EP1928001B1 - Electrical transport conductor for overhead line - Google Patents

Abstract

The conductor has central composite rods (1A-1C) constituted of continuous carbon fibers impregnated by a matrix of thermosetting resin i.e. epoxy resin. The rods are respectively covered with layers (2A-2C) of insulating material, and conducting wires (3) made of aluminum or aluminum alloy are wound around the rods. A short-circuiting device short-circuits the fibers and the wires, and is arranged at an end of the conductor.

Description

The invention relates to an electrical transport conductor for high voltage overhead line.

It relates more specifically to a conductor comprising at least one central composite rod consisting of continuous fibers impregnated with a thermosetting resin matrix and around which are arranged conductive son of aluminum or aluminum alloy.

Such a driver is described in the patent document JP 03-129606 .

According to this document of the prior art, the composite rod consists of organic or inorganic fibers, for example aramid, silicon carbide or carbon, impregnated with a synthetic resin, preferably an epoxy resin. This ring can be coated with a polyimide resin or wrapped with a polyimide film, forming an insulating layer. Aluminum conductor wires are wrapped around such a ring or a set of such rods to form an electrical transport conductor.

In particular, the polyimide coating has the function of avoiding corrosion problems at the interface between the conductive wires and the rod comprising carbon fibers.

Given the non-zero resistivity of the carbon fibers, part of the main stream is derived from the conductive layers of aluminum or aluminum alloy son through the capacity formed by the combination of these conductive son, the insulating layer and carbon fibers. A potential difference therefore appears at the terminals of this insulating layer. This difference in potential gives rise to a potentially unacceptable electric field for the insulating layer, whatever the nature of the matrix of thermosetting material, whatever the nature and the implementation of the insulating layer and whatever the number of layers of conductive wires.

By calculation, it can be observed that the electrical voltage induced in this insulating layer is a function of the length of the conductor, the intensity of the electric current conveyed and is independent of the voltage between phases.

Since these conductors are intended to convey an electrical current of intensity that may be twice the corresponding intensity of a conventional equivalent cable, the voltage induced in the insulating coating may cause damage to it in the short or medium term.

To solve this problem, the invention proposes an electrical transport conductor in particular for overhead electrical lines and comprising at least one central composite rod consisting of continuous fibers impregnated with a thermosetting resin matrix, this rod being coated with at least one layer of insulating material and aluminum or aluminum alloy conductor wires being wound around this ring, characterized in that it comprises a device for short-circuiting said fibers and said conductive wires.

According to a preferred embodiment, said device is arranged at at least one end of the conductor.

And advantageously, said short-circuiting device is made during the manufacture of anchor sleeves or during the manufacture of in-line junctions.

By anchoring sleeve is understood the sleeve disposed on a pylon and supporting one end of the conductor. By line junction is meant a terminal junction of conductors between two pylons.

Said insulating material may be a polyether-ether-ketone.

And preferably, said insulating material is poly (oxy-1,4-phenyleneoxy-1,4-phenylene-carbonyl-1,4-phenylene).

Said insulating material may consist of at least one tape placed on said rod.

And preferably, the nature of said insulating material is fiberglass.

Said conductive son may be wound in at least one layer covering said rod coated with said insulating material.

And preferably, the conductor comprises a plurality of composite rods of which at least one is coated with a said layer of insulating material.

The conductor may comprise a plurality of composite rods contained in a said layer of insulating material.

Said conductive son diposées in layers may consist of round, trapezoidal son or Z. The shape of these conductive son may vary depending on the layer.

Said fibers are made of carbon.

The invention is described below in more detail with the aid of figures representing only preferred embodiments of the invention.

The figure 1 is a cross-sectional view of an electrical transport conductor according to the invention.

The FIGS. 2A to 2C illustrate a first embodiment of the invention.

The FIGS. 3A to 3C illustrate a second embodiment of the invention.

