H - Electricity – 01 – C
Patent
H - Electricity
01
C
H01C 7/12 (2006.01) B29C 45/14 (2006.01) B29C 70/72 (2006.01) H01C 8/04 (2006.01)
Patent
CA 2281810
An electrical surge arrester is manufactured by securing a stack of metal oxide varistor blocks between end terminations by passing a rod through through- holes in the varistor blocks and securing the ends of the rod to the end terminations. The through-holes are larger than the rod cross section and a silicone rubber material is injected into the void which otherwise would exist between the rod and the interior surfaces of the through-holes in the varistor blocks. The silicone rubber material is also moulded around the exterior of the stacked varistor blocks and forms a shedded external housing for the arrester. The silicone rubber coatings on the varistor block internal and external surfaces effects a passivation function and means that the passivation coatings normally provided on the surfaces of varistor blocks by their manufacturers at significant cost can be omitted.
L'invention concerne un limiteur de surtension qui est fabriqué en fixant une pile de blocs de varistances à oxyde métallique entre des extrémités terminales, en insérant une tige dans les trous traversants des blocs de varistances et en fixant les extrémités de la tige aux extrémités terminales. Lesdits trous sont plus larges que la coupe transversale de la tige. Ainsi, on injecte une matière caoutchouc de silicone dans le vide qui, sinon, existerait entre la tige et les surfaces internes des trous traversants des blocs de varistances. La matière caoutchouc de silicone est également moulée autour de la paroi extérieure des blocs de varistances superposés et forme une enveloppe externe protégeant le limiteur. Les revêtements en caoutchouc de silicone déposés sur les surfaces interne et externe du bloc de varistances remplissent une fonction de passivation. Cela signifie que les revêtements de passivation, que les producteurs déposent normalement sur les surfaces des blocs de varistances, à un coût significatif, peuvent être omis.
Doone Rodney Meredith
Short Patrick George
Bowthorpe Industries Limited
Sim & Mcburney
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