Lightning arrestor insulator
AssigneeNGK Insulators, Ltd.
InventorsShoji Seike, Takao Totoki, Masayuki Nozaki
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Abstract
In a lightning arrestor insulator wherein a ZnO element having voltage non-linear resistant characteristics is embedded in an insulator body and integrally fixed with a glassy bonding material, the glassy bonding material has a thermal expansion coefficient smaller than either of those of the ZnO element and the insulator body. As the glassy bonding material, a low melting PbO-B.sub.2 O.sub.3 system glass having a composition to separate, during solidification, low expanding ceramic crystals is preferably employed.
Claims15
A lightning arrestor insulator comprising:
- an insulator body;
- a ZnO element having voltage non-linear resistant characteristics, said element being embedded in said insulator body;
- and
- a glassy bonding material disposed between said insulator body and said ZnO element, said glassy bonding material integrally fixing said ZnO element to said insulator body;
- wherein said glassy bonding material has a thermal expansion coefficient which is smaller than a thermal expansion coefficient of said ZnO element and a thermal expansion coefficient of said insulator body.
A lightning arrestor insulator comprising:
- an insulator body;
- a ZnO element having voltage non-linear resistant characteristics, said element being embedded in said insulator body;
- and
- a glassy bonding material disposed between said insulator body and said ZnO element, said glassy bonding material integrally fixing said ZnO element to said insulator body;
- wherein a ratio (A) of the thermal expansion coefficient of said ZnO element to the thermal expansion coefficient of said glassy bonding material is in the range of 1<A.ltoreq.2 and a ratio (B) of the thermal expansion coefficient of said insulator body to the thermal expansion coefficient of said glassy bonding material is in the range of 1<B.ltoreq.2.5.
a lightning arrestor insulator comprising:
- an insulator body;
- a ZnO element having voltage non-linear resistant characteristics, said element being embedded in said insulator body;
- and
- a glassy bonding material disposed between said insulator body and said ZnO element said glassy bonding material integrally fixing said ZnO element to said insulator body, said glassy bonding material comprising a PbO-B.sub.2 O.sub.3 glass system having a composition which separates low expanding ceramic crystals during solidification, said composition comprising about 65-80 wt% of PbO;
- wherein a ratio (A) of the thermal expansion coefficient of said ZnO element to the thermal expansion coefficient of said glassy bonding material is in the range of 1<A.ltoreq.2 and a ratio (B) of the thermal expansion coefficient of said insulator body to the thermal expansion coefficient of said glassy bonding material is in the range of 1<B.ltoreq.2.5.
Dependencies are inferred from the claim text.