CN1178352C - Connection elements with insulating sheath of solid material - Google Patents

Abstract

The invention relates to a connection element with an insulating sheath of solid material for use in gas-insulated switchgear with metal enclosures, in particular for establishing electrical connections between components of medium-voltage switchgear, comprising a Conductive pathways between insulating contacts. The solid material insulating sleeve (FU) of the connection element (VE) is made of a thermally conductive cast resin material and is thermally connected to a plurality of cooling elements (KK...) which are connected to The outer contour of the insulating sleeve matches. The connecting element is used in gas-insulated switchgear with a metal enclosure, preferably in medium-voltage switchgear, for the supply and distribution of energy.

Description

Connection elements with insulating sheath of solid material

technical field

The invention relates to a connection element with an insulating sheath of solid material for use in gas-insulated switchgear with metal enclosures, in particular for establishing electrical connections between components of medium-voltage switchgear, comprising a Insulated contact channels between.

Background technique

The coupling piece that connects the various components arranged in the isolated gas insulated switchgear is a busbar device, which is disclosed in the German patent document DE 4001909A1. The connected busbars have pin levers at their ends, which can be plugged into corresponding sockets of the coupling element, so that an electrically conductive connection is established between the switching devices. Each coupling part leads out of the gas-insulated region of the switching device via a so-called contact channel. The coupling itself is actually a gas-tight connecting element between the switchgears, which is insulated from the outside.

Furthermore, DE 19737429 A also discloses an electrical coupling for a gas-insulated workspace, which is not itself a gas-tight connection element. In this case, the gas-insulated working area is connected in a gas-tight manner to the housing of an electrical contact channel, which is adapted to the vessel wall of the corresponding switchgear. Regardless of sealing, electrically conductive coupling parts must have a larger cross-sectional shape because they are electrically loaded.

Contents of the invention

The technical problem to be solved by the present invention is to provide a connecting element with an insulating sleeve of solid material, which has the advantages of the two known coupling elements, has a simple and compact structure, and at the same time has a greater current load under the same structure ability.

Solution of the present invention has following characteristics:

1.1 The solid material insulating sleeve of the connecting element is made of a thermally conductive cast resin material,

1.2 The solid material insulation sleeve of the connection element is connected to a plurality of cooling elements through heat conduction, and the cooling elements match the outer contour of the insulation sleeve.

By using a thermally conductive casting resin for the solid material insulating sheath for the connection element, heat can be dissipated to the surroundings and thus have a higher current carrying capacity for the same size of the conductive parts. The essence of the invention is the additional use of cooling elements with which the heat can be dissipated more quickly and intensively from the area subjected to the current load.

Given the constant demand to reduce the structural volume of such switching devices and to make the individual components of the switching device more compact, it is instead possible to minimize the structural volume of the connecting elements while maintaining the same current carrying capacity.

A kind of advantageous structure of the present invention has following characteristics:

2.1 The cooling element consists of a single cooling element in the shape of a half-shell,

2.2 said half-shell individual cooling elements are detachably connected together in pairs by bolted connections,

2.3 The half-shell individual cooling elements are designed with a structural modulus that is assigned to the components of the switchgear.

Designing the cooling element as a single cooling element in the shape of a half-shell allows for a smooth assembly of the connecting element at virtually any assembly stage. In addition, the detachable screw connections that secure the individual cooling elements together in pairs prevent costly maintenance procedures, such as replacing damaged individual parts. The individual cooling elements have a constructional modulus corresponding to the switchgear components, which on the one hand enables a standardized construction of the connection elements themselves and on the other hand allows the use of other components, such as current and/or voltage converters, if required to replace a single cooling element. Furthermore, the cooling element ensures a sufficient cooling effect irrespective of its horizontal or vertical mounting position.

