Abstract: A method of manufacturing a high-voltage electrical insulator (1), having at least one metal insulator element (4, 6) cemented to a dielectric insulator element (2) by a cement mortar (5), includes at least one of the following steps: preparing the cement mortar (5) from aluminous cement and sand that are mixed with at least water; assembling the dielectric element (2) with the metal element (4, 6), the mortar (5) being placed between the dielectric insulator element (2) and the metal element (4, 6); and vibrating the dielectric element (2) and the metal element (4, 6) as assembled together, so as to distribute the mortar (5) between the dielectric element and the metal element (2, 4, 6). In order to prepare the mortar (5), an active ingredient of the polymer superplasticizer type based on polyglycol methacrylic acid ester is added, and the vibrating is performed for a duration lying in the range 2 seconds to 20 seconds, and preferably in the range 4 seconds to 15 seconds.

Abstract: The method of manufacturing a high-voltage electrical insulator (1), comprising at least one metal insulator element (4, 6) cemented to a dielectric insulator element (2) by means of a cement mortar (5), comprises at least one of the following steps: preparing the cement mortar (5) from aluminous cement and sand that are mixed with at least water; assembling the dielectric element (2) with the metal element (4, 6), the mortar (5) being placed between the dielectric insulator element (2) and the metal element (4, 6); and vibrating the dielectric element (2) and the metal element (4, 6) as assembled together, so as to distribute the mortar (5) between the dielectric element and the metal element (2, 4, 6). In order to prepare the mortar (5), an active ingredient of the polymer superplasticizer type based on polyglycol methacrylic acid ester is added, and the vibrating is performed for a duration lying in the range 2 seconds to 20 seconds, and preferably in the range 4 seconds to 15 seconds.

Abstract: The method of fabricating a very high, high, or medium voltage composite insulator (1) comprises an insulating core (2) made of glass fiber reinforced synthetic material based on a mixture of a resin having epoxy groups, and a covering (3) made of an elastomer material surrounding said core (2), said elastomer material being selected from silicone, ethylene propylene diene monomer (EPDM) and mixtures thereof, and vulcanizing at a vulcanization temperature higher than 130° C.

Abstract: A method of fabricating a composite insulator with a protective housing made of a polymer material incorporating an antioxidant and an antiozonant includes the step consisting in incorporating said antiozonant at a final concentration by weight lying in the range 0.005% to 1%, and said antioxidant at a final concentration by weight lying in the range 0.005% to 1%, said antiozonant being selected from the family of phenylenediamines, and said antioxidant being selected from the family of multifunctional phenolic antioxidants.

Abstract: A method of fabricating a composite insulator with a protective housing made of a polymer material incorporating an antioxidant and an antiozonant includes the step consisting in incorporating said antiozonant at a final concentration by weight lying in the range 0.005% to 1%, and said antioxidant at a final concentration by weight lying in the range 0.005% to 1%, said antiozonant being selected from the family of phenylenediamines, and said antioxidant being selected from the family of multifunctional phenolic antioxidants.

Abstract: The method of manufacturing a composite insulator constituted by a rod surrounded by an insulating coating and provided at its two ends with two metal end fittings respectively consists in the following steps: fixing two respective metal interfaces to the two ends of the rod, the metal end fittings of the insulator subsequently being fixed to the interfaces; and putting the coating into place around the rod and around the metal interfaces while leaving an end portion of each metal interface uncovered by the coating so as to enable the metal end fittings to be fixed thereto subsequently.

Abstract: A composite electrical insulator comprises a support rod generally of a composite material, two metal end-fittings each forming a socket in which a corresponding end of the support rod is inserted, at least one optical fiber placed on the outer periphery of the support rod, and an insulating outer coating surrounding the support rod and covering the optical fiber which has at least one end guided to the outside of the insulator through an end-fitting via a groove formed in the inside surface of the socket of the end-fitting, said groove opening to the outer periphery of the support rod, and via a duct extending said groove and opening to the outside of the end-fitting.

Abstract: The method of manufacturing a composite insulator constituted by a rod surrounded by an insulating coating and provided at its two ends with two metal end fittings respectively consists in the following steps:

Abstract: The composite electrical insulator comprises an integrated optical fiber sensor placed inside the insulator. The integrated sensor can be a fault sensor constituted by an optical fiber placed on the support rod of the insulator and having optical cladding that melts at a temperature which is critical for the insulator. The integrated sensor can be a sensor for measuring stresses of mechanical or thermal origin acting on the insulator while it is in operation. It is constituted by an optical fiber having a Bragg grating implanted therein. The Bragg grating is placed on the support rod of the insulator or on a metal end-fitting of the insulator.