• la température maximale admise en régime permanent,
• la température maximale admise lors de surcharges de courtes, moyennes ou longues durées,
• la température maximale admise lors d'un court-circuit.

In the case of overhead line operators, three types of temperature are to be considered:

• the maximum permissible temperature in steady state,
• the maximum temperature allowed during overloads of short, medium or long duration,
• the maximum temperature allowed during a short circuit.

These conductors are such that the maximum permissible temperature is in the three aforementioned cases greater than or equal to 200 ° C, said temperature further operating temperature.

On the figure 1 , there is shown an electrical transport conductor in particular for overhead power lines, whose operating temperature is greater than or equal to 200 ° C. It comprises at least one central composite rod 1 consisting of fibers, continuous filaments of carbon fibers, impregnated with a matrix of thermosetting resin, preferably epoxy resin, this rod being coated with a layer of insulating material 2 and aluminum or aluminum alloy wire 3 being wound around this ring.

By a pultrusion process, the continuous fibers are impregnated with resin and then the rod formed is subjected to a heat treatment by continuous elevation of temperature.

Such a ring of mechanical reinforcement has the advantage of having a low specific weight and to accept significant mechanical stresses.

• sa contrainte mécanique à la rupture est supérieure ou égale à 2,6 G Pa,
• son allongement à la rupture est supérieur à 2 %,
• son module d'élasticité est supérieur à 90 G Pa,
• son coefficient de dilatation linéaire est inférieur à 2 10^-6 / °C,
• son poids spécifique est inférieur à 2 kg/dm³,
• son taux en poids de fibres de carbone est supérieur à 70 %,
• après vieillissement pendant 30 jours à la température de fonctionnement de 200 °C, sa contrainte mécanique à la rupture est supérieure ou égale à 2,6 G Pa et cela dans les deux cas suivants : jonc sous charge mécanique de 25 % de sa contrainte mécanique initiale et jonc sans charge mécanique,
• après enroulement de 180 ° sur un diamètre maximal de 120 fois le diamètre du jonc et ensuite soumis trois fois consécutivement à une charge mécanique de 25 % de sa charge de rupture initiale, le jonc présente une contrainte mécanique à la rupture supérieure ou égale à 2,6 G Pa.

The ring consisting of a plurality of carbon fiber continuous filaments assembled and impregnated with an epoxy resin is such that:

• its mechanical stress at break is greater than or equal to 2.6 G Pa,
• its elongation at break is greater than 2%,
• its modulus of elasticity is greater than 90 G Pa,
• its linear expansion coefficient is less than 2 10 ^-6 / ° C,
• its specific weight is less than 2 kg / dm ³ ,
• its weight ratio of carbon fibers is greater than 70%,
• after aging for 30 days at the operating temperature of 200 ° C, its mechanical stress at break is greater than or equal to 2.6 G Pa and this in the following two cases: rod under mechanical load of 25% of its mechanical stress initial and ring without mechanical load,
• after winding 180 ° over a maximum diameter of 120 times the diameter of the rod and then subjected three times consecutively to a mechanical load of 25% of its initial breaking load, the rod has a mechanical stress at break greater than or equal to 2 , 6 G Pa.

The number of composite rods used for a conductor is such that the latter passes an alternating bending test intended to demonstrate that the stresses present during unwinding under mechanical tension in the pulleys do not affect or degrade the performance of the driver.

The conductor is tensioned at 15% of its rated breaking load. This driver is installed a carriage with three pulleys placed in a vertical plane and whose axes are placed in the same horizontal plane. The distance between the end pulleys is 3200 mm ± 600 mm.

The pulleys are of the same type as those used during the unwinding of conventional conductors on the overhead lines (bottom of throat trimmed with neoprene): Diameter of the pulley at the bottom of the groove (mm) Diameter of the conductor (mm) 800 ≤ 38 1000 > 38

The carriage makes three movements back and forth, at a horizontal speed ranging from 0.5 to 2 m / s over a length of between 50 and 60 m. Acceleration and braking are smooth.

