An aramid paper suitable for use as electrical insulation comprising a first outer layer and a second outer layer, each of which comprising 70 to 30 weight percent aramid floc and 30 to 70 weight percent aramid fibrids, and each of which being free of mica and having a first face and a second face; an inner layer comprising 50 to 70 weight percent aramid material and 30 to 50 weight percent mica and having a first face and a second face; wherein the first face of the first outer layer is a first outer face of the aramid paper, and the second face of the first outer layer is coextensive with and bound face-to-face with the first face of the inner layer solely by fibrids in the first outer layer and the inner layer; and wherein the first face of the second outer layer is coextensive with and bound face-to-face with the second face of the inner layer solely by fibrids in the second outer layer and the inner layer, and the second face of the second outer layer is a second outer face of the aramid paper; the aramid paper having a total of 25 to 40 weight percent mica.

Embodiments of the invention are directed to a method for manufacturing a composite polymer insulator. The method includes: providing an elongate core having a core axis, the core including a first core main section, a second core main section, and a core midsection axially interposed between the first and second core main sections; and mounting a joint sleeve around the core midsection. The method further includes molding a polymeric first housing onto the core such that: the first housing surrounds the first core main section; and a joint section the first housing overlaps and bonds to the joint sleeve. The method further includes molding a polymeric second housing onto the core such that: the second housing surrounds the second core main section; and a joint section of the second housing overlaps and bonds to the joint sleeve.

Embodiments of the invention are directed to a method for manufacturing a composite polymer insulator. The method includes: providing an elongate core having a core axis, the core including a first core main section, a second core main section, and a core midsection axially interposed between the first and second core main sections; and mounting a joint sleeve around the core midsection. The method further includes molding a polymeric first housing onto the core such that: the first housing surrounds the first core main section; and a joint section the first housing overlaps and bonds to the joint sleeve. The method further includes molding a polymeric second housing onto the core such that: the second housing surrounds the second core main section; and a joint section of the second housing overlaps and bonds to the joint sleeve.

A dry high voltage (HV) instrument transformer in the form of a HV current transformer includes a core casing having a secondary winding, a top housing, a primary winding, and a dry bushing, wherein the core casing comprises an insulation containing an electrically insulating material made of PES nonwoven impregnated and cured with low viscosity epoxy. The dry HV instrument transformer in the form of a HV voltage transformer includes a bottom tank housing, a cast of a primary winding module with an embedded screen surrounding the primary winding, a field grading disc, and a core, wherein the cast of the primary winding module is made of an insulating composite containing an electrically insulating material made of PES nonwoven impregnated and cured with low viscosity epoxy.

The present invention relates to a coated insulated wire having improved heat dissipation properties, insulation properties, flame retardancy, and lightweight properties; and a method of manufacturing the same.

The present invention relates to a coated insulated wire having improved heat dissipation properties, insulation properties, flame retardancy, and lightweight properties; and a method of manufacturing the same.

An insulated nanofiber having a continuous nanofiber collection extending along a longitudinal axis with an outside surface and an inside portion is described. A first material infiltrates the inside portion, where the outside surface of the nanofiber collection is substantially free of the first material. An electrically-insulating second material coats the outside surface of the nanofiber collection. A method of making an insulated nanofiber collection is also disclosed.

Thermally conductive electrically insulating compositions and structures and devices comprising such materials. In various embodiments, such materials comprise liquid crystal polymer and fillers, wherein the fillers comprise boron nitride and glass fiber. In various embodiments, the liquid crystal polymer is selected from the group consisting of semi-aromatic copolyesters, copolyamides, polyester-co-amides, and mixtures thereof.

Systems for inspecting pipes or cavities including a camera head, a coaxial push-cable, and a video signal transmitter and a communicatively coupled camera control unit (CCU) are disclosed.

Systems for inspecting pipes or cavities including a camera head, a coaxial push-cable, and a video signal transmitter and a communicatively coupled camera control unit (CCU) are disclosed.