Nissin Electric Co., Ltd.

Kureha Kagaku Kogyo Kabushiki Kaisha

Sugai Chemical Industry Co., Ltd.

Sadayoshi Mukai

Mineaki Nishimatsu

Kaname Ishida

Yasuo Inoue

Akira Ito

Fumio Tanimoto

Masanari Kikkawa

Nobuo Ahiko

Osamu Yamaguchi

Yasunori Suga

Yoshinori Hayashi

Masaru Kanba

A device for measuring a gas dissolved in an oil comprising a sample container for containing a sample oil, an air bubble generator for extracting the gas dissolved in the oil, a gas container for containing the gas, a gas sensor for detecting the gas charged in the gas container, gas measuring means for measuring a concentration of the gas in response to a signal dispatched from the gas sensor, and a pump for supplying air to the air bubble generator.

Device for measuring gas dissolved in oil

The electric device according to the present invention has as its constituents the insulating materials and elements comprising films of synthetic resin, for instance, polypropylene, impregnated with 1-phenyl-2-ethylphenylethane and/or 1-phenyl-2-isopropylphenylethane. According to the present invention, insulating oils having favorable compatibility with the film of synthetic resin such as polypropylene and favorable affinity to metals and having low viscosity have been provided, and in addition, electric devices excellent in properties of withstanding a high voltage and dielectric properties in a broad range of temperature from a low temperature to a high temperature have also been offered.

Electric device comprising impregnated insulating materials and electric

An insulating oil for use in electrical devices, comprising a mixture of trixylenylphosphate and 10% to 40% by volume of insulating oil having a viscosity of 5 cp to 15 cp at 30.degree.C and selected from the group consisting of mineral oil, alkylbenzene, alkylnaphthalene, diallylalkane, 2-diphenylmethylether, 2-diphenyl-isopropylether, paraffin hydrocarbon oil and naphthene hydrocarbon oil.

Insulating oil

An oil-filled electrical device comprising a casing, an electrical device element in the casing and an insulating oil consisting essentially of one or more 2-diphenylalkylether having the structural formula of ##SPC1## Wherein R is the alkyl group expressed as C.sub.n H.sub.2n.sub.+1 wherein R is 1.ltoreq.n423.8.

Oil filled electrical device

Growing community of inventors

Katano, Japan

Sadayoshi Mukai