The driver and accessories assembly must hold at least 95% of the rated breaking load of the driver.

According to the illustrated example, three rods 1A, 1B, 1C are arranged centrally and are coated on the one hand with a layer of insulating material 2 and on the other hand each with another layer of insulating material 2A, 2B, 2C . Conductive son 3 of aluminum or aluminum alloy, here son trapezoidal, are wound in two layers on these rods.

According to the invention, the insulating material of the layers 2 is compatible with the operating temperature greater than or equal to 200 ° C and is placed on the rod 1 without subsequent heating.

According to a first embodiment, this insulating material is extruded on the rod 1 and consists of a polyether-ether-ketone.

Preferably, poly (oxy-1,4-phenylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene), marketed under the name Victrex PEEK, is used.

According to a second embodiment, this insulating material consists of at least one ribbon of glass fibers.

According to the invention, the conductor comprises a device for short-circuiting carbon fibers and conducting wires in aluminum or aluminum alloy, which is disposed at least one end of the conductor.

This short-circuiting device is made during the manufacture of anchor sleeves and or during the manufacture of in-line junctions.

The FIGS. 2A to 2C illustrate a first embodiment of the invention.

On the Figure 2A is shown a conductor as described above and the end of the rod 1 or rods 1A, 1B and 1C provided with their insulating layer is stripped and free of conductor son 3. This conductor end is intended to be connected to a sleeve M containing an electrical contact protection coating E. By compression of the metal jaw of the sleeve against the end of the rod 1 or rods inserted (s), as shown in Figures 2B and 2C , the latter is in electrical connection with the metal jaw of the sleeve which in turn is electrically connected to the conductor wires 3 of aluminum or aluminum alloy of the conductor.

The FIGS. 3A to 3C illustrate a second embodiment of the invention.

On the figure 3A is shown a conductor as described above and the end of the rod 1 or rods 1A, 1B and 1C provided with their insulating layer is stripped and free of conductor son 3. This conductor end is intended to be connected to a sleeve M 'containing an electrical contact protection coating E. This sleeve M' also comprises a metal contact C. By inserting the ring 1 or the rods against this contact C, as shown in FIG. figure 3B , then by compressing the metal jaw of the sleeve against the end of the rod 1 or rods inserted (s), as shown in the figure 3C , the latter is in electrical connection with the metal jaw of the sleeve which in turn is electrically connected to the conductor wires 3 of aluminum or aluminum alloy of the conductor.

Claims (10)

1. An electric transport conductor, in particular for electric overhead lines, and including at least one central composite ring (1) consisting of continuous carbon fibers impregnated with a thermosetting resin matrix, this ring being coated with at least one layer of insulating material (2), and of conducting wires in aluminium or in an aluminium alloy (3) wound around this ring, characterized in that it includes a device for short-circuiting said fibers and said conducting wires (3).
2. The conductor according to the preceding claim, characterized in that said device is positioned at at least one end of the conductor.
3. The conductor according to the preceding claim, characterized in that said short-circuiting device is made while making anchoring sleeves and/or while making of the line junctions.
4. The conductor according to the preceding claims, characterized in that said insulating material is a poly-ether-ether ketone.
5. The conductor according to the preceding claim, characterized in that said insulating material is poly(oxy-1,4-phenylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene).
6. The conductor according to any of claims 1 to 3, characterized in that said insulating material consists of at least one strip laid on said ring (1).
7. The conductor according to the preceding claim, characterized in that the nature of said insulating material is glass fiber.
8. The conductor according to the preceding claims, characterized in that said conducting wires (3) are wound in at least one layer covering said ring (1) coated with said insulating material.
9. The conductor according to the preceding claim, characterized in that it includes several composite rings (1A, 1B, 1C), at least one of which is coated with said layer of insulating material (2A, 2B, 2C).
10. The conductor according to claim 8 or 9, characterized in that it includes several composite rings (1A, 1B, 1C) contained in a so-called layer of insulating material (2).

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