Surge arrester
AssigneeASEA Aktiebolag
InventorsPer-Ake Hellman, Lennart Stenstrom
Life of this patent
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Abstract
A surge arrester includes an elongated insulating housing comprising one or more stacks of electrically series-connected metal oxide varistor blocks arranged between a top terminal and a bottom terminal. To achieve a more even voltage distribution in the longitudinal direction of the surge arrester, the surge arrester comprises larger varistor blocks at the top terminal than at the bottom terminal.
Claims5
A surge arrester comprising a top terminal, a bottom terminal and at least one surge arrester unit connected between said top and bottom terminals, said surge arrester unit comprising an elongated electrically insulating housing and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack or in a plurality of electrically series-connected stacks in the electrically insulating housing, the varistor blocks at the top terminal of the arrester having a greater diameter than the varistor blocks at the bottom terminal of the arrester.
A surge arrester comprising a top terminal, a bottom terminal and at least two surge arrester units electrically connected in series between said top and bottom terminals, each surge arrester unit comprising an elongated electrically insulating housing, provided with metallic flange means, and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack in the electrically insulating housing, the varistor blocks in the surge arrester unit which is nearest the top terminal having a greater diameter than the varistor blocks in the surge arrester unit which is nearest the bottom terminal.
Dependencies are inferred from the claim text.