JPS5922444B2 - Spacing retainer for gas-insulated high-voltage cables - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to provide a spacer for gas-insulated high-voltage cables consisting of a grounded outer corrugated tube and an electrically conductive conductor centrally disposed within the corrugated tube.

Even if the cable length is virtually endless, spacing cages can be provided without interfering with production speed and at the same time preventing the movement of broken parts, e.g. broken parts that can move in the direction of the cable in the event of an impact. For this purpose, the spacer consists of at least two structural elements assembled into a complete disk on the conductor.

When assembled, this structural element is fixed in position on the conductor perpendicular to the axis.

A spacer of this kind is fitted from the front onto the inner conductor and fixed there during the formation of the outer tube, before the outer tube is closed and then corrugated.

Furthermore, the disc structure also prevents shocks (and thus the movement of such breakage parts that may occur in the pipe or during operation).

The components of the spacer are assembled so that they are integrated into the disc and fixed to the inner conductor at the same time.

The fixing to the inner conductor is carried out, for example, by means of grooves in the joining surfaces of the parts; this fixing also prevents axial movement of the spacer, which is essential for problem-free production. That's true.

When manufacturing gas-insulated high-voltage cables of this type with spaced spacers, this problem arises when the outer tube is formed over the spacers and then corrugated.

That is, the outer tube surrounding the spacer is corrugated in order to create the necessary flexibility, and the corrugation has to be shallower or deeper depending on the diameter of the tube, in which case the corrugation It must be ensured that the bottom of the spacer is pressed radially onto the spacer so that no damage occurs due to the applied force.

During corrugation, the corrugation disk pushes the corrugation deeper than the desired inner diameter of the corrugated tube.

In this way, when the corrugated disk is removed, the desired inner diameter is finally obtained, since the pressed corrugations return slightly due to their elasticity after forming.

For example, if a spacer made of a relatively soft material such as polyethylene or Teflon is used, no problem arises.

The reason is that such materials flex during corrugation and therefore do not break.

The problem of the present invention is to
An object of the present invention is to make it possible to fix a spacer to an outer cylindrical pipe without any problems.

This object is achieved by the present invention in the gas-insulated high-voltage cable in the following manner.

The spacer is provided with an elastic body on its outer surface facing the outer tube.

The task of this elastomer is to absorb the deformation forces that occur during corrugation; it fixes the position of the spacer in the outer tube, while at the same time ensuring that the bottom of the waves that occur during corrugation is Helps prevent damage to the spacer.

In a further embodiment of the invention, it is advantageous to manufacture the elastic body from the material forming the spacer.

A particularly advantageous embodiment is for the elastic body to be part of the spacer.

Suitable materials for the spacer include, for example, polycarbonate, polysulfone or polyphenyl oxide.

The elastic body is provided around the outer periphery of the spacer, which is purposely formed on a disc, to prevent the influence of the electric field.

The invention will be explained in detail with reference to the spacer shown in the drawings.

The inner conductor 1 of a gas-insulated high-voltage cable consisting of a tube or conductors connected to one another is held by a spacer 3 inside a corrugated outer tube 2 .

The outer periphery of this member has a thicker ring, one end of which forms a hinge, the lower end in the figure, while the other end is shown with e.g. serrations as a means of joining the two parts together. Q is provided so that the two hinged members can be tightened.

The radial cross-section of this member is generally T-shaped, and the lower end of this T-shape is enlarged at its engagement with the inner conductor.

This spacer 3 is composed of two parts which are connected in a complementary manner and assembled into a complete disk.

This member is immovably fixed to the conductor 1 by assembling it at right angles to the axial direction of the cable.

The inner chamber between the inner conductor 1 and the outer tube 2 is filled with an insulating gas, for example S
It is filled with F.

When manufacturing cables of this type, a suitable metal band is formed into a tube around the inner conductor 1 provided with the spacer 3, and the edges of the band are welded to provide the necessary flexibility during installation. Finally, it is wave-shaped to obtain the desired character.

The spacer surface facing the outer tube 2 and the outer side are such that the corrugation base, which presses radially during corrugation, does not damage the spacer 3, which is elastic within a given range but is itself solid. An elastic body 5 is provided between the tube 2 and the tube 2.

The elastic body 5 extends tangentially to the circumferential surface of said ring of the spacer and is able to interact radially elastically with the outer tube.

This elastic body absorbs excess forces during corrugation due to its elastic action, so that pressing forces acting in the radial direction do not damage or break the spacer.

The elastic force of the elastic body 5 can be adapted to the requirements required of the cable by varying the thickness and length of the elastic body.

[Brief explanation of the drawing]

The drawing is a front view showing an embodiment of the present invention. 1...Inner conductor, 2...Outer tube, total
...Spacer holder, 4...Outer surface of spacer holder, 5...Elastic body.

Claims (1)

[Claims] 1. In a gas-insulated high-voltage cable having a grounded outer corrugated tube and a conductor provided centrally within the corrugated tube, a spacer for retaining the conductor within the corrugated tube and keeping the conductor spaced apart, the spacing retainer comprising: comprising two members each having a semicircular structure, means for combining these members to form a disk, and a plurality of integrally constructed elastic bodies on the outer circumferential surface of the disk facing the corrugated tube; A gas insulated type characterized in that the elastic body extends in a tangential direction and touches the corrugated pipe elastically in a radial direction when engaging with it, and the member engages with the conductor. High voltage cable spacing retainer.