A multicore cable includes a plurality of coated electric wires; a detection wire; and a sheath. The coated electric wires include an electric wire conductor and an electric wire coating. The electric wire conductor is a stranded wire of a plurality of electric wire filaments. The electric wire coating covers an outer surface of the electric wire conductor. The detection wire includes a detection wire conductor that is a stranded wire of a plurality of detection wire filaments. The sheath covers an outer surface of a core that includes the coated electric wires and the detection wire. The detection wire is disposed in a region enclosed by the coated electric wires. A filament diameter of the detection wire filaments is equal to or greater than a filament diameter of the electric wire filaments.

Disclosed is a leak detection cable that has an outer jacket layer and a four wire construction in a flat wire configuration that is twisted in a helix. Detection cables are disposed on the exterior surface adjacent openings of the jacket to allow for detection of aqueous fluids. The wire is twisted in a helix to allow adjacent detector wires to easily detect aqueous fluids. Disparate materials are used for the jacket and the coatings of the wires, to allow the jacket to be easily removed from the wires without affecting the integrity of the coatings of the wires. The four flat wire configuration is sized and spaced for easy connection to an insulation displacement connector.

A bend stiffener including a body tapering from a base to a top. The body has a central through-opening, extending from the base to the top, which is arranged to receive a subsea cable or umbilical, and a first bend indicator arranged on the body. The first bend indicator has a proximal portion having a fixed end which is fixed relative to the body and a distal portion which has a free end. The first bend indicator extending from the fixed end to the free end in the axial direction of the body. The distal portion covers a bend indication portion of the bend stiffener, which bend indication portion has a first visual appearance, and which distal portion has a second visual appearance. The first visual appearance differs from a visual appearance of an area of the bend stiffener surrounding the bend indication portion.

A bend stiffener including a body tapering from a base to a top. The body has a central through-opening, extending from the base to the top, which is arranged to receive a subsea cable or umbilical, and a first bend indicator arranged on the body. The first bend indicator has a proximal portion having a fixed end which is fixed relative to the body and a distal portion which has a free end. The first bend indicator extending from the fixed end to the free end in the axial direction of the body. The distal portion covers a bend indication portion of the bend stiffener, which bend indication portion has a first visual appearance, and which distal portion has a second visual appearance. The first visual appearance differs from a visual appearance of an area of the bend stiffener surrounding the bend indication portion.

The present invention relates to a nuclear power plant cable including: conductors; at least one or more insulation layers adapted to correspondingly surround the conductors; a sheath adapted to surround the insulation layers; and monitoring means adapted to monitor the states of the insulation layers or the state of the sheath in real time.

The present invention relates to a nuclear power plant cable including: conductors; at least one or more insulation layers adapted to correspondingly surround the conductors; a sheath adapted to surround the insulation layers; and monitoring means adapted to monitor the states of the insulation layers or the state of the sheath in real time.

A cable includes an indicating element for detecting the infiltration of water into the cable and a method using such indicating element.

A cable includes a plurality of covered electric wires and an outer sheath, wherein the plurality of covered electric wires include two first covered electric wires, two second covered electric wires having a larger conductor cross-sectional area than the first covered electric wires, and two third covered electric wires having a smaller conductor cross-sectional area than the second covered electric wires, and wherein the two first covered electric wires are twisted together along a longitudinal direction thereof to form a first twisted wire pair, the two third covered electric wires are twisted together along a longitudinal direction thereof to form a second twisted wire pair, a twist pitch of the second twisted wire pair is longer than a twist pitch of the first twisted wire pair, the first twisted wire pair, the two second covered electric wires, and the second twisted wire pair are twisted together to form a core, in the core, at least a partial contact is provided between the first covered electric wires and the second covered electric wires, between the second covered electric wires and the third covered electric wires, and between the two first covered electric wires, and the outer sheath is arranged to cover the core.

The present disclosure provides a cable structure with information transmission and risk early warning functions and a method of using the same. An optical fiber unit includes a communicating optical fiber unit and a sensing optical fiber unit. The communicating optical fiber unit consists of a single-mode optical fiber and a casing for protecting the optical fiber. The sensing optical fiber unit consists of a single-mode optical fiber and/or a multimode optical fiber and a casing for protecting the optical fiber. The optical fiber unit includes a single optical fiber or a plurality of optical fibers. The optical fiber in the communicating optical fiber unit and the optical fiber in the sensing optical fiber unit are packaged separately in separate casings or packaged together in a same casing. The optical fiber unit is placed between an outer sheath and a waterproof insulating layer of the power transmission unit.

This power cable monitoring system includes: a power cable including a power transmission cable provided at an inner circumferential part, an armoring wire provided at an outer circumferential part, and sensor ropes having an optical fiber to detect a physical quantity of a measurement target; and a backscattering light measurement device which measures distribution of the physical quantity of the measurement target, using backscattering light from the optical fiber, wherein distribution of temperature and strain of the power cable is obtained from a frequency shift signal of Rayleigh backscattering light obtained by the backscattering light measurement device on the basis of a signal detected by the sensor ropes, and a polarization distribution signal obtained from the Rayleigh backscattering light.