Abstract: A high-voltage alternate current (HVAC) electric cable for power transmission or distribution in under-ground power lines has a reduced capacitance obtained by reducing the density of the insulating layer.

Abstract: A wet mateable connection assembly includes: at least one first and a second watertight case mateable to each other in a watertight manner, the first and the second case having respective first and second gates at respective first and second coupling ends; at least one first phase connector arranged inside the first case; and at least one second phase connector arranged inside the second case, wherein the first gate is movable inwardly to the second case.

Abstract: A modular system for the connection of an external communication network to a user network of a building includes: a user module including: a passage opening of a connection cable of the user network including optical fibers associated with respective users and adapters associated with respective optical fibers of the connection cable of the user network, and an operator module including: an inlet opening of at least one connection cable to the external communication network including optical fibers and an outlet opening of fiber optic connection elements connected to the external communication network and provided with a connector at a terminal end thereof. The user module and the operator module are structurally independent from each other and the external communication network is operatively associated with the user network by means of a connection of the connectors of the fiber optic connection elements with respective selected adapters of the user module.

Abstract: An electrical power transmission line includes: at least one electrical cable; a raceway made of ferromagnetic material including a base and a cover defining an inner housing space for housing the electrical cable; a wet basic filling material having a pH between 11 and 13 housed in the inner housing space and embedding the at least one electrical cable. In order to achieve corrosion protection of the raceway, the inner surface of the cover is in contact with a basic passivating material having a pH between 11 and 13.

Abstract: A partial discharge detection system including a partial discharge acquisition and processing device includes: a partial discharge detection device configured to provide a detected partial discharge electrical signal from partial discharge pulse generated by a first electrical object; and a first communication module configured to receive a detected synchronization signal carrying detected synchronization phase values and corresponding reference time values associated with an electrical supplying voltage of a second electrical object. The partial discharge detection system further includes: a phase value generator configured to produce synthetized phase values representing a synthetized synchronization signal, the phase value generator being adjustable according to phase errors; and an error computing module configured to compute said phase errors from the synthetized phase values, the detected synchronization phase values and the corresponding reference time values.

Abstract: An optical fiber unit for air-blown installations includes a number of optical conductors, a first layer of resin material, a second layer of resin material radially outer to the first layer of resin material and a sheath of a thermoplastic material, wherein the second layer of resin material has a secant modulus higher than a secant modulus of the first layer of resin material and wherein the sheath of thermoplastic material is over and in close contact with the second layer of resin material.

Abstract: An energy cable includes, at least one cable core including an electric conductor, a crosslinked electrically insulating layer, and zeolite particles placed in the cable core. The zeolite particles are able to extract and absorb, very efficiently and irreversibly, the by-products deriving from the cross-linking reaction, so as to avoid space charge accumulation in the insulating material during cable lifespan. A method for extracting crosslinking by-products from a cross-linked electrically insulating layer of an energy cable core, which includes manufacturing the energy cable core containing zeolite particles, heating the energy cable core up to a temperature causing migration of the crosslinking by-products from the crosslinked electrically insulating layer; and then placing a metal screen around the energy cable core.

Abstract: An optical fiber unit for air-blown installations includes a plurality of optical fiber sub-units and a central member, wherein the optical fiber sub-units are stranded around the central member; wherein each of the optical fiber sub-units includes a number of optical fibers, an inner layer which is radially outer to the optical fibers, and an outer layer which is radially outer to the inner layer, wherein the outer layer includes particulate material which is partially embedded into the outer layer; and wherein the optical fiber unit further includes a binder for keeping the stranded optical fiber sub-units in a proper arrangement.

Abstract: An armored cable for transporting an alternate current at a maximum allowable working conductor temperature includes: at least two cores stranded together according to a core stranding lay and a core stranding pitch A; and an armor surrounding the at least two cores, the armor including one layer of a plurality of metal wires wound around the cores according to a helical armor winding lay and an armor winding pitch B, the helical armor winding lay having the same direction as the core stranding lay, the armor winding pitch B being from 0.4A to 2.5A and differing from the core stranding pitch A by at least 10%.

Abstract: A method for installing an optical fiber unit in a protective tube housing a pulling rope includes the steps of: providing a mini tube having a longitudinal opening from end to end; transversally inserting a portion of the pulling rope in the longitudinal opening; contacting the pulling rope and optical fiber unit over a predetermined length; slipping the mini tube over at least a portion of the contacting length of the pulling rope and optical fiber unit; crimping the mini tube around the pulling rope and optical fiber unit; and drawing the optical fiber unit through the protective tube by pulling the pulling rope.

Abstract: A flexible electrical cable that is resistant to external chemical agents includes a sheathing assembly and a core assembly. From interior to exterior, the core assembly has at least two conductors and a two-part filler material with an inner portion and an outer portion. The inner portion has discrete, non-continuous elements, and the outer portion is a solid, continuous material surrounding the inner portion and at least partially embedding the at least two conductors. The outer portion has a circular cross-section. The sheathing assembly has a foamed polymeric material formed around and shaped by the outer portion of the filler material, a metal tape positioned around and shaped by the foamed polymeric material, a polymeric coating surrounding the metal tape, and an outer sheath.

