DE102017206866A1 - Connection element for a moving contact of a vacuum interrupter and gas-insulated switchgear with a connection element for a moving contact of a vacuum interrupter - Google Patents

Abstract

The invention relates to a connection element for a moving contact of a vacuum interrupter with a connection body, and a flexible power line element, wherein the connection element has at least one outer body and the connection body is connected via a flexible, heat-conducting connector with the at least one outer body and a gas-insulated switchgear with such a connection element ,

Description

The invention relates to a connection element for a moving contact of a vacuum interrupter and a gas-insulated switchgear with such a connection element.

Switchgear systems are known in the prior art which have vacuum interrupters for switching short-circuit currents. These vacuum interrupters and their switching contacts are designed to be able to switch off the high currents in the case of short-circuit currents. These short-circuit currents are in the high kilo-ampere range (>> 1 kA). The required geometry of the switching contacts has in principle a comparatively high contact resistance in the closed state of the vacuum interrupter. This high contact resistance leads during operation of the switchgear, so in a switching operation of the vacuum interrupter, especially in the area of the vacuum interrupter, due to just the contact resistances at a flowing rated current, a high power loss arises, which in the vacuum interrupter to elevated temperatures and thus leads to elevated temperatures throughout the plant. In order to enable the operation of the system, predetermined temperature limits must be observed, that is not to be exceeded, which often additional measures for cooling the switchgear, in particular the vacuum interrupter and its adjacent components are required.

In the prior art, the higher temperatures are counteracted by an increased use of conductor material, thus reducing and optimizing the electrical resistance of the conductor connection to the vacuum interrupter. Larger system housings and associated larger gas chambers are in principle suitable, in particular due to an increased heat capacity of the overall larger system and thus the amount of gas present, to lead to overall reduced temperatures of the switchgear.

However, both of these methods lead to an increased use of metallic resources and an increased demand for the respective insulating gas. However, larger amounts of insulating gas may possibly also have a negative influence on the environmental properties of the switchgear.

The object of the invention is therefore to remedy the disadvantages of the prior art.

This object is achieved by the independent claim 1 and the claims dependent therefrom.

One embodiment relates to a connection element for a moving contact of a vacuum interrupter with a connection body, and a flexible power line element, wherein the connection element has at least one outer body and the connection body is connected via a flexible, heat-conducting connecting piece with the at least one outer body.

This innovative design enables a higher rated current while maintaining the size, as the heat dissipation from the switching system is significantly improved. The heat dissipation is achieved via the use of the outer body, which is connected to the connection body at least thermally conductive. This additional heat dissipation, preferably in the region of the connection of connection body and flexible power line element, allows a further compact construction.

It is preferred that the connection body has one or more heat sinks. The one or more heat sinks allow in addition to the outer body a further increased heat dissipation from the switching system, in particular away from the vacuum switch and its electrical connection points.

It is also preferred that the one or more heat sinks have cooling ribs which preferably extend parallel to the longitudinal axis of a receiving opening for the moving contact of a vacuum interrupter of the connection body. The receiving opening can be provided, regardless of the presence of heat sinks or cooling fins on the heat sinks, with a fastening mechanism, so that the moving contact is firmly connected to the connection body. In particular, it is preferred that the moving contact of the vacuum interrupter is clamped in the receiving opening. For this purpose, the connection body is particularly preferably designed in two parts or slotted.

In particular, it is preferred that the cooling fins run on the one or more heat sinks in the mounted state parallel to the gravitational force, ie vertically, and so an optimal convection along the heat sink is achieved.

It is also preferred that the one or more heat sinks are not or partially or completely enclosed by the outer body. Depending on the chosen configuration, either improved convection in the area of the heat sinks is achieved, if they are not enclosed, or a compromise between absorption of heat radiation convection on the heat sinks with partially enclosed heat sinks, achieved, or an improved Absorption of heat radiation, fully enclosed heat sinks achieved.

It is also preferred that the one or more heat sinks are painted such that the one or more heat sinks have an increased surface area, compared to the pure geometric shape, and / or increased heat radiation, compared to a non-painted surface. In particular, it is preferred that the coating causes an increase in the surface area by at least a factor of 5, preferably by at least a factor of 10, particularly preferably by at least a factor of 100.

It is preferred that the outer body partially or completely surrounds the flexible power line element. This not only allows a better heat dissipation, but also mechanically protected the flexible power line element.

It is further preferred that the outer body is formed by a cage made of thermally conductive material. Such a cage not only improves the absorption and dissipation of heat radiation, the cage also allows convection and thus further heat dissipation.

In a particular embodiment, the flexible, heat-conducting connecting piece is designed to be electrically insulating.

It is also preferred that the heat-conducting connecting piece is designed to conduct electricity and the flexible, heat-conducting connecting piece via the outer body is conductively connected to a main current path of the connecting element. The outer body is therefore on the one hand electrically connected to the terminal body and thermally conductive and on the other hand electrically conductive and thermally conductive connected to the main current path, so that the rated current can be divided and the heating at the contact points can be reduced. At the same time an improved heat dissipation over the outer body is possible.

It is further preferred that the outer body can be connected via a further current-conducting, flexible, heat-conducting connecting piece to a main flow path of the connecting element.

It is also preferred that the flexible, heat-conducting connecting piece and / or the flexible power-conducting element have fins on the sides which increase the surface area and contribute to or cause increased heat radiation.

Another embodiment relates to a gas-insulated switchgear with at least one vacuum interrupter, wherein a moving contact of the vacuum interrupter is contacted with a connection element according to one or more of the preceding embodiments.

