Varistor surge arrestors, in particular for high tension

Electrical resistors – Resistance value responsive to a condition – Current and/or voltage

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361117, H01C 710

Patent

active

054971381

ABSTRACT:
A method of manufacturing a surge arrestor, comprising the following steps: making a stack of varistors and forming a first envelope that is at least semi-rigid thereon and that has an outside section that is constant along its length, thereby serving in particular to compensate for surface irregularities in the stack of varistors due to alignment faults and to dimensional dispersions in the varistors, after which an outer envelope of substantially constant thickness is extruded on the first envelope, and then annular fins are installed on the extruded outer envelope. A surge arrestor, comprising a stack of varistors, a first envelope surrounding the stack of varistors that is at least semi-rigid thereon and that has an outside section that is constant along its length, thereby serving in particular to compensate for surface irregularities in the stack of varistors due to alignment faults and to dimensional dispersions in the varistors, an outer envelope of substantially constant thickness extruded on the first envelope, and annular fins installed on the extruded outer envelope.

REFERENCES:
patent: 1497978 (1924-06-01), Jacobs
patent: 2276732 (1942-03-01), Ludwig et al.
patent: 3227983 (1966-01-01), Braun
patent: 4825188 (1989-04-01), Parraud et al.
patent: 4833438 (1989-05-01), Parraud et al.
patent: 4853670 (1989-08-01), Stengard
patent: 4940961 (1990-07-01), Thuries et al.

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