DD155273A1 - SWITCH CONTACT, ESPECIALLY FOR HIGH VOLTAGE RUNNERS - Google Patents

Abstract

The invention relates to the field of switching devices of high voltage engineering. The aim and the object of the invention is to provide improved contact ratios e.g. in the event of a short circuit, by creating the constructive conditions for a low electromagnetic centerline spacing. Essential to the invention, this is achieved in that the busbars at least on a part of their length without distance with a support element lesser Leitfaehigkeit and at least on a part of their length at a distance and isolated over defined movable connecting elements are connected to an additional support element.

Description

Berlin, II.II.I98O TRO 4572 So / Hr

Inventor:

Oh, that, Walter

Ing. Paul, Fritz 'Dipl.-Ing. , Schaller, Werner Dipl. ~ Jur.-Ing. , Sobek, Gunter

applicant:

TEB Transformatorenwerk "Karl Liebknecht" Patent Department 1160 Berlin-Oberschöneweide Wilhelminenhofstr. 83-85

Title of the invention:

Switching contact, in particular for high-voltage isolators

Field of use:

The invention can be applied to switching devices in high voltage transmission systems, e.g. be applied to separators.

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Characteristic of the known technical solutions:

Contacts of disconnectors must meet high demands in terms of current carrying capacity and Funktionssioherheit. Of particular importance here is the short circuit case with its resulting from him additional mechanical KrafteinfKissen.

To be able to counteract these influences, it is known to exploit electrodynamic effects so that the forces caused by the short-circuit current press the movable contact blade against a stop and thus prevent both the opening of the contacts, as well as with appropriate training of the attachment points, additional contact contact points form. (DE-OS 2 409 527). The disadvantage of this technical teaching is the fact that the additional contact points are effective only after the contact touch and structure of the required contact force, but this is an assignment of the switching arm under the influence of the electrodynamic

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Forces necessary. Because of the relationships between mass and acceleration of the switching arm, the formation of effective additional contact points is not timely when the surge short-circuit current occurs, d »h», at the maximum current load,

In an improved manner DD-PS 137508 teaches the utilization of current forces from a contact by double-sided power supply, whereby the additional forces are independent of the engagement position of the mating contact. The limit of the additional forces effective in this construction is given by the limitation of the smallest possible center distance between the centers (thermal dimensioning). The requirement for minimum conductor center distances and thus for very high contact forces, however, requires high moments of resistance which here leads to a

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enlargement of the magnetically effective conductor center distance and thus leads to the reduction of the magnetic additional forces. , ,

Aim of the invention;

The aim of the invention is to achieve the highest possible additional forces in the event of a short circuit in the event of a short circuit in the case of old contacts of HV equipment with the least possible time delay.

Presentation ; the essence of the invention;

According to this aim, the object of the invention is to design a switching contact, for example, for disconnectors for the transmission of high short-circuit currents, in such a way that the electromagnetic center distance can be kept as small as possible while achieving a "large" resistance moment with two current-carrying partial conductors.

According to the invention, this object is achieved in that paarvjeise resiliently arranged, flowed through by the same part of the flow contact rails are guided on a part of their length at a small distance, whereby it comes between them in current flow to form large magnetic forces. In order to harness these forces at the contact points of the sliding contacts, they must be effective there quickly and in full size. In principle, one must equip the sub-conductors with a high resistance moment in order to keep the elastic deformation within narrow limits. This condition only allows a small sub-conductor distance. , ,

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However, the dimensioning of the conductors according to mechanical stress leads to the increase of their decisive for magnetic effects center distance and thus to reduce the intended effect. According to the invention, therefore, a separation of the punctures "power line" and "mechanical strength" made by each sub-conductor is firmly connected on its side facing away from the other sub-conductor with a support element of low electrical conductivity. Thus, a minimum conductor center distance is obtained in an effective manner, which is also mechanically sufficiently supported to absorb the forces resulting from short-circuit currents can. Furthermore, it is advantageous to arrange further supports that act over the entire partial length of the separator, which are insulated and guided at a certain distance from the partial conductors. Their connection with the sub-conductors is such that a certain displacement against each other is possible in order not to hinder the suspension strong, but their distance remains virtually unchanged, so that they contribute to the stiffening of the sub-conductors.

The inventive technical teaching, the transmission of high surge short circuit currents using large electromagnetically generated contact forces is possible because the masses to be accelerated 'are low and thus after a short time the additional forces on the contact take effect. As a result, fewer contact points are needed than would be required by the prior art.

To further improve the behavior in short-circuit current transmission, the number of contact points of each sub-conductor in the region of the contact point by Auffiede-tion is increased. The length

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the pinned slots are determined by the bending moment of the magnetic forces between the tongues. The bending caused by current forces must not lead to the mutual contact of the tongues and thus to the loss of mobility.

Embodiment;

The invention will be explained in more detail below using an exemplary embodiment. Reference is made to the accompanying drawing, which represents an embodiment of the switching contact. Thereafter, the switching contact 1 reaches the busbars 2 in the closed position in its contact position. By the minimum conductor center distance - m - very high electromagnetic contact forces are generated, which allow by the support according to the invention on the support element with lower conductivity and isolated over defined movable connecting elements 5 at a distance held support elements 4 no adverse deformation.

Claims (1)

Invention 8ansρr uch Switching contact for Ho chspannungstrenner consisting of a rigid busbar and "sprung busbar pairs, both optionally associated with fixed or moving parts of switching devices, characterized in that the paired resiliently arranged, flowed through by the same part streams busbars, at least over part of their length without spacing with a support element of lower conductivity and at least part of its length at a distance and isolated over defined movable connecting elements are connected to an additional support element, and are feathered in the area of the contact engagement in a conventional manner, For this: 1 sheet of drawings