DE202009015602U1 - Self-lubricating current sliding contact - Google Patents

Abstract

Contact blade arrangement (4, 40, 400) of a nominal power connection of a gas-insulated high-voltage circuit breaker (1) with at least one contact blade (8, 80, 800) and at least one mating contact (9) in the plug-in direction (12) extending mating jaws (10a, 10b), characterized in that the contact blade has a plurality of contact fingers, which in a transversely to the indexing axis and in the direction of insertion (12) extending, lamellar cross-section two leading away from a pivot spring sections, wherein a first end portion of a first spring portion in the retracted state of Contact blade (8, 80, 800) in the mating contact the mating jaws (10a, 10b) touched such that a second contact force F2 at the second end portion in the ratio of the length ratios of the first spring portion to the second spring portion according to the lever law to a first contact force F1 of the first spring portion stands.

Description

TECHNICAL AREA

The Invention relates to the field of high voltage circuit breakers, in particular the electrical contacting of the circuit breaker am Phase conductor when installing the switch in its switching chamber housing.

STATE OF THE ART

typical High-voltage circuit breakers are simply cylindrical structures with two ends, which within a switching chamber housing on their phase rail contacts a gas-insulated switchgear hanging attached become. This is a remote from a drive of the circuit breaker, first end of the switch plugged into a kind of contact socket, which electrically over attached the corresponding phase rail to a first insulator is. The drive facing the second end of the switch has at its periphery a contact blade arrangement, which in the closed, electrically conductive state of the circuit breaker power over a a second insulator mounted, ensures appropriate phase rail. This electrical contact at the second end of the switch is only after the weird Introduce of the switch in the contact socket by a movement across Switching axis reached.

PRESENTATION OF THE INVENTION

at a known system, the contact blade assembly consists of a Contact blade with a seen in the direction of the switching axis approximately rectangular Cross-section, which in a counter-shaped counter-contact with U-shaped Cross-section transversely to the indexing axis in a plug-in direction retractable is. Such a contact blade arrangement requires on the one hand the Maintaining relatively tight Form and position tolerances and precision of the contact blade and of the mating contact.

It It is therefore an object of the invention to provide a contact blade assembly to submit, which despite improved tolerance in terms of shape and Location yet a sufficient high power transmission guaranteed.

These The object is achieved by a contact blade arrangement according to the protection claim 1 solved by the contact blade has contact fingers which are shaped in this way are that they by their geometry one transverse to the direction of insertion Apply spring force, which reliably ensures the achievement of the required contact forces. Such a contact blade arrangement is suitable for transmission of rated currents Kiloampère area, for example, about 5 kA. The contact can be in one direction slide along the busbar without the power transmission impaired becomes. To the electrical contact of the circuit breaker to ensure the phase rail the contact is pluggable perpendicular to the sliding direction.

By the symmetrical structure can be the contact for all currents, the be required, be expanded as desired.

The Invention idea is that the attached force F1 over a Fulcrum, subsequently also support 1 called, reinforced becomes. Thus, that is in the support point 2 applied force around the ratio I1 / I2 bigger. To improve the power line, copper alloys are used. If necessary, the power transmission with a silver coating in addition improvable.

Of the technical advantage of such a contact blade arrangement consists in that the manufacturing or positioning tolerances of the contact blade perpendicular to the plug and the sliding direction with minimal influence on the contact force can be. In addition, due to the self-resilient property of the geometry the contact blade or its contact fingers an additional Spring element or spring module accounts for what the economy additionally elevated. This can be used to existing designs of material and processing costs be reduced to the production of the contact, which leads to cost advantages.

such Contact blade arrangement are likely to be particular can be used as rated current contacts in high-voltage switches.

BRIEF DESCRIPTION OF THE DRAWINGS

following becomes an embodiment the invention explained in detail with reference to the drawing. in this connection shows purely schematically

1 a longitudinal section through a gas-insulated high-voltage system;

2 a detailed view of a contact blade assembly;

3 seen in the direction of the switching axis, a cross section of a contact finger of a first embodiment of a contact blade arrangement;

4 seen in the direction of the switching axis, a cross section of a contact finger of a second embodiment of a contact blade arrangement; and

5 seen in the direction of the switching axis, a cross section of a contact finger of a third embodiment of a contact blade arrangement.

The used in the drawings and their meaning are summarized in the list of reference numerals. Same reference numerals denote geometrically identical and / or functionally identical parts. The described embodiments are exemplary for the subject invention and have no limiting effect.

