally.

[0022] The sliding contact device according to the invention may be designed for high voltage. High voltage, as defined by the invention, means a voltage of 72.5 kilovolts or higher.

[0023] The present invention has been explained in detail for illustrative purposes using specific embodiments. Elements of the individual embodiments can also be combined with one another. The invention is therefore not intended to be limited to individual embodiments, but is limited solely by the appended claims. List of reference symbols

[0024] 1 - I insulating housing

[0025] 2 - fixed contact piece, first high-voltage connection

[0026] 3 - Driver, drive

[0027] 4 - Vacuum interrupter

[0028] 5 - fixed, hollow contact tube, second high-voltage connection

[0029] 6 - axially movable arcing contact of the vacuum interrupter

[0030] 7 - tubular contact piece

[0031] 8 - self-springing contact finger

[0032] 9 - fixed arcing contact of the vacuum interrupter

[0033] 10 - electrically conductive fin

[0034] 11 - electrically conductive lamella contact

[0035] 12 - Bridges

[0036] 13 - Lamellar contact strip

[0037] I I- II - cutting plane

[0038] VV - cutting plane

Claims

Patent claims 1. Sliding contact device for contacting a movable arcing contact of a vacuum switch, characterized in that the arcing contact (6) movable along its longitudinal axis has several, in particular three, fins (10) arranged uniformly distributed around its longitudinal axis and a respective fin (10) interacts with the webs (12) of a fixed counter-contact (5) as a sliding contact.

2. Sliding contact device according to claim 1, characterized in that a web (12) is equipped with a lamella contact (11).

3. Sliding contact device for contacting a movable arcing contact of a vacuum switch, characterized in that there is an arcing contact (6) which is movable along its longitudinal axis and a fixed counter-contact (5), a tubular contact piece (7) is galvanically firmly connected to the fixed counter-contact (5), the tubular contact piece (7) itself has resilient contact fingers (8) which coaxially surround the movable arcing contact (6) in such a way that the tubular contact piece (7) and the movable arcing contact (6) interact as a sliding contact.

4. Sliding contact device according to claim 3, characterized in that the tubular contact piece (7) is made of CuCrlZr.

5. Sliding contact device according to claim 3, characterized in that the tubular contact piece (7) is made of carbon fiber reinforced carbon.

6. Sliding contact device for contacting a movable arcing contact of a vacuum switch, characterized in that an arcing contact (6) movable along its longitudinal axis and a fixed counter-contact (5) are provided, a lamellar contact band (13) is connected in a ring concentric to the longitudinal axis of the movable arcing contact (6) with the fixed counter-contact (5) in such a way that the lamellar contact band (13) and the movable arcing contact (6) interact as a sliding contact.

7. Sliding contact device according to claim 6, characterized in that the lamella contact band (13) is connected to the fixed contact tube (5) via lugs.

8. Sliding contact device according to claim 6, characterized in that the lamella contact strip (13) is arranged in a groove of the fixed contact tube (5).

9. Sliding contact device according to one of the preceding claims, characterized in that the contact tube (5) is realized as a cast component.

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