Mitsubishi Electric Corporation

Ryoko Kawano

Junichi Abe

Manabu Yoshimura

Shinichiro Nakauchi

Soichiro Kainaga

Takao Tsurimoto

Satoru Sato

Nobuo Yokomura

Naoki Yasuda

Katsuhiko Horinouchi

A gas-insulated electric apparatus includes: a sealed container made of metal; a high-voltage conductor, housed within the sealed container, that receives voltage; an insulating support member that insulates the high-voltage conductor from the sealed container and support the high-voltage conductor to the sealed container; and a nonlinear-resistance film covering at least a portion of an inner surface of the sealed container, the portion being on a lower side of the inner surface with respect to the high-voltage conductor. The nonlinear-resistance film is formed by particles of a nonlinear-resistance material and an insulating material, and the particles of the nonlinear-resistance material are dispersed in the insulating material. The particles of the nonlinear-resistance material are placed in the insulating material such that one or more of the particles of the nonlinear-resistance material is in constant contact with a conductive foreign object trapped inside the sealed container.

Gas-insulated electric apparatus and manufacturing method of gas-insulated electric apparatus

A coating material of the present invention includes an insulating resin, and dispersion particles dispersed in the insulating resin. The dispersion particle includes a core particle containing zinc oxide as a main component and having nonlinear resistance, and a resin layer covering the surface of the core particle and having an average thickness being less than or equal to 5.0 &#x3bc;m. The coating material of the present invention is a coating material for coating an inner surface of a ground tank of a gas insulated switchgear.

Coating material, coating film, and gas insulated switchgear

A gas-insulated electrical equipment includes: a grounded tank filled with an insulating gas; a central conductor which is disposed inside the grounded tank and to which to apply a voltage; a high-resistance insulating portion which is disposed on an inner surface of the grounded tank and which is configured of an insulating material of high resistivity; a low-resistance insulating portion which is disposed on at least a partial front surface of the high-resistance insulating portion and which has a resistivity lower than that of the high-resistance insulating portion, and a non-linear resistance insulating portion which is disposed on at least a partial front surface of the low-resistance insulating portion and which is configured of a non-linear resistance material, which exhibits a non-linear resistivity relative to a change in electric field, and an insulating material of high resistivity, wherein the low-resistance insulating portion has a floating potential.

Gas-insulated electrical equipment

A gas-insulated switchgear includes a grounded tank filled with insulation gas, a center conductor which is disposed in the grounded tank and to which a voltage is applied, an insulating support member which insulates and supports the center conductor, and a nonlinear resistive part disposed at least on a vertically lower side inner surface of the grounded tank and formed by an insulation material containing a nonlinear resistive material. If an electric field applied to the nonlinear resistive part is higher than an electric field value in a vicinity of a contact point between the nonlinear resistive part and a metallic foreign substance mixed in the grounded tank during an operation, a resistivity of the nonlinear resistive part at the center conductor side is lower than a resistivity at which a discharge delay time is equal to an electric field relaxation time constant.

Growing community of inventors

Chiyoda-ku, Japan

Ryoko Kawano