Varistor surge arrestors, in particular for high tension
US5497138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1993 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Nov 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.