DE7323367U - Conductor expansion point of an encapsulated high-voltage line - Google Patents

Description

SIEMENSAKTIENGESELLSCHAPT Erlangen? ^ ⁰¹¹¹ '"'"

G? Berlin and Munich Werner-von-Siemens-Str.

Our reference: VPA 73/3133 Kna / Hln

LeJ terexpansionsstelle of an encapsulated high voltage line

The invention relates to a conductor expansion point of an encapsulated High-voltage line with two rigid conductor sections in the axial direction by means of an intermediate piece are movably and electrically connected.

Such conductor expansion points are used in encapsulated high-voltage lines to compensate for axial shifts in length of the current-carrying conductors caused by temperature fluctuations needed. For example, from US Pat. No. 3,391,243 there are essentially two different solutions to compensate such shifts in length are known. One solution uses one to connect two rigid conductor sections firmly clamped flexible piece of cable. With very high currents, e.g. 3-5 kA, and longer transmission distances, However, in which the individual conductor sections have lengths of approximately 10 m and more, the axial displacements are so large that they can no longer be absorbed by stretching or bending individual pieces of cable. Also the second solution, the slots in the electrical conductor used, and thus only individual points deg electrical Making the conductor more flexible is not suitable for compensating for greater length shifts.

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Another, commercially available solution to compensate for axial Displacements in an encapsulated high-voltage line uses undulating bulges to compensate for the longitudinal displacements. As in the application of future encapsulated high-voltage lines in addition to the transmission of large currents also on the use of very high voltages, for example 380 kV and more, is intended, this solution cannot be used either because the spacing between the conductor and the jacket is reduced by the intermediate bellows.

The task is to find a conductor expansion point for an encapsulated high-voltage line that can also be used at the highest Current and voltage stress of the line is able to absorb length shifts of the conductor, as well as with larger distances between the post insulators deflection of the conductor sections equalize at the junction.

The object is achieved with a conductor expansion point of the type mentioned at the outset in that the intermediate piece also is rigid and firmly attached to the first conductor section, that the intermediate piece via an axially displaceable plug connection is electrically conductively connected to the second conductor section, and that the plug housing part of the plug connection is mechanically connected to the second conductor section via a hinge. By using an aohsial movable Plug-in connection, it is initially possible to compensate for larger linear expansions or shrinkages. Because the ladder If the spacing between the post insulators is also more pronounced, their axes will be at the connection point form an angle with each other. The joint between the connector housing part the plug connection and the second conductor section ensures that between the intermediate piece and the plug connection no tilting occurs, and thus the abrasion during the movement of the intermediate piece can remain minimal Seizing of any parts rubbing against each other is due to the compensation of angular tolerances by means of the joint excluded. The related security requirements can thus be complied with.

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Preferably, the joint will be a ball joint, in which a spherical segment-shaped bulge around the connector housing part is mounted in a corresponding, spherical-shell-shaped recess of the second head section. This Ball joint allows both vertical compensation due to bending of the individual conductor sections as well horizontal compensation due to positional and manufacturing tolerances. The spherical shell-shaped bearing is the same above In addition, any combination of these errors is similar to a double cardanic joint.

In the case of a conductor expansion point with tubular conductors, a transition piece can be welded onto each conductor section be, by means of which the inner diameter of the conductor sections is decreased; the one transition piece on the first conductor section can be a disk on which the intermediate piece is firmly attached; the other transition piece on the second conductor section can be ring-shaped and with a spherical shell-shaped Be provided recess on its inside; in this transition piece, the connector housing part can by means of a spherical section-shaped bulge, and the joint can be closed by a push ring, the is attached to the transition piece and which also has a spherical shell-shaped bulge on the inside, which which complements the transition piece to a complete bearing shell «This embodiment offers a particularly advantageous one and easy to manufacture implementation of the ball joint.

It is advantageous if contact springs are fitted in grooves in the connector housing part. Between the connector housing part and pressure ring, copper cables can be attached. The electrically conductive connection between the second conductor section and the intermediate piece is thus via spring contacts of the plug housing, Ki ^ heel ropes between connector housing part and pressure ring » Pressure ring and transition piece made. This version shape offers a safe current transfer at the axially movable point between the intermediate piece and the conductor

A-

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section. The use of copper ropes makes a solid

• The specified current path is observed, which prevents the formation of creep atroin because of largely reduced. In another advantageous

stick embodiment can instead of the copper ropes Federj contacts mounted in grooves in the spherical bearing shell ; be over which an electrically conductive connection directly; made between connector housing part and transition piece will.

A shielding sleeve will preferably shield the conductor expansion point at least in the area of the intermediate piece. Lie Abj shield sleeve will advantageously be firmly attached to one conductor section and axially to the other conductor section slidably rest on an insulating piece from the outside. The Ab-

• The shield sleeve can be screwed onto one section of the conductor

; be. The shielding sleeve prevents large field strengths from occurring in the area of the ladder expansion point. This makes it possible to have a largely potential-free space within the shield sleeve, which prevents the formation of corona effects on small radii of curvature. Additionally any abrasion is kept within the potential-free space and cannot get into the space between Exit conductor and jacket.

The invention is explained below by way of example with reference to the drawing.

