Hitachi, Ltd.

Akio Mizukoshi

Jun Ozawa

Yoshi Akatsu

Shingo Shirakawa

Seizo Nakano

Katsuji Shindo

Seiichi Maruyama

Katuji Shindo

A surge arrester having a first non-linear resistor block, a second non-linear resistor block connected in series with the first non-linear resistor block, a bypass gap connected in parallel with the second non-linear resistor block, and a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.

Surge arrester with a bypass gap

In an enclosed-type zinc-oxide surge arrester with a grounded tank filled with an insulating medium, and a non-linear resistor assemblage which is connected at one end to a high voltage conductor and at the other end to the ground potential portion within the grounded tank, two or more ring-like shield means such as shield rings are disposed on the high voltage conductor side of the non-linear resistor assemblage at given distances. The use of the ring-like shield means makes more uniform the voltages shared by the respective non-linear resistors. The ring-like shield means may be formed with the configuration and diameter, and the number of them used being properly selected.

Enclosed-type zinc-oxide surge arrester

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Hitachi, Japan

Akio Mizukoshi