WAY FOR CARRYING OUT THE INVENTION

At the in 1 shown gas-insulated switchgear 1 is the circuit breaker 6 , below also simplifying switch 6 called, as a cylindrical structure with two ends, which within a switching chamber housing 2 attached to their phase rail contacts the gas-insulated switchgear hanging, shown. In this case, a drive M of the circuit breaker facing away from the first end of the switch 5 plugged into a kind of contact socket, which electrically via the corresponding phase rail to a first insulator 3a is attached. The drive facing the second end of the switch has at its periphery a contact blade arrangement 4 on, which in the closed, electrically conductive state of the circuit breaker 6 the power over one on a second insulator 3b fixed, corresponding phase rail ensures. This electrical contact at the second end of the switch is only after the oblique insertion of the switch 6 at a low angle 7 in the direction of the switching axis (X) and the resulting contact at the first end 5 accomplished. This is done by raising the second end of the switch 6 on its drive side, so the low angle 7 is eliminated again. By the lifting movement, the contact fingers of the blade contact 8th in the so-called plug-in direction 12 (in the direction of Z) transverse to the indexing axis in the contact jaws 10a . 10b of the mating contact 9 introduced. The lateral centering (in direction Y) of the switch in the region of the contact blade arrangement is effected by the switch side arranged contact jaws 10a . 10b ,

at Need is natural conceivable that the mating contact the insulator and the contact blade associated with the switch.

The 2 shows a detailed view of such a contact blade assembly 4 and shows that the contact knife 8th has a plurality of contact fingers.

In conjunction with the 2 , comes from 3 which schematically shows a first embodiment of a contact finger in cross-section, that is to say seen in the plane YZ, shows that the contact fingers have essentially two spring sections and an intermediate pivot point.

Since the sum of the torques must be zero, the following conditions apply: M 1 = M 2 → F 1 × I 1 = F 2 × I 2 → F 2 = F 1 × I 1 / I 2

To compensate for manufacturing tolerances, a large finger length I1 can be selected. However, this will reduce the maximum force F1 that can be applied without plastically deforming the finger material. About the bracing between the two support points support 1 and 2 can be achieved with the lever law a contact force multiplication. The contact force F2 is:

The contact force in the fulcrum (support 1) is calculated as: F D = F 1 + F 2

There the distance between supports 1 and support 2 also very short can be, are high contact forces achievable without plastically deforming the material.

Unlike the contact finger of the first embodiment, the length and the shape of the end portion of the in 4 shown contact finger of the contact blade 80 chosen such that a particularly simple production of the contact blade 80 and thus the contact blade assembly 40 is reachable.

As in the third embodiment of the contact blade assembly 400 to 5 As can be seen, the support 1 at the pivot point, if necessary, via another finger of the contact blade 800 respectively. For this example, two fingers 801 . 802 arranged on a circular line and the current transfer capability can be adjusted with the number of fingers attached in parallel on a land. If the web length is limited, several webs can be arranged in parallel.

1

gas-insulated switchgear

2

Switching chamber housing

3a, 3b

Post insulators the phase rails

4, 40, 400

Contact blade assembly at the first end of the switch

5

first End of the switch

6

Circuit breakers, switch

7

angle

8th

contact blade

9

countercontact

10a, 10b

Contact baking

11

displacement direction in the direction of the switching axis

12

plug-in direction of the contact blade

Claims (4)

Contact blade arrangement ( 4 . 40 . 400 ) of a nominal power connection of a gas-insulated high-voltage circuit breaker ( 1 ) with at least one contact blade ( 8th . 80 . 800 ) as well as at least one mating contact ( 9 ) with in the insertion direction ( 12 ) running counter-jaws ( 10a . 10b ), characterized in that the contact blade has a plurality of contact fingers, which in a transverse to the switching axis and in the direction of the plug-in direction ( 12 ) extending, lamellar cross-section two leading away from a fulcrum spring portions, wherein a first end portion of a first spring portion in the retracted state of the contact blade ( 8th . 80 . 800 ) in the mating contact the counter-jaws ( 10a . 10b ) is so touched that a second contact force F2 at the second end portion is in the ratio of the aspect ratios of the first spring portion to the second spring portion according to the lever law to a first contact force F1 of the first spring portion. Contact blade arrangement according to claim 1, characterized in that the contact blade ( 800 ) several fingers ( 801 . 802 ), wherein the fingers ( 801 . 802 ) are preferably arranged mirror-symmetrically to one another in such a way so that they mutually support one another at the pivot point. Contact blade arrangement according to claim 1 or 2, characterized characterized in that the power transmission capability the contact blade assembly by means of the number in parallel on a Bridge attached fingers is selectable. Gas-insulated switchgear with at least one nominal power connection of a gas-insulated high-voltage circuit-breaker ( 1 ) comprising a contact blade arrangement according to one of claims 1 to 3.