Improvements relating to electrical surge arresters

H - Electricity – 01 – C

Patent

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H01C 7/12 (2006.01)

Patent

CA 2356251

A high voltage (station class) surge arrester comprises a plurality of serially connected stages and each stage comprises a plurality of low voltage (distribution class) polymer housed solid state surge arresters which are electrically matched. The individual surge arresters of each stage arc connected together and to the respective surge arresters of the (or each) adjacent stage by means of cast metal mounting brackets (spiders) having plural equiangularly-spaced limbs to the ends of which the surge arresters are attached. Corona suppression rings are mounted at the top end of the arrester and separate corona suppression components are mounted at the ends of the limbs of the intermediate stages.

Un dispositif de protection contre les surtensions haute tension (classe station) comprend une pluralité de limiteurs de surtension à semi-conducteurs incorporés dans une matière polymère à faible tension (classe distribution) qui sont électriquement adaptés. Les limiteurs de surtension individuels de chaque étage sont reliés entre eux et aux limiteurs de surtension respectifs du ou des étages adjacents au moyen de supports de fixation en métal coulé (anneaux de centrage) dotés de plusieurs pattes à espacement équiangulaire aux extrémités desquelles sont attachés les limiteurs de surtension. Des anneaux supprimant la décharge par effet de couronne sont montés au niveau de l'extrémité supérieure du dispositif de protection contre les surtensions et des éléments séparés supprimant la décharge par effet de couronne sont montés aux extrémités des pattes des étages intermédiaires.

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