Hitachi, Ltd.

Moritaka Syouji

Ken Takahashi

Shingo Shirakawa

Shigehisa Motowaki

Shigeru Tanaka

Kunihiro Maeda

Takeo Yamazaki

Seiichi Yamada

Tadashi Kitami

Seiich Yamada

A ceramic resistor includes zinc oxide as a main component, and as essential components, aluminum oxide 3.0-40 mol %, magnesium oxide 2.0-40 mol %, silicon oxide 0.1-10 mol %, and at least one kind of compound 0.005-0.5 mol %, selected from a group consisting of calcium oxide, strontium oxide and barium oxide, and has a positive temperature coefficient of resistance. A neutral grounding resistor and a gas circuit breaker, each using the above-mentioned ceramic resistors, are disclosed.

Ceramic resistor, production method thereof, neutral grounding resistor

A non-linear resistor having a high impulse withstanding ability is obtained by directly applying a crystallized glass to the side surface of a sintered body of a ZnO element, and then bake-attaching the crystallized glass to the side surface of the ZnO element by heat treatment. Since the impulse withstanding ability is improved by applying the crystallized glass as the side surface high-resistivity layer of the voltage non-linear resistor, the performance and reliability of an arrester including the resistor is improved.

Voltage non-linear resistor and fabricating method thereof

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Hitachi, Japan

Moritaka Syouji