FR2563386A2 - Anchoring extension piece for an electrical line - Google Patents

Abstract

a. Anchoring extension piece for an electrical line, intended to be fixed, on the one hand, to the fittings of an anchoring support and, on the other hand, to the conductor of the line. b. It is characterised in that it is made from an insulating material, especially polycarbonate. c. The invention applies to the protection of electrical poles from overloads.

Description

Anchor extension for power line
The present improvement relates to an anchoring extension for an electrical line intended to be fixed on the one hand to the fittings of an anchoring support and on the other hand to the conductor of the line.

 The anchoring of an electric line on the fittings of an anchoring support is currently done by means of the following elements, going from the conductor to the fittings anchoring sleeve, chain of insulators, anchoring extension.

 These elements are sized according to the constraints to which they must be subjected. However, especially under the effect of snow or frost, these constraints are likely to increase extremely rapidly and to a large extent exceed the maximum constraints for which the anchoring elements have been dimensioned. This increase in the forces exerted by the conductors can have serious consequences such as deterioration or even rupture of the anchoring supports. This damage, in addition to serious financial consequences, can even deprive entire regions of electricity for long hours.

 The main patent aims to remedy these drawbacks by proposing an extension for safety anchoring which can almost lower. instantly the force to which the poles or other electrical line support are subjected, when this force becomes too great and approaches the value F for which there is a risk of breaking the pole.

 For this purpose, the anchoring extension according to the main patent, is characterized in that it consists of a p-first element comprising at one of its ends a first fixing device intended to receive the fittings, d a second element com-8rtant at one of its ends opposite the end of the first element carrying the first fixing device, a second fixing device intended to receive the fittings, the second element being capable of moving relative to the first element in a direction corresponding to the maximum stresses, as well as a locking device keeping the second element in a first position relative to the first element when the stress exerted by the conductor on the anchoring extension is less than a value of threshold FO, itself lower than the value F for which there is a risk of rupture of the support, and breaking when this constraint reaches or exceeds the threshold value to cause the s this element towards a second position relative to the first.

 According to another characteristic of the main patent, the first element consists of a hollow cylinder in which moves a piston mounted on a rod which constitutes the second element.

 The purpose of this improvement is to improve the characteristics of the anchoring extension described above, by incorporating into it the function normally fulfilled by the chain of insulators.

 To this end, the present improvement relates to an anchoring extension of the above type, characterized in that it is made of an insulating material.

 This material can be chosen from a wide range of materials currently offered on the market, particularly advantageous results have been obtained using polycarbonate.

 According to another characteristic of the present improvement, the hollow cylinder comprises, on its external surface, one or more thicknesses, the shape and dimensions of which are chosen so as to obtain, along this surface, a line of flight of sufficient length to maintain the insulation between the support fitting and the conductor in the event of an overvoltage.

 Again, several configurations are possible without departing from the scope of the invention.

 According to a particularly advantageous characteristic of the invention, the excess thickness (es) are constituted by conical fins, in particular two identical fins provided with ribs on their internal face.

 The characteristics of the anchor extension which is the subject of this improvement will be described in more detail with reference to the appended drawing, in which the various elements corresponding to the main patent bear the same references, and are not described below. below in more detail for the sake of brevity.

 According to this figure, the hollow cylinder 1 is made of an insulating material, in particular polycarbonate and comprises, on its external surface, two identical conical fins 13 and 13 ′ provided with ribs 14 on their internal face 15.

 The role of these fins 13, 13 ′ is to obtain, on the external surface of the cylinder 1, a creepage distance of sufficient length to maintain the insulation between the support fitting and the conductor in the event of overvoltage.

 Therefore, the role of the fins 13, 13 ′ is to fulfill one of the functions of the chain of insulators (length of the creepage line, the insulation function under the nominal voltage of the line being fulfilled by the insulating materials constituting the product).

 Of course, the configuration shown in the figure should only be considered as an example, and is in no way limitative of the present improvement.

Claims (5)

 10) Anchoring extension for electric line intended to be fixed on the one hand to the fittings of an anchoring support and on the other hand to the conductor of the line, consisting of a first element (1) comprising, at one of its ends (2), a first fixing device (3) intended to receive the fittings or the chain of insulators, of a second element (6, 7) comprising, at one of its opposite ends at the end (2) of the first element (1) carrying the fixing device (3), a second fixing device (8) intended to receive the fittings, the second element (6, 7) being able to move by relative to the first element (1), as well as a locking device (10, 11, 12) holding the second element (6,  7) in a first position relative to the first element (1) when the stress exerted by the conductor on the anchor extension is less than a threshold value Fo and breaking when this constraint reaches or exceeds the threshold value to cause the second element (6, 7) to a second position relative to the first, the first (1) and the second element (6, 7) operating in a similar manner to a damper while the locking device (10, 11 , 12) provides security against overloads, and the first element (1) consisting of a hollow cylinder (1) in which a piston (7) moves mounted on a rod (6) which constitutes the second element, according to the main patent, anchoring extension characterized in that the hollow cylinder (1) is made of an insulating material, in particular polyearbonate.  20) Anchoring extension according to claim 1, characterized in that the hollow cylinder (I) comprises on its external surface, one or more thickeners (13, 13 ') whose shape and dimensions are chosen so as to obtain, along this surface, a trailing line of sufficient length to maintain the insulation between the support fitting and the conductor in the event of an overvoltage.  30) Anchoring extension according to claim 2, characterized in that the or the extra thicknesses are conical fins.  4) Anchoring extension according to any one of claims 2 to 4, characterized in that it comprises several identical extra thicknesses.  50) Anchoring extension according to any one of claims 2 to 4, characterized in that it comprises two identical extra thicknesses.  60) Anchoring extension according to any one of claims 2 to 5, characterized in that the extra thicknesses (13, 13 ') are provided with ribs (14) on their internal face (15).