An electrical cable or electrical cable accessory includes at least one semiconducting layer, and at least one electrically insulating layer, at least partially in direct contact with the semiconducting layer. The electrically insulating layer is obtained from an insulating polymer composition having a thermoplastic polymer material, and the semiconducting layer is at least partially crosslinked.

A composition comprising (a) a cationically polymerisable epoxy resin, (b) an initiator for the cationic polymerisation, (c) a microparticle filler, and (d) a nanoparticle filler can be used for the production of thermally stable insulating material for electrical and electronic components.

A composition comprising (a) a cationically polymerisable epoxy resin, (b) an initiator for the cationic polymerisation, (c) a microparticle filler, and (d) a nanoparticle filler can be used for the production of thermally stable insulating material for electrical and electronic components.

A resin composition includes a phenoxy resin as a principal component. The phenoxy resin has a weight-average molecular weight of 40,000 or more. The phenoxy resin has, in the same or different molecules, a first structural unit derived from bisphenol S phenoxy and a second structural unit derived from a bisphenol epoxy other than the bisphenol S phenoxy. A content ratio of the first structural unit in the phenoxy resin is 20 mol% to 80 mol% relative to a total content of the first structural unit and the second structural unit constituting the phenoxy resin.

Provided are an epoxy resin composition that excels in solubility of a coloring agent and can impart a high insulating property without color unevenness in a cured product, and an ignition coil that exhibits an excellent property of impregnation of the epoxy resin composition into the coil and cracking resistance. The epoxy resin composition includes (A) an epoxy resin, (B) an acid anhydride, (C) an inorganic filler, and (D) a coloring agent. A difference between a solubility parameter (SP value) of a mixture of the epoxy resin (A) and the acid anhydride (B) and a solubility parameter (SP value) of the coloring agent (D) as measured by Fedors method is less than 3.1 [(cal/cm.sup.3).sup.1/2]. The SP value of the mixture of the epoxy resin (A) and the acid anhydride (B) is calculated from a weighted average of a solubility parameter (SP value) of the epoxy resin (A).

Provided are an epoxy resin composition that excels in solubility of a coloring agent and can impart a high insulating property without color unevenness in a cured product, and an ignition coil that exhibits an excellent property of impregnation of the epoxy resin composition into the coil and cracking resistance. The epoxy resin composition includes (A) an epoxy resin, (B) an acid anhydride, (C) an inorganic filler, and (D) a coloring agent. A difference between a solubility parameter (SP value) of a mixture of the epoxy resin (A) and the acid anhydride (B) and a solubility parameter (SP value) of the coloring agent (D) as measured by Fedors method is less than 3.1 [(cal/cm.sup.3).sup.1/2]. The SP value of the mixture of the epoxy resin (A) and the acid anhydride (B) is calculated from a weighted average of a solubility parameter (SP value) of the epoxy resin (A).

A film capacitor that includes a dielectric resin film having a glass transition temperature of 160° C. or higher and a density at 25° C. of 1.22 g/cm.sup.3 to 1.26 g/cm.sup.3; and a metal layer on at least one surface of the dielectric resin film.

Sensored insulation plug (1) for being inserted into a separable connector in a power distribution network comprises a plug body (140) formed by a solidified insulating material (610), and a primary capacitor (150), operable as a high-voltage capacitor in a voltage divider for sensing the elevated voltage. The primary capacitor includes a high-voltage electrode (160) for direct electrical connection to the elevated voltage. A sensing electrode (170) of a tubular shape, embedded in the plug body (140), arranged around the high-voltage electrode, comprises a deformable mesh of conductive wires forming a plurality of apertures between the wires to allow portions of the insulating material (610) on opposite sides of the mesh to be mechanically connected with each other by insulating material in the apertures while the insulating material solidifies and thereafter. A dielectric formed by a portion (180) of the insulating material (610) is arranged between the sensing electrode (170) and the high-voltage electrode (160).

Sensored insulation plug (1) for being inserted into a separable connector in a power distribution network comprises a plug body (140) formed by a solidified insulating material (610), and a primary capacitor (150), operable as a high-voltage capacitor in a voltage divider for sensing the elevated voltage. The primary capacitor includes a high-voltage electrode (160) for direct electrical connection to the elevated voltage. A sensing electrode (170) of a tubular shape, embedded in the plug body (140), arranged around the high-voltage electrode, comprises a deformable mesh of conductive wires forming a plurality of apertures between the wires to allow portions of the insulating material (610) on opposite sides of the mesh to be mechanically connected with each other by insulating material in the apertures while the insulating material solidifies and thereafter. A dielectric formed by a portion (180) of the insulating material (610) is arranged between the sensing electrode (170) and the high-voltage electrode (160).

The invention relates to an electrically insulating composite material (1) comprising a polyepoxide matrix (2) of cycloaliphatic type or of diglycidyl ether type in a content of less than 40% by mass, from 20 to 75% by mass of one or several micrometric and/or mesometric filler(s) (3), and from 0.1 to 20% by mass of at least one ionic liquid (4), the masses being expressed relative to the total mass of the electrically insulating composite material (1). The invention also relates to a method for manufacturing such an electrically insulating composite material (1), as well as its use for an electrically insulating support (9) in a metal-enclosed substation (5).