Micro-isolators exhibiting enhanced isolation breakdown voltage are described. The micro-isolators may include an electrically floating ring surrounding one of the isolator elements of the micro-isolator. The isolator elements may be capacitor plates or coils. The electrically floating ring surrounding one of the isolator elements may reduce the electric field at the outer edge of the isolator element, thereby enhancing the isolation breakdown voltage.

An indoor rated communications cable includes a communications carrying medium surrounded by a jacket. A material used to form the jacket is a polymer including a microencapsulated ammonium octamolybdate (AOM) additive therein. In some embodiments, the polymer may include polyvinyl chloride (PVC), fluorinated ethylene propylene (FEP) or polyolefin (PO). One or more additional flame retardants may also be added to the polymer. The communications cable may be a twisted pair, fiber optic or coaxial cable. The present invention also provides a method of forming the communications cable.

An insulated electrically conductive element (1) for the aerospace field has an elongate electrically conductive element surrounded by at least two layers, said two layers being an electrically insulating layer (4) surrounding the elongate electrically conductive element (2) and a first semiconductor layer (5) surrounding said electrically insulating layer (4), at least one of the layers having at least one fluoropolymer.

The invention provides a corona shielding tape for use to form wound insulation by means of VPI impregnation with a pthalic anhydride-free impregnating epoxy resin. The shielding tape may comprise (1) a carrier tape comprised of a polymeric matrix comprising at least one polyvinyl alcohol derivative compound and having an electrically conductive or semi-conductive filler embedded therein, and (1) an adduct of one or more 1H-imidazole derivatives and one or more acrylates, or (2) a complex compound comprising (a) a metal salt selected from the group consisting of zinc, copper, iron, aluminum, and mixtures thereof, and (b) imidazole and/or pyrazole ligands.

A subsea electrical connector or electrical cable having a conductor, an insulator coaxial with the conductor; and at least one of a volumetric compensating diaphragm located radially outwardly of the insulator, or a termination boot. The diaphragm or termination boot has a compound layer, the compound layer includes a graphene nano-platelet additive incorporated into a cross-linked polymer matrix to produce a polymer composite.

The invention relates to an insulation element (1) with low electrical conductivity for the electrical insulation of an electrotechnical component in the high voltage range. The insulation element (1) comprises artificial fibres (2) and electrically conductive particles (3) having an electrically non-conductive core (5) and an electrically conductive or semi-conductive cladding (6) surrounding the core (5). Moreover, the insulation element (1) comprises a cationic polymer (4).

Magnet wire with corona resistant enamel insulation may include a conductor, and at least one layer of polymeric enamel insulation may be formed around the conductor. The polymeric enamel insulation may include a filler dispersed in a base polyamideimide material. The filler may include between 20 percent and 80 percent by weight of silica dioxide and between 20 and 80 percent by weight of titanium dioxide. Additionally, the polymeric enamel insulation may have a thermal index of at least 230° C. and a thermal index that is at least twice that of the base polymeric material.

A dielectric composite material includes an electrical insulator and primary nanoparticles. The primary nanoparticles are dispersed, without forming agglomerates, within the electrical insulator. The primary nanoparticles are of one more of the following types: aluminum, aluminum oxide, or aluminum coated with a surface oxide layer, and the electrical insulator being a dissimilar material from the primary nanoparticles.

There is provided a fiber that includes a fiber material disposed along a longitudinal-axis fiber length. A porous domain has a porous domain length along at least a portion of the fiber length, within the fiber material. The porous domain includes solid-phase material regions and fluid-phase interstitial regions that are both along the porous domain length and across the porous domain, for multi-dimensional porosity of the porous domain.

A resistor includes materials including copper, nickel, and lanthanum boride. A content of the materials is 40% by mass or more with respect to a total material content of the resistor. The copper includes copper particles having a particle diameter of 2.5 m or more. In addition, a circuit board includes a substrate, the resistor on the substrate, a metal layer on the resistor and a glass layer on the resistor. Further, an electronic device includes the circuit board and an electronic component on the metal layer.