IE970700A1

IE970700A1 - Marker ball and its installation method for high-voltage¹overhead cables.

Info

Publication number: IE970700A1
Application number: IE970700A
Authority: IE
Inventors: Tuomas Antikainen; Harri Turunen
Original assignee: Sekko Ab Oy
Priority date: 1996-10-03
Filing date: 1997-09-26
Publication date: 1998-04-08
Also published as: FI100925B; PL322404A1; SE9703547L; CZ310397A3; FI963955A0; SE9703547D0; NO974571L; GB9720943D0; NO974571D0; GB2317998A; SE512271C2

Abstract

The invention relates to a marker ball and its installation method for high-voltage overhead cables. In the installation method of the invention, the cable is first fitted with an intermediate bearing (8) which is then fitted with half-balls (1,2). As the mounting is carried out by using an intermediate bearing cross-wise to the cable, the installer has a better access to the attachment points, neither one of which is located on the opposite side of the ball from the installer.<Fig.1>

Description

Marker ball and its installation method for high-voltage overhead cables The present invention relates to a marker ball for hicn5 voltage overhead cables, the ball consisting of half-tails with the rims thereof placed against each other, said ball being provided with clamps for securing the ball to a cable or wire.

The invention relates also to a method for installing a marker ball on the lightning conductor of a high-voltage overhead cable, in which method the installation is performed manually from a carriage running along the cable by securing two half-balls against each other.

Such marker balls are installed on the lightning wires of high-voltage overhead cables e.g. for the reason that the cables are detected more readily from aircraft.

In current solutions, the marker balls are secured to a cable by means of clamps which are set on either side of the ball adjacent to the lead-in of the cable. Thus, the installation and attachment will be inconvenient due to the large ball diameter. The installation is carried out manually from a carriage running along the cable and, hence, both clamps must be secured from the same side of the ball and the installer must reach over on the opposite side of the ball.

An object of the invention is to provide a marker ball and its installation method, which facilitates and expedites the installation of a marker ball from a carriage.

This object is achieved by means of a marker ball as set forth in the annexed claim 1 and by means of an installation method as set forth in claim 6. The non-independent claims disclose preferred embodiments of the invention.

The invention -will now be described in more detail with reference made to the accompanying drawings, in which fig. 1 shows a marker ball of the invention in a section perpendicular to a cable; fig. 2 shows the marker ball in a side view; fig. 3 shows a rubber bushing to be installed on a marker ball at the lead-in of a cable in an end and a side view; fig. 4 shows in a larger scale a coupling between a cable and ball clamping elements seen in the direction of the cable; and fig. 5 shows in a larger scale a coupling between an intermediate bearing used for the mounting and a ball.

The ball to be installed on the lightning conductor of a high-voltage overhead cable consists of two halves 1, 2 with rims 3, 4 placed against each other. In the fixedly secured ball, a division plane 5 between the halves 1, 2 will coincide with a vertical plane which is parallel to a cable 6.

An intermediate bearing 8 used for the mounting is secured transversely relative to the cable 6 by means of a clamp, including jaws 14, 15 for securing the cable 6 therebetween by the tightening of clamping screws 16. At the same time, the screws 16 clamp the intermediate bearing 8 between a beam 17 and the jaw element 15. The beam 17 is provided with threaded holes for the screws 16. The flatshaped intermediate bearing 8 is retained between two adjacent clamping screws 16.

When the transverse intermediate bearing 8 has been mounted on the cable 6, the half-balls 1, 2 will be secured to the ends of the intermediate bearing 8. For this purerse, the ends of the intermediate bearing 8 are bended ir.tr vertical attachment lugs 9 provided with holes for fastening bolts 10. The fastening bolts 10 are welded securely to the lugs 9. Instead of the bolt 10 it is possible ro use a threaded plug, which is securelt attached to the holeless lug 9. The half-balls 1, 2 are provided at the attachment points thereof with cup-shaped inwardly directed recesses 11, 12, to whose bottoms the attachment lugs 9 of the intermediate bearing 8 are secured. Since the balls, with respect to the size thereof, are made of a relatively thin plastic material, the attachment poinrs at the bottom of the recesses 11, 12 are provided with sizable washers 13, which are secured with a suitable adhesive to the half-balls. Since the bolt 10 or the threaded plug and the washer 13 are previously secured, the installer need not hold loose components.

By virtue of the design and installation method of a call of the invention, the attachment can be performed manually from one side of the ball without having to reach over on the opposite side of the ball in the direction of a cable.

Claims

1. A marker ball for high-voltage overhead cables, the ball consisting of half-balls (1, 2) with rims (3, 4) thereof placed against each other, said ball being provided with clamps for securing the ball to a cable (6), characterized in that the clamps include an intermediate bearing (8) mounted transversely to the cable (6), and the half-balls (1, 2) are secured to the ends of the intermediate bearing (8).

2. A marker ball as set forth in claim 1, characterized in that the half-balls (1, 2) include therebetween a division plane (5) in the vertical direction and the intermediate bearing (8) is perpendicular to the division plane (5).

3. A marker ball as set forth in claim 1 or 2, characterized in that the ends of the intermediate bearing (8) are provided with bent vertical attachment lugs (9).

4. A marker ball as set forth in any of claims 1-3, characterized in that the half-balls (1 , 2) are provided with cup-shaped recesses (11, 12) for securing the attachment ends (9) of the intermediate bearing (8) thereto. 5. A marker ball as set forth in any of claims 1-4, characterized in that the cable lead-ins included in the ball are fitted with rubber bushings (18). 6. A method for installing a marker ball on the lightning conductor of a high-voltage overhead cable, in which method the installation is performed manually from a carriage running along the cable by securing two halfballs (1, 2) against each other, character970700 i z e d in that the cable is first fitted with a crosswise intermediate bearing (8) which is thereafter frtrei with the half-balls (1, 2).

5. 7. A method as set forth in claim 6, characterized in that the half-balls (1, 2) are secured in such a position that a division plane (5) therebetween sets rn a substantially vertical plane which is parallel to the cable.