Abstract: A composite electrical insulator comprises a support rod generally of a composite material, two metal end-fittings each forming a socket in which a corresponding end of the support rod is inserted, at least one optical fiber placed on the outer periphery of the support rod, and an insulating outer coating surrounding the support rod and covering the optical fiber which has at least one end guided to the outside of the insulator through an end-fitting via a groove formed in the inside surface of the socket of the end-fitting, said groove opening to the outer periphery of the support rod, and via a duct extending said groove and opening to the outside of the end-fitting.

Abstract: A composite electrical insulator comprises a support rod generally of a composite material, at least one optical fiber placed on the outer periphery of the support rod, and an outer insulating coating of a vulcanized material surrounding the support rod so as to cover the optical fiber. The optical fiber has an outer sheath of a material that is compatible with the material constituting the outer coating so that a cohesive bond forms between the outer sheath of the optical fiber and the outer coating of the insulator while the outer coating is being vulcanized.

Abstract: The composite electrical insulator comprises an integrated optical fiber sensor placed inside the insulator. The integrated sensor can be a fault sensor constituted by an optical fiber placed on the support rod of the insulator and having optical cladding that melts at a temperature which is critical for the insulator. The integrated sensor can be a sensor for measuring stresses of mechanical or thermal origin acting on the insulator while it is in operation. It is constituted by an optical fiber having a Bragg grating implanted therein. The Bragg grating is placed on the support rod of the insulator or on a metal end-fitting of the insulator.

Abstract: The lightning arrester assembly for an overhead line for transporting electricity comprises a lightning arrester connected in series with a horned spark-gap between the electricity transport line and a support structure in the form of an arm of a pylon connected to ground. The assembly also includes a device for flagging a malfunction of the lightning arrester, which device is connected in series with the lightning arrester on one of the horns of the spark-gap.

Abstract: The electrical insulator includes a laminated tube serving as a support for a covering of elastomer material constituting a plurality of annular fins which project from the tube. Two circular grooves and a helical groove are formed in the outside wall of the tube for receiving the optical waveguide. The circular grooves are parts of bearing surfaces which are formed at the ends of the tube and to which end fittings of the insulator are secured. The optical waveguide is embedded in the elastomer material and at the bottoms of the grooves.

Abstract: A device for detecting and indicating a fault current flowing through a lightning arrestor or an insulator, the current being DC or at AC mains frequency, the device being housed inside a box that is provided with a frangible window and that has a piece of metal electrically connected to an end fitting of the lightning arrestor or of the insulator passing therethrough. The device has: a transformer for transforming the current, the primary of the transformer being constituted by the piece of metal, and the secondary of the transformer being connected to a peak-limiting circuit to make pulses of current due to surges corresponding, in particular, to lightning strikes inoperative; a heating resistance fed by said transformer and constituting an igniter for a pyrotechnic composition in which it is embedded, the composition being designed to break the frangible window; and preferably indicator means suitable for being released by rupture of the frangible window.

Abstract: A composite insulator (30) comprises a central rod (32) of fibers embedded in a synthetic resin with each end of the rod being fixed to a respective metal end-fitting (31) by a metal sleeve coupling (34) and with the side wall of the rod having a coating (36) of elastomer fins molded thereover. The coating covers the side walls (37) of the end-fittings (31) so as to leave uncovered only those portions (35) which are required for attaching the insulator.

Abstract: A sealed envelope based on a filamentary winding constituted by resin-impregnated glass fibers, for equipment likely to be subjected to large thermal stresses and thus to be the seat of internal excess pressures, the winding adhering to the outside surface of the equipment, wherein the outside surface of the equipment coated with the winding has fiber-free zones forming resin-filled gaps, with the percentage of the surface area not covered with fibers being not less than about 15%.

Abstract: A rigid electrical insulator of the type having a base or a pin at its bottom and having at least one groove (18 or 19) for receiving an electrical cable at its top, the insulator being characterized by the fact that it includes at least one central rod (1) fixed at its bottom end to the base (5) or to the pin and at its top end to a rigid head (7) provided with at least one channel (8 or 9), the outside faces of the rod and of the rigid head (7) being covered in waterproof manner by a covering (10), with the head covering being of a flexible elastomer and the rod covering being selected from elastomers, resins, and varnishes, the groove (18 or 19) being defined by the channel (8 or 9) covered by its covering.