Sumitomo Electric Industries, Limited

Yoitsu Sekiguchi

Takanori Yamazaki

Kohei Hosomizu

Yasuhiro Tanaka

Shinya Nishikawa

Hiroshi Hayami

Yoshiyuki Inoue

Masumi Fukuma

Ryota Fukumoto

Toshikazu Shibata

Shuhei Yasuda

Tatsuo Takada

Ken-ichi Hirotsu

Shoshi Katakai

Tsuyoshi Uozumi

Hirofumi Hirota

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 &#x3bc;m or less.

Non-ohmic composition and method for manufacturing same, cable interconnect unit and cable end-connect unit

A resin composition forming an insulation layer, including a base resin containing polyolefin, and an inorganic filler; wherein a surface of the inorganic filler includes a hydrophobic silyl group represented by formula (1) and an aminosilyl group having an amino group.

Resin composition, inorganic filler, direct-current power cable, and method of manufacturing direct-current power cable

A resin composition molded article forming an insulation layer of a direct-current power cable, including: a cross-linked base resin containing polyethylene, and an inorganic filler having a mean volume diameter of 80 nm or less, wherein at least a part of a surface of the inorganic filler includes an aminosilyl group having an amino group, and a light transmittance at a wavelength of 500 nm of a sheet is 70% or more, as measured under an atmosphere at 90, when the sheet is fabricated by cutting the resin composition molded article into 0.5 mm thickness.

Resin composition molded article and direct-current power cable

An evaluation method for insulation performance includes: a step &#x3b1; of applying a DC voltage to a first insulator and measuring an integration value of a current flowing through the first insulator from a start of application of the DC voltage after a prescribed time period; a step &#x3b2; of applying a DC voltage to the second insulator on an applying condition that is identical to that in the step &#x3b1; and measuring an integration value of a current flowing through the second insulator from a start of application of the DC voltage after a prescribed time period; and a step &#x3b3; of comparing (i) a first graph obtained in the step &#x3b1; and (ii) a second graph obtained in the step &#x3b2;, to evaluate a difference between insulation performances of the insulators.

Evaluation method for insulation performance of insulator

An object of the present invention is to provide an electrically insulative resin composition that exhibits superior electrical properties and processability and an electric wire or cable having a covering made of the resin. The electrically insulative resin composition comprises 60 to 90 percent by weight of ethylene-&#x3b1;-olefin copolymer (A) polymerized with a single-site catalyst and 40 to 10 percent by weight of another polyolefin resin (B), which is other than (A), wherein the composition contains a polyolefin having a graft-polymerized substituent with a dipole moment of not less than 4 Debye.

Electrically insulating resin composition and a DC electric wire or cable both coated therewith

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Osaka, Japan

Yoitsu Sekiguchi