The drawing shows a longitudinal section through the conductor expansion point. There are initially two sections 1, 2 of a tubular conductor of an encapsulated high-voltage line, for example a fully encapsulated, SF ^ -isolated pipeline. To simplify the illustration, the outer jacket around this pipe conductor and the representation of support points are omitted. An intermediate piece 3 connects the two Pipeline 1, 2 both electrically and mechanically. A transition piece 21 is in the form of the first conductor section welded to a disc. The intermediate piece 3 is about a

3efestigungaflansch 22, by means of screws 23 with this over-

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gangway piece firmly connected - the surfaces of the transition piece 21 and des. Mounting flange 22 are when using aluminum for the transition piece at their point of contact spray-copper-plated to achieve a good electrical transition. Ladder sections 1, 2, intermediate piece 3 »transition piece 21 and mounting flange 22 are concentric to one another in the relieved state.

In this example, the intermediate piece 3 is a rigid, tubular one Conductor made of very abrasion-resistant and electrically conductive material, such as the one under the name Sigmadur is commercially available. Sigmadur is a copper alloy.

A transition piece 11 is also welded to the second conductor section 1. This transition piece 11 is ring-shaped formed, with a spherical shell-shaped recess 111 is provided on its inside. In this spherical shell-shaped recess 111, a spherical segment-shaped bulge is supported 33 of the connector housing part 31. This spherical segment-shaped Bulge, in the center of which the connector housing part 31 is located, can be directly together with the connector housing part manufactured, or manufactured separately and later applied to the connector housing part. To complete the bearing shell 111, 121, is a pressure ring 12 by means of screws 14 screwed onto the transition piece 11. This pressure ring also has a spherical shell-shaped bulge on the inside 121, which supplements that of the transition piece 11 to form a complete bearing shell 11 "^ 121.

To produce an electrically conductive connection between the intermediate piece 3 and the second conductor section 1, aas intermediate piece inserted into the connector housing part 31, on the inside of which annular spring contacts 32 are attached in annular grooves. These pedals can be made of beryllium bronze, for example. To continue the current are between, the spherical segment-shaped bulge 33 and the pressure ring 12 ν Copper ropes 34 attached. These copper ropes can for example be soldered in. They are evenly around the circumference of the

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t · · »■

I It · ·

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Pressure ring 12 distributed. The surfaces of Druokring 12 and Transition piece 11 are spray copper-plated at their contact points when using aluminum for the transition piece. In a further embodiment variant, the copper cables 34 could be omitted, and spring contacts in their place similar to the one in the Steoker housing detail on the inside dfts ball shell bearing 111 of the transition piece 11 attached be. In this way, electrical contact would be made directly between the connector housing part 31, 33 and the transition piece 11 be made.

To prevent the occurrence of large field strengths in the area of the conductor expansion points, a shielding sleeve 4 or similar is electrical conductive material provided. This shielding sleeve 4 is fixed to the one conductor section via a screw connection 41 1 connected. It rests against the other conductor section in an aciisially displaceable manner via an insulating ring 42 from the outside.

Claims (9)

“Troubles 1. Ladder expansion point of an encapsulated high-voltage line in the case of the two rigid ladder sections, movable and electrical in an axial direction by means of an intermediate piece are conductively connected, characterized in that the intermediate piece (3) is also rigid and attached to the first Head section (2) is firmly attached that the intermediate piece via an axially displaceable plug connection (31,32) is electrically connected to the second conductor section (1), and that the plug housing part (31,33) of the plug connection is mechanically connected to the second conductor section via a joint (11, 12, 33). 2. conductor expansion point according to claim 1, characterized in that that the joint (11, 12, 33) is a ball joint in which a spherical segment-shaped bulge (33) is ring around the connector housing part (31, 33) in a corresponding, spherical shell-shaped recess (111, 121) of the second Head section (1) is stored. 3. conductor expansion point according to claim 1 or 2 with tubular conductors, characterized in that on the conductor sections (1, 2) a transition piece (11, 21) is welded on each, by means of which the inner diameter of the conductor sections is reduced that the transition piece (21) on the first conductor section (2) is a disk on which the intermediate piece (3) is firmly attached that the other transition piece (11) is ring-shaped on the second conductor section (1) is, with a spherical shell-shaped recess (111) on its inside that in this transition piece (11) the Connector housing part (31, 33) by means of a spherical segment-shaped Bulge (33) is mounted and that this joint is closed by a pressure ring (12) which is attached to is attached to the transition piece (11) and which also has a spherical shell-shaped bulge (121) on the inside 7323367 04/03/75 -θ - VFA 73/3133 which complements that of the transition piece to form a complete bearing shell (111, 121). 4. Ladder expansion atelle according to one of claims 1 to 3, characterized in that contact springs (32) are fitted in grooves in the plug housing part (31, 33). 5. conductor expansion point according to claim 4, characterized in that that copper cables (34) are attached between the connector housing part (31, 33) and the pressure ring (12). 6. conductor expansion point according to claim 4, characterized in that that spring contacts are mounted in grooves of the spherical shell-shaped bearing shell (111), via which one electrically conductive connection is established directly between the connector housing part (31, 33) and transition piece (11). 7. conductor expansion point according to one of claims 1 to 6, characterized in that a shielding sleeve (4) is the conductor expansion point shields at least in the area of the intermediate piece (3). 8. conductor expansion point according to claim 7, characterized in that that the shielding sleeve (4) is firmly attached to one conductor section (1) and to the other Conductor section (2) is axially displaceable from the outside via an insulating ring (42). 9. conductor expansion point according to claim 8, characterized in that that the shielding sleeve (4) is screwed onto one conductor section (1). 7323367 O3.et.75