Abstract: A method of manufacturing an optical fibre preform comprising: providing a glass core rod comprising a central core region of radius a and an inner clad region of external radius b to define a first core-to-clad ratio a/b; forming an intermediate glass preform comprising an intermediate clad region surrounding the inner clad region of the glass rod and having an external radius c to define a second core-to-clad ratio a/c, and overcladding the intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre preform, wherein the first core-to-clad ratio a/b is equal to or less than 0.40 and the second core-to-clad ratio a/c is of from 0.20 to 0.25.

Abstract: The present disclosure relates to an impact resistant, multipolar power cable (10) comprising, a plurality of cores (1), each core (1) comprising at least one conductive element (3) and an electrical insulating layer (5) in a position radially external to the at least one conductive element (3). The cores (1) are stranded together so as to form an assembled element providing a plurality of interstitial zones (2). An expanded polymeric filler (6) fills the interstitial zones (2) between the plurality of cores (1). An expanded impact resistant layer (7) is in a position radially external to the expanded polymeric filler (6) and comprises a polymer that differs from the expanded polymeric filler (6).

Abstract: A method for monitoring a torsional state of a cable having a central longitudinal axis, includes providing a cable including a torsion sensor longitudinally extending along the cable, the torsion sensor including a single-mode optical fiber arranged substantially along the central longitudinal axis of the cable, and at least three longitudinal structural elements, at least one of the longitudinal structural elements being an electrically conductive core, wherein the torsion sensor is mechanically coupled with at least one of the longitudinal structural elements; measuring a torsional state of the single-mode optical fiber by polarization-sensitive optical reflectometry; and associating the torsional state of the cable along the longitudinal axis with the measured torsional state of the single-mode optical fiber.

Abstract: An optical cable includes an optical core and an external sheath surrounding the optical core. The external sheath includes a first material having a first, higher fracture toughness and a second material having a second, lower fracture toughness. The first and second materials are arranged so that the second, lower fracture toughness material is accessible from outside the cable along at least one longitudinally extending area of the sheath outer surface. For accessing the optical core of the cable, a short longitudinal cut, namely, few centimetres, is made with a blade in the accessible second, lower fracture toughness material. Then, its cut edges are pulled apart by hand. The pulling force causes the lower fracture toughness material to fracture, thereby propagating the initial short cut longitudinally along the sheath through its whole thickness.

Abstract: An optical termination assembly may include an optical termination box and a drop cable. The drop cable may have a first end housed in a first compartment of the optical termination box. The first end of the drop cable may be pre-connectorized. The optical termination box may include at least one first fixing element accessible from an outside of the optical termination box suitable for fixing the optical termination box to a support structure. An optical termination assembly may include an optical termination box and a drop cable including a plurality of optical fibers. The drop cable may have a first end housed in a first compartment of the optical termination box. At the first end of the drop cable, each of the plurality of optical fibers may be connected to a respective optical connector. The optical termination box may include the at least one first fixing element.

Abstract: A method for making a splice between optical fibers in a joint device suitable for housing the joint between a first electrical cable includes a first optical fiber and a second electrical cable including a second optical fiber. The joint device includes a sleeve having a cylindrical portion. The method includes (i) splicing the first optical fiber and the second optical fiber so as to form the splice and (ii) winding at least a portion of the excess length of the first optical fiber and at least a portion of the excess length of the second optical fiber around the cylindrical portion of the sleeve in a helix substantially coaxial with the cylindrical portion.

Abstract: A method of measuring the length of an electric cable, includes providing an electric cable having a cable length and including a cable neutral axis, and a fiber unit longitudinally extending along the cable and including an optical fiber arranged substantially along the neutral axis, wherein the optical fiber is mechanically coupled with the cable; injecting an optical signal into the optical fiber; detecting back-scattered light from the optical fiber responsive to the injected optical signal; analyzing the detected back-scattered light as a function of time so as to determine the length of the optical fiber, and deriving the cable length from the length of the optical fiber.

Abstract: An optical cable includes an optical core and sheath enclosing the optical core. The optical core includes a number of optical units having respective colors and being wound about a longitudinal axis of the cable. The sheath includes at least one non opaque longitudinal section through which a sequence of colors of the optical units is visible from outside the cable. The color sequence acts as an identifier for the cable. The cable may therefore be easily identified (e.g. amongst other cables laid down within the same duct) by a simple visual inspection of the cable's inner structure through the non opaque section(s) of its external sheath.

Abstract: Submarine flexible pipe includes a metal flexible carcass, an inner polymeric liner arranged in a radially outer position with respect to the metal flexible carcass, a protective polymeric outer sheath and a mechanical armor structure arranged in a radially inner position with respect to the protective polymeric outer sheath, the mechanical armor structure being potentially exposed to water contact. The mechanical armor structure includes a pressure resistant armor and a tensile armor arranged in a radially outer position with respect to the inner polymeric liner. The mechanical armor structure includes a plurality of carbon steel elongated elements, each of the carbon steel elongated elements being coated by an aluminum cladding.