A method of manufacturing a connector device suitable for making an inter or intra static electrical energy converter connection. The device includes at least two flat conductors and at least one insulating material. The said method includes: preparing each flat conductor individually; applying at least one coat of enamel varnish to each conductor, which is thinner than a desired final thickness; carrying out cross-linking of the enamel coating; and repeating the depositing of a layer of enameling resin and the cross-linking until the chosen thickness is reached. The varnish coated conductors of the connector device are assembled by using a template and connecting elements.

An electric wire and coil covered with a cured product of a heat- or photo-curable fluorinated polymer and having high insulating properties and high productivity. An electric wire having a conductor wire and a covering layer covering the outer periphery of the conductor wire. The covering layer is made of a cured product of a curable composition which has a fluorinated polymer containing at least three functional groups represented by the following formula (F): R.sup.f1COZ.sup.1 (F). In formula (F), R.sup.f1 is a single bond, a fluoroalkylene group, or a fluoroalkylene group with at least two carbon atoms having an etheric oxygen atom between carbon-carbon atoms, Z.sup.1 is NR.sup.1NR.sup.2H, NR.sup.3OR.sup.4 or OR.sup.5, and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently a hydrogen atom or an alkyl group.

An insulated conductor of the present invention is an insulated conductor having a conductor and an insulating film provided on a surface of the conductor, in which the insulating film has a fluorine-containing resin composition layer including a cured product of a thermosetting resin and a fluororesin and a fluorine concentration gradient layer which is disposed between the conductor and the fluorine-containing resin composition layer, includes a cured product of a thermosetting resin and a fluororesin, and is provided with a concentration gradient in which a fluorine atom content decreases from the fluorine-containing resin composition layer side toward the conductor.

A coated electrical accessory includes a bare electrical accessory and a substantially inorganic and dried coating layer coating the bare electrical accessory. The coating layer includes a heat radiating agent and a binder. When the coated electrical accessory is tested in accordance with ANSI CI 19.4-2004 with an amount of imparted current, the coated electrical accessory exhibits an operating temperature that is less than an operating temperature of a bare electrical accessory tested in accordance with ANSI CI 19.4-2004 with the same amount of imparted current. Methods are also provided.

A coated electrical accessory includes a bare electrical accessory and a substantially inorganic and dried coating layer coating the bare electrical accessory. The coating layer includes a heat radiating agent and a binder. When the coated electrical accessory is tested in accordance with ANSI CI 19.4-2004 with an amount of imparted current, the coated electrical accessory exhibits an operating temperature that is less than an operating temperature of a bare electrical accessory tested in accordance with ANSI CI 19.4-2004 with the same amount of imparted current. Methods are also provided.

A cable is composed of a linear shape conductor, a first electrical insulating member coating a periphery of the conductor, a shield made of a plating layer coating a surface of the first electrical insulating member, a second electrical insulating member coating a surface of the shield, and an exposed shield portion provided in at least one end portion of the cable with the second electrical insulating member being removed therefrom and the shield being exposed therein during termination. An adhesion strength between the shield and the second electrical insulating member in the exposed shield portion is lower than an adhesion strength between the shield and the second electrical insulating member in an other part of the surface of the shield.

This insulated flat conductive wire includes: a flat conductive wire having an aspect ratio a/b of 12 or more, wherein the aspect ratio is a ratio of a length a of a long side of a rectangular cross-section to a length b of a short side thereof; and an insulating film which consists of a polyamide-imide resin or a polyimide resin and coats the flat conductive wire, wherein the insulating film has a film thickness t1 of 10 m or more at a center portion of the long side of the rectangular cross-section, and the insulating film has a film thickness ratio t1/t2 of 0.80 to 1.35, and wherein the film thickness ratio t1/t2 is a ratio of the film thickness t1 at the center portion of the long side to a film thickness t2 at an edge portion of the long side of the rectangular cross-section.

This insulated flat conductive wire includes: a flat conductive wire having an aspect ratio a/b of 12 or more, wherein the aspect ratio is a ratio of a length a of a long side of a rectangular cross-section to a length b of a short side thereof; and an insulating film which consists of a polyamide-imide resin or a polyimide resin and coats the flat conductive wire, wherein the insulating film has a film thickness t1 of 10 m or more at a center portion of the long side of the rectangular cross-section, and the insulating film has a film thickness ratio t1/t2 of 0.80 to 1.35, and wherein the film thickness ratio t1/t2 is a ratio of the film thickness t1 at the center portion of the long side to a film thickness t2 at an edge portion of the long side of the rectangular cross-section.

A technique facilitates construction and use of a power cable in a variety of environments, e.g. downhole environments. The power cable comprises a conductor, e.g. a plurality of conductors. Each conductor is surrounded by an insulation layer which is coated with a graphene-based ink. The graphene-based ink comprises graphene nanostructures and provides a flexible primary barrier coating for the power cable. The flexible primary barrier coating substantially increases fluid resistance of the insulation layer and also reduces transmission of downhole gases into the power cable insulation.

A technique facilitates construction and use of a power cable in a variety of environments, e.g. downhole environments. The power cable comprises a conductor, e.g. a plurality of conductors. Each conductor is surrounded by an insulation layer which is coated with a graphene-based ink. The graphene-based ink comprises graphene nanostructures and provides a flexible primary barrier coating for the power cable. The flexible primary barrier coating substantially increases fluid resistance of the insulation layer and also reduces transmission of downhole gases into the power cable insulation.