Telescopic isolating switch

Details Telescopic isolating switch Telescopic isolating switch

1984-12-19

1986-02-04

Marcus, Stephen

Electricity: circuit makers and breakers

High-potential type

Rotating and pivoted

343901, H01H 3100

Patent

active

045688087

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a telescopic isolating switch for connecting equipment to an overhead conductor.
Various sorts of isolating switch are known comprising a plurality of tubular conductor members nested inside one another and enabling a fixed contact carried on an overhead conductor to be reached (closed position) or to be kept at a distance (open position), depending on whether the nested tubes are in a deployed position or in a retracted position.
The present invention is related more particularly to the manner in which the various tubular conductors are mechanically driven to enable the isolating switch to pass, when operated, from the switch open position when the conductors are practically completely nested inside one another, to the switch closed position when they are nearly end-to-end.
Some prior art isolating switches use a rigid insulating rod which is inserted from the base through an isulating support into the nested conductor members, and is fixed to the top of the last member which has the contact point, the rod is pushed or pulled by a motor which is placed at ground potential for deploying or retracting the tubular members. These switches have the drawback of an insulating support which is necessarily hollow, thus running the risk of internal arcing due to condensation water. Other isolator switches avoid this risk by having a flexible insulating rod which is bent out through the base of the last telescopic member above the insulating support which is solid. This flexible rod runs the risk of buckling when it is pushed up inside the telescopic members and it must be laterally guided which leads to an increased number of moving parts inside the telescopic members. It must also be rolled up outside the telescopic members when they are retracted which considerably increases the ground space taken up by the isolating switch.
The aim of the present invention is a telescopic isolating switch which can be mounted on a solid insulating support that does not run the risk of arcing due to condensation water and which has a simple mechanism which is housed inside the telescopic members for the most part and which takes up little ground space.
The present invention provides a telescopic isolator switch made up of nestable tubular members comprising a base member connected to an electrical connection point, intermediate members, and an end member bearing an electrical contact. Each intermediate member of the isolating switch contains two pulley wheels, one fixed close to each end thereof, and an endless loop passing over the two pulley wheels inside the member and attached at two diametrically opposite points to the ends of the two adjacent members. Mechanical means displace the intermediate member adjacent to the base member.
These mechanical means advantageously comprise a gear system which drives one of the pulley wheels of the intermediate member adjacent to the base member, and which slidably engages a rotary fluted shaft which is fixed inside the base member parallel to one of its generator lines.
In a variant, the mechanical means may be formed by a hollow screw and nut system.
In a preferred embodiment, the nestable tubular members of the isolator switch are each provided with a socket at their ends pointing towards the base member. The socket of each intermediate member supports a length of rod which is placed inside the corresponding member and which has the pulley wheels fixed to the ends thereof. The socket of the base member and the sockets of each intermediate member that is not adjacent to the end member also support respective posts placed inside the corresponding member and which is attached at its other end to the endless loop of the adjacent member next closer to the end member. The sockets of the end member and of the intermediate members are attached to the endless loop of the adjacent member next closer to the base member.
The endless loops are preferably made of chain.
The deployment and retraction mechanism made in this way has very few sliding parts, with the major

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