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

Abstract

A solution is proposed for a sliding contact device for contacting a movable arcing contact of a vacuum switch under high voltage conditions. Advantageously, the proposed solution is characterized by a low moving mass and a low transition resistance.

Description

[Technical Field]

[0001] The present invention relates to a contact of an axially movable arcing contact with a fixed hollow contact tube of a vacuum switch.

[0002] Up until now, in vacuum switches, the contact between the movable arc contact and the fixed contact tube has been achieved by a clamped socket into which a contact ring containing additional thin-plate strip contacts is screwed. If the number of contact transitions is large for structural reasons, the transition resistance becomes large, which is detrimental to the thermal durability of the vacuum switch. Furthermore, this high-mass structure must be accelerated to the required high contact speed. This increases the mechanical stress of the kinematic chain and, correspondingly, requires high drive energy.

[0003] A further known solution uses conductor wires, which are also exposed to high mechanical stresses since at high voltage levels, e.g. high voltages, higher contact speeds are required.

[0004] The invention is based on the problem of forming a contact between a movable arcing contact of a vacuum tube and a fixed contact tube of a vacuum switch in such a way that a reliable contact of the movable arcing contact is achieved with a small moving mass and a small contact resistance.

[0005] This problem is solved by a sliding contact device for contacting a movable arcing contact of a vacuum switch, which comprises the features of claims 1, 3 and 6.

[0006] Advantageously, the proposed solution is characterized by low moving mass and low transition resistance.

[0007] Advantageous further configurations of the invention are set forth in the dependent claims.

[0008] The present invention will now be described in more detail by way of example and with reference to the drawings to the extent necessary for understanding. [Brief explanation of the drawings]

[0009] [Figure 1] 1 shows a first contact according to the invention of an axially movable arcing contact of a vacuum switch; [Figure 2] 2 shows a cross-sectional view of the arrangement from FIG. 1 along section II-II. [Figure 3] 4 shows the second contact of the axially movable arcing contact of the vacuum switch according to the invention; [Figure 4] 3 shows a third contact according to the invention of an axially movable arcing contact of a vacuum switch; [Figure 5] 5 shows a cross-sectional view of the arrangement from FIG. 4 along section VV.

[0010] In the figures, like names refer to like elements.

[0011] 1, electrically conductive fins 10 (e.g., three) are attached to the movable arcing contact 6 of the vacuum tube 4, which extend into corresponding contact grooves of the counter contact. The contact grooves may, for example, be formed by two electrically conductive webs 12 in the fixed hollow contact tube 5, which are provided with electrically conductive sheet contacts 11 on their inner contact surfaces. The arc current then flows through the fins 10 of the movable arcing contact 6 to the sheet contacts 11 and then through the electrically conductive webs (counter contacts) of the fixed contact tube 5.

[0012] The embodiment according to Fig. 3 shows a tubular contact piece 7 with self-sprung contact fingers 8. The contact piece coaxially surrounds the movable arc contact 6 of the vacuum tube and is firmly galvanically connected to the fixed contact tube 5. The contact piece is preferably made of CuCr1Zr or carbon-fiber-reinforced carbon.

[0013] In the embodiment according to Fig. 4, the movable arc contact 6 of the vacuum tube 4 is electrically connected to the fixed contact tube 5 via a thin contact strip 13. Here, the thin contact strip 13 is fixed in a ring and is connected to the fixed contact tube 5, for example, via webs or lugs. A sliding contact is provided between the thin contact strip 13 and the movable arc contact 6. With this solution, the contact tube can be realized particularly economically as a cast part.

[0014] The movable arc contact 6 is driven by a power conductor 3 and is centrally guided.

[0015] The sliding contact device according to the invention can be designed for high voltages, where high voltage within the meaning of the present invention is understood to be a voltage of 72.5 kilovolts or more.

[0016] While the present invention has been described in detail with reference to specific embodiments for purposes of illustration, elements of the individual embodiments may be combined with one another. Accordingly, the present invention is not intended to be limited to the individual embodiments, but rather to be limited only by the scope of the appended claims. [Explanation of symbols]

[0017] 1...insulating housing, 2...fixed contact piece, first high-voltage connection, 3...power conductor, drive part, 4...vacuum switch, 5...fixed hollow contact tube, second high-voltage connection, 6...axially movable arc contact of vacuum switch, 7...tubular contact piece, 8...self-sprung contact finger, 9...fixed arc contact of vacuum switch, 10...conductive fin, 11...conductive thin sheet contact, 12...web, 13...thin sheet contact strip, II-II...cutting surface, VV...cutting surface

Claims

1. 1. A sliding contact device for contacting a movable arcing contact of a vacuum switch, comprising: the movable arc contact (6) has a plurality of, in particular three, fins (10) arranged along the longitudinal axis of the movable arc contact (6) and evenly distributed around said longitudinal axis, said fins (10) interacting as sliding contacts with the webs (12) of the respective fixed counter contacts (5); Sliding contact device.

2. 2. A sliding contact device according to claim 1, wherein the web (12) is provided with a thin plate contact portion (11).

3. 1. A sliding contact device for contacting a movable arcing contact of a vacuum switch, comprising: The movable arc contact (6) is provided with the movable arc contact (6) and a fixed counter contact (5) along a longitudinal axis of the movable arc contact (6), The fixed counter contact (5) and the tubular contact piece (7) are firmly connected galvanically, the tubular contact piece (7) has self-springing contact fingers (8) coaxially surrounding the movable arc contact (6), and the tubular contact piece (7) and the movable arc contact (6) interact as sliding contacts; Sliding contact device.

4. 4. A sliding contact device according to claim 3, characterized in that the tubular contact piece (7) is made from CuCr1Zr.

5. 4. A sliding contact device according to claim 3, wherein the tubular contact piece (7) is made from carbon fiber reinforced carbon.

6. 1. A sliding contact device for contacting a movable arcing contact of a vacuum switch, comprising: There is provided an arcing contact (6) movable along a longitudinal axis and a fixed counter contact (5), Concentrically with the longitudinal axis of the movable arc contact (6), a thin metal contact strip (13) is connected to the fixed counter contact (5), and the thin metal contact strip (13) and the movable arc contact (6) interact as a sliding contact. Sliding contact device.

7. 7. A sliding contact device according to claim 6, wherein the sheet contact strips (13) are connected to the stationary contact tube (5) via lugs.

8. 7. A sliding contact device according to claim 6, wherein the sheet contact strips (13) are arranged in grooves in the stationary contact tube (5).

9. 9. Sliding contact device according to any one of claims 1 to 8, characterized in that the contact tube (5) is realized as a cast part.

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