It is also preferred that the insulating gas comprises one or more of the following gases SF6 and / or one or more fluoroketones and / or one or more nitriles, in particular fluorinated nitriles and / or nitrogen and / or carbon dioxide and / or oxygen and / or dry air and / or one or more olefins and / or one or more oxiranes, especially fluorinated oxiranes.

It is also preferred that the heat-conducting connecting piece is designed to conduct electricity and the flexible, heat-conducting connecting piece via the outer body is conductively connected to a main current path of the connecting element. The outer body is therefore on the one hand electrically connected to the terminal body and thermally conductive and on the other hand electrically conductive and thermally conductive connected to the main current path, so that the rated current can be divided and the heating at the contact points can be reduced. At the same time an improved heat dissipation over the outer body is possible.

It is further preferred that the outer body can be connected via a further current-conducting, flexible, heat-conducting connecting piece to a main flow path of the connecting element.

In particular, it is preferred that the further current-conducting, flexible, heat-conducting connecting piece is arranged in the region of a heat-conducting ceramic bushing, so that in addition a heat dissipation via the ceramic of the ceramic bushing is possible.

• 1: Schematische Darstellung eines erfindungsgemäßen Anschlusselements;
• 2: Schematische Darstellung eines flexiblen Stromleitungselements; und
• 3: Schematische Darstellung eines aufgefächerten flexiblen Stromleitungselements.

The subject matter of the invention is explained in more detail below on the basis of figures:

• 1 : Schematic representation of a connection element according to the invention;
• 2 : Schematic representation of a flexible power line element; and
• 3 : Schematic representation of a fanned flexible power line element.

The 1 shows a schematic representation of a connection element 1 that has a flexible power line element 10 , which is connectable to a main current path of a switchgear, has. The flexible power line element 10 is with the connector body 40 electrically connected. The connection body 40 has a recording not shown 42 for a moving contact of a vacuum interrupter. Furthermore, the connection element has 1 via a flexible, heat-conducting connector 30 that the connector body 40 or with the connector body 40 connected flexible conduit element 10 with an outer body 50 thermally conductive connects.

In addition, the connection element has 1 in the example of 1 over a heat sink 20 , which conducts heat with the connection body 40 is connected and here via cooling fins 52 which is parallel to the longitudinal axis of the receiving opening 42 run. Because the receiving opening 42 at the in 1 unrecognizable underside of the connection element 1 is arranged, is the receiving opening 42 indicated by a dashed line.

The 2 shows a flexible power line element consisting of several layers 12 an electrically conductive, flexible material is constructed. The conductive, flexible material is preferably copper, aluminum, stainless steel, a conductive plastic and / or combination, in particular alloy, of said conductive, flexible materials.

The 3 shows a section of a flexible power line element 10 in which the individual layers which form the flexible power-conducting element are fanned out towards the edge.

The fanning leads to improved heat dissipation, both through improved heat dissipation and through heat dissipation to the convection on the flexible power line element 10 passing isolation gas.

LIST OF REFERENCE NUMBERS

1

connecting element

10

flexible power line element

12

Layers of the flexible power line element

14

at the edge fanned layers of flexible power line element

20

heatsink

30

flexible, heat-conducting connector

40

connection body

42

Receiving opening of the connection body for the moving contact of the vacuum interrupter

50

outer body

52

cooling fins

Claims (13)

Connection element (1) for a moving contact of a vacuum interrupter with a connection body (40), and a flexible power line element (10), characterized in that the connection element (1) has at least one outer body (50) and the connection body (40) via a flexible, thermally conductive connecting piece (30) is connected to the at least one outer body (50). Connection element (1) to Claim 1 , characterized in that the connection body (40) has one or more heat sinks (20). Connection element (1) to Claim 2 , characterized in that the one or more heat sinks (20) cooling fins (52) which extend parallel to the longitudinal axis of a receiving opening (42) for the moving contact of a vacuum interrupter of the connection body (40). Connection element (1) to Claim 2 or 3 , characterized in that the one or more heat sinks (20) are not or partially or completely enclosed by the outer body (50). Connection element (1) according to one of the preceding claims, characterized in that the one or more heat sinks (20) are painted such that the one or more heat sinks have an increased surface area and / or increased heat radiation. Connection element (1) according to one of the preceding claims, characterized in that the outer body (50) surrounds the flexible power-conducting element (10) partially or completely. Connection element (1) according to one of the preceding claims, characterized in that the outer body (50) is formed by a cage of thermally conductive material. Connection element (1) according to one of the preceding claims, characterized in that the flexible, heat-conducting connecting piece (30) is electrically insulating. Connecting element (1) according to one of Claims 1 to 7 , characterized in that the heat-conducting connecting piece (30) is designed to conduct current and the flexible, heat-conducting connecting piece (30) via the outer body (50) is conductively connected to a main current path of the connecting element (1). Connection element (1) to Claim 9 , characterized in that the outer body (50) via a further current-conducting, flexible, heat-conducting connecting piece with a main current path of the connecting element (1) is connectable. Connection element (1) according to one of the preceding claims, characterized in that the flexible, thermally conductive connector (30) and / or the flexible power conduit member (10) have fan-out sides which increase the surface area and contribute to increased heat dissipation. Gas-insulated switchgear with at least one vacuum interrupter, characterized in that a moving contact of the vacuum interrupter is contacted with a connection element (1) according to one or more of the preceding claims. Gas insulated switchgear after Claim 12 , characterized in that the insulating gas comprises one or more of the following gases SF6 and / or one or more fluoroketones and / or one or more nitriles, in particular fluorinated nitriles and / or nitrogen and / or carbon dioxide and / or oxygen and / or dry air and / or one or more olefins and / or one or more oxiranes, especially fluorinated oxiranes.

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