A tubular cable interconnect unit arranged on an outer periphery of a joint of a power cable, includes a tubular insulating tube, a non-ohmic resistor layer formed from a non-ohmic composition and provided on an inner peripheral surface of the insulating tube, and an inner semiconductive layer provided on the non-ohmic resistor layer, wherein the non-ohmic composition includes a base polymer including at least one of thermoplastic and rubber, and varistor grains having a non-ohmic characteristic in which a volume resistivity varies non-linearly with respect to an applied voltage, and the varistor grains have a maximum grain diameter of 30 m or less.

A tubular cable interconnect unit arranged on an outer periphery of a joint of a power cable, includes a tubular insulating tube, a non-ohmic resistor layer formed from a non-ohmic composition and provided on an inner peripheral surface of the insulating tube, and an inner semiconductive layer provided on the non-ohmic resistor layer, wherein the non-ohmic composition includes a base polymer including at least one of thermoplastic and rubber, and varistor grains having a non-ohmic characteristic in which a volume resistivity varies non-linearly with respect to an applied voltage, and the varistor grains have a maximum grain diameter of 30 m or less.

The present invention relates to a cable fitting for cables that can be used for high-voltage direct-current (HVDC) energy transmission, where the cable fitting has an electrically insulating layer, to a process for the production of an electrically insulating layer of such a cable fitting, and also to use thereof.

The present invention relates to a cable fitting for cables that can be used for high-voltage direct-current (HVDC) energy transmission, where the cable fitting has an electrically insulating layer, to a process for the production of an electrically insulating layer of such a cable fitting, and also to use thereof.

Provided are a high dielectric insulating silicone rubber composition and an electric field relaxation layer. This high dielectric and insulating silicone rubber comprises: (A) 100 parts by mass of an organopolysiloxane represented by formula (1),

R.sup.1.sub.nSiO.sub.(4n)/2(1),

(in the formula, R.sup.1 represents the same or different, substituted or unsubstituted monovalent hydrocarbon groups, and n is a positive number of 1.95 to 2.04); (B) 60 to 150 parts by mass of thermal black having an average primary particle size of 150 to 500 nm; (C) 5 to 100 parts by mass of reinforcing fumed silica having a specific surface area measured by a BET adsorption method of 50 m.sup.2/g or more; and (D) 0.1 to 10 parts by mass of a curing agent. The composition is characterized in that a cured product thereof satisfies a dielectric constant of 10 or more, a volume resistivity of 1.010.sup.13 to 1.010.sup.17 .Math.cm, a loss tangent of 0.1 or less, and a dielectric breakdown strength (BDV) of 7 kV/mm or more.

Provided are a high dielectric insulating silicone rubber composition and an electric field relaxation layer. This high dielectric and insulating silicone rubber comprises: (A) 100 parts by mass of an organopolysiloxane represented by formula (1),

R.sup.1.sub.nSiO.sub.(4n)/2(1),

(in the formula, R.sup.1 represents the same or different, substituted or unsubstituted monovalent hydrocarbon groups, and n is a positive number of 1.95 to 2.04); (B) 60 to 150 parts by mass of thermal black having an average primary particle size of 150 to 500 nm; (C) 5 to 100 parts by mass of reinforcing fumed silica having a specific surface area measured by a BET adsorption method of 50 m.sup.2/g or more; and (D) 0.1 to 10 parts by mass of a curing agent. The composition is characterized in that a cured product thereof satisfies a dielectric constant of 10 or more, a volume resistivity of 1.010.sup.13 to 1.010.sup.17 .Math.cm, a loss tangent of 0.1 or less, and a dielectric breakdown strength (BDV) of 7 kV/mm or more.

A communications cable is provided that includes a pair of twisted pair of wires, each coated with a fluoropolymer insulator. The twisted pair of wires is configured to carry a differential signal, such as a differential data signal and/or a differential power signal. The fluoropolymers are highly effective insulators and significantly reduce both the effects of internal and external electromagnetic interference while maintaining low cable attenuation, even when operating within a temperature range of 40 C. to 150 C.

A communications cable is provided that includes a pair of twisted pair of wires, each coated with a fluoropolymer insulator. The twisted pair of wires is configured to carry a differential signal, such as a differential data signal and/or a differential power signal. The fluoropolymers are highly effective insulators and significantly reduce both the effects of internal and external electromagnetic interference while maintaining low cable attenuation, even when operating within a temperature range of 40 C. to 150 C.

The present invention provides: a resin composition for a heat-resistant electric wire, containing from 25 to 60 parts by weight of a polyphenylene ether, from 15 to 42 parts by weight of a polypropylene-based resin, from 8 to 27 parts by weight of a styrene-based elastomer, from 5 to 15 parts by weight of a polyamide, and from 1 to 10 parts by weight of an acid-modified polyolefin, in which the polyamide has a melting point of 201 C. or more; and a heat-resistant electric wire using the composition.

The present invention provides: a resin composition for a heat-resistant electric wire, containing from 25 to 60 parts by weight of a polyphenylene ether, from 15 to 42 parts by weight of a polypropylene-based resin, from 8 to 27 parts by weight of a styrene-based elastomer, from 5 to 15 parts by weight of a polyamide, and from 1 to 10 parts by weight of an acid-modified polyolefin, in which the polyamide has a melting point of 201 C. or more; and a heat-resistant electric wire using the composition.