Another advantageous structure of the present invention has the following characteristics:

3.1 said connecting element has a peg-shaped cross-sectional profile and is equipped with a first lug and a second lug in steps on its free end located outside the insulating sheath of solid material,

3.2 The first lug is connected to the terminal body of the gas-insulated contact channel by bolt connection,

3.3 The second lug is conductively connected to a part of the switchgear by another screw connection.

The connection element adopts a peg-shaped cross-sectional profile, and its free end located outside the solid material insulating sleeve transitions stepwise into the first and second lugs, thereby forming a connection element that is easy to manufacture, and its connection with the contact channel The body and other components are easily electrically connected via detachable screw connections.

Another advantageous structure of the present invention has the following characteristics:

4.1 The components of the switchgear described are realized via a busbar connection.

The relatively high heat losses that occur in this structure can be dissipated quickly and smoothly via the connecting element.

Description of drawings

The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. The accompanying drawing 1 is a three-dimensional exploded view showing the combination of the connecting element and the contact channel.

Detailed ways

The connecting element VE has at its two free ends a first and a second flat lug AS1 and AS2 respectively, which are not covered by a solid-material insulating sheath FU. In addition, the connection body AT of the contact-conducting channel KD can also be seen in the figure, which can be electrically conductively connected to the first lug AS1 of the connection element VE via a schematically indicated detachable connection. The cover plate AB forms, in a known manner not shown, part of a gas-tight welded container, also not shown. The contact channel KD also seals the container gas-tight using the known channel housing DA in combination with the pressure action of the pressure spring DF on the pressure ring DR. In addition, in this exemplary embodiment, the cooling element consisting of two separate cooling elements KK1 and KK2 in the assembled state covers the connection element VE in the area of the conduction channel housing DA and covers the connection element VE due to the current load. The heat is conducted to the outside world via the thermally conductive solid material insulation sleeve FU.

Furthermore, as shown, the cylindrical cross-section of the connection element VE directly connected to the second lug AS2 is covered by another cooling element, which consists of separate cooling elements KK3 and KK4, so that the heat dissipation in the area of the connection element VE Actually double.

In particular, as shown in the fourth independent cooling element KK4, the independent cooling elements KK3 and KK4 fixed together by bolted SV basically surround the middle area of the solid material insulating sleeve FU and play a role of heat conduction, so that effective heat transfer. Due to the flexible arrangement of the cooling elements on the connecting element VE, these cooling elements can also be replaced if necessary by other components which can conduct heat in the same way.

Claims (4)

1. A connection element with a solid material insulating sheath for metal-encapsulated gas-insulated switchgear, comprising an insulated contact-conducting path between gas-insulated containers, characterized in that The solid material insulating sleeve (FU) of the connection element (VE) is made of a thermally conductive cast resin material, The solid material insulating sleeve (FU) of the connection element (VE) is thermally connected to a plurality of cooling elements (KK . . . ), which conform to the outer contour of the insulating sleeve. 2. Connecting element with an insulating sheath of solid material for metal-encapsulated gas-insulated switchgear according to claim 1, characterized in that The cooling elements (KK...) are formed by half-shell-shaped individual cooling elements (KK 1, 2, n), said half-shell individual cooling elements (KK 1, 2, n) are detachably connected to each other in pairs by means of bolt connections (SV), The half-shell-shaped individual cooling elements (KK 1, 2, n) are designed with a structural module that is assigned to the components of the switchgear. 3. Connection element with a solid material insulating sheath for metal-encapsulated gas-insulated switchgear as claimed in claim 1 or 2, characterized in that, The connection element (VE) has a peg-shaped cross-sectional profile and is equipped on its free end outside the solid material insulating sleeve (FU) in a stepped manner with a first lug (AS 1) and a second lug (AS 1). Lug (AS 2), The first lug (AS 1) is connected to the terminal body of the gas-insulated contacting conductive channel by a screw connection, The second lug (AS 2) is electrically conductively connected to a part of the switching device via a further screw connection. 4. Connecting element with a solid material insulating sleeve for metal-encapsulated gas-insulated switchgear according to claim 3, characterized in that, The components of the switchgear are implemented via a busbar connection.

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