Patents Represented by Attorney Yaun Chao

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  • Surge arrester arranged to provide failure indication
    Patent number: 5991141
    Abstract: A failure indicator device for a surge arrester (2) employs a conventional explosive disconnector (10). Operation of the disconnector (10) due to earth fault current passing through the arrester (2) causes an arc to be formed. Movement of the disconnector (10) away from the arrester (2) is guided and limited by a support arrangement (18, 20) that subsequently provides a solid and permanent conductive path to earth (6) from the arrester terminal (12), thus extinguishing the arc.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: November 23, 1999
    Assignee: Raychem GmbH
    Inventors: Norbert Mikli, Steffen Bohrisch
  • Insulated electrical equipment
    Patent number: 5834686
    Abstract: A generally disc-shaped polymeric insulating article (14) is in two parts to fit around the core (4) of an insulator (2). A first part (22) of the article (14) is substantially C-shaped to fit around the insulator core (4), and the second part comprises an insert (30) that slidably engages the first part (22) so as to secure the article in place. The article (14) projects a substantial distance radially from the insulator (2) to prevent animals and the like, bridging the length of, and thus electrically short circuiting, the insulator (2).
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: November 10, 1998
    Assignee: Raychem Limited
    Inventors: Donald Christopher Barrett, Michael Robert Cook, Matthew Spalding