The invention relates to an optical insulation monitoring device for power cables, having at least one optical waveguide for transmitting an optical signal integrated into a polymer film. The polymer film is arranged in such a way that the radially outer surface of the cable is surrounded by the polymer film in at least one longitudinal portion of the cable. At least some of the optical waveguides can be designed as multimode waveguides. The optical waveguides may be integrated in a plurality of layers in the polymer film, the optical waveguides of a first layer being arranged in staggered fashion with respect to the optical waveguides of a second layer arranged above or below the first layer. In this way, at least a section of the polymer film in the film plane is completely covered by the optical waveguides without any unwanted crosstalk between adjacent optical waveguides resulting.

An interferometric radioimager provides real-time, high-fidelity radioimaging of high voltage breakdown (HVB) both internal and external to electrical components at sub-nanosecond and sub-millimeter resolution and has an ability to resolve multiple/spatially-extensive HVB simultaneously. Therefore, radioimaging can be used to screen for early life weakness/failure and enable non-destructive screening of defective electrical components. In particular, radioimaging can detect precursors to catastrophic HVB, allowing for early detection of weakness in critical electrical components. Radioimaging can also be used to track HVB and pinpoint defects in electrical components real time, including transformers, capacitors, cables, switches, and microelectronics.

Methods and locating systems for determining an insulation fault location on an electric conductor of a subsea supply line are provided. By applying electric voltage on the electric conductor, an electrochemical reaction takes place at an insulation fault location between the metallic conductor material and the seawater, said electrochemical reaction forming gas, which in turn is connected to developing noise. Sonic sensors capture the sonic waves produced thereby within and without of the subsea supply line and evaluate the measuring signals in order to determine the insulation fault location. Alternatively or additionally to capturing noise, the gas-bubble image patterns occurring at the insulation fault location are optically captured and consulted in order to determine the insulation fault location.

An insulated electrical component of an insulated electrical machine includes a conducting element, a first radiographically-visible conductor sensor node coupled to the conducting element, at least one second radiographically-visible conductor sensor node coupled to the conducting element a first distance in a predetermined direction from the first radiographically-visible conductor sensor node, and an insulating material bonded to the conducting element. In some embodiments, the insulated electrical component further includes a first radiographically-visible insulator sensor node coupled to the insulating material and not coupled to the conducting element and at least one second radiographically-visible insulator sensor node coupled to the insulating material and not coupled to the conducting element a second distance from the first radiographically-visible insulator sensor node. The radiographically-visible sensor nodes are distinguishable from the conducting element and the insulating material in a radiographic image. Methods of manufacturing and non-destructive testing of insulated electrical components are also disclosed.

There are provided a device for removing partial discharge noise and a method of diagnosing the same. The device includes a noise removing device configured to remove noise of a partial discharge signal using a reaction rate difference of signals when the partial discharge signal is generated, and output a signal in which noise is removed, a laser module configured to output a laser beam to a surface of a power device when the partial discharge signal is generated and extract sound wave and vibration data from a reflection signal of the laser beam, a correlation analyzing unit configured to compare the partial discharge signal in which noise is removed input through a sensor connecting unit and the sound wave and vibration data extracted through the laser module, and analyze a correlation, and a partial discharge diagnostic unit configured to perform partial discharge diagnosis on a signal that matches the partial discharge signal in which noise is removed with at least one of a generation cycle, a time, and a phase of the sound wave and vibration data based on a result of correlation analysis of the correlation analyzing unit.

A method for distinguishing an arc from a luminous gas at least containing metal vapor includes sensing light in a monitoring region and determining a first intensity I.sub.λ1 of the sensed light at a first wavelength λ1 and a second intensity I.sub.λ2 of the sensed light at a second, greater wavelength λ2. The ratio I.sub.λ1/I.sub.λ2 between the first intensity I.sub.λ1 and the second intensity I.sub.λ2 is determined. The sensed light is associated with an arc if said ratio I.sub.λ1/I.sub.λ2 is greater than a specifiable first threshold value and/or with a luminous gas at least containing metal vapor if said ratio I.sub.λ1/I.sub.λ2 is less than a specifiable second threshold value.

A partial discharge (PD) detection apparatus for gas-insulated equipment includes a photon collector, an optical splitter, a first photoelectric conversion module, an ultraviolet fluorescent crystal, a second photoelectric conversion module, and a signal processing module, where the ultraviolet fluorescent crystal is configured to convert a second optical radiation signal into an optical radiation signal of an ultraviolet fluorescence band, and the signal processing module is configured to calculate first apparent intensity based on a first voltage signal output by the first photoelectric conversion module, calculate second apparent intensity based on a second voltage signal output by the second photoelectric conversion module, and determine discharge intensity of the optical radiation based on a ratio of the second apparent intensity to the first apparent intensity. Technical solutions of the present disclosure are not affected by an unknown distance between a discharge position and a detection point.

Systems, methods, and devices of the various embodiments enable the detection and localization of power line corona discharges and/or electrical arcs by an unmanned aerial vehicle (UAV) including an array of ultraviolet (UV) point detectors.

A cable structured to be repeatedly connected to a device, each repeated connection causing degradation of the cable, the cable including a condition indicator disposed on the cable and configured to be updated with each successive connection of the cable into the device.

The present invention includes devices and systems which detect an are flash electrical fault by calculating the rate of change in ultraviolet light, infrared light, and electrical current. This ensures compliance of plant electrical systems with 29 U.S.C. § 651 et seq. (1970), 29 CFR § 1910333, NFPA 70E and IEEE 1584 Standard. The devices and systems simultaneously provide a means for maintenance personnel to reduce long time, long time delay, short time, short time delay, instantaneous, ground fault, ground fault delay, and trip functions in the electronic trip units of typical low voltage breakers from a remote location outside the arc flash boundary. The devices and systems can also be controlled from a cloud-based computer which can be the host for the system operating software.