Fiberglass reinforced plastic insulating member submitted to mechanical efforts within a high-voltage switching enclosure containing sulphur-hexafluoride gas
First Claim
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1. A fiberglass-reinforced plastic electric-insulating member which is subject to mechanical forces and in contact with decomposition products of SF6 gas which comprises a fiberglass reinforcement made of a low alkali glass containing neither boron nor boron-containing compounds, said glass having the following composition in percentages by weight:
- 50-65% SiO220-30% Al2 O25-20% MgO2-10% CaOthe sum of the weight percentages of CaO and MgO lying in the range of 15 to 25%,the ratio of the weight percentage of SiO2 to that of Al2 O3 being at least 2 and at the most 2.5, andthe ratio of the weight percentage of MgO to that of SiO2 not exceeding 0.3.
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Accused Products
Abstract
The resistance of insulating pieces made of fiberglass reinforced plastics against the decay products of SF6, such as occur within sealed high-voltage switching devices is unexpectedly enhanced by the use of a reinforcing fiberglass made of a low-alkali silicate glass containing neither boron nor boron-compounds.
35 Citations
1 Claim
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1. A fiberglass-reinforced plastic electric-insulating member which is subject to mechanical forces and in contact with decomposition products of SF6 gas which comprises a fiberglass reinforcement made of a low alkali glass containing neither boron nor boron-containing compounds, said glass having the following composition in percentages by weight:
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50-65% SiO2 20-30% Al2 O2 5-20% MgO 2-10% CaO the sum of the weight percentages of CaO and MgO lying in the range of 15 to 25%, the ratio of the weight percentage of SiO2 to that of Al2 O3 being at least 2 and at the most 2.5, and the ratio of the weight percentage of MgO to that of SiO2 not exceeding 0.3.
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Specification
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Current AssigneeSprecher & Schuh AG (Rockwell Automation, Inc.)
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Original AssigneeSprecher & Schuh AG (Rockwell Automation, Inc.)
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InventorsZahner, deceased, Hansruedi
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Primary Examiner(s)Robinson, Ellis P.
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Application NumberUS06/202,422Time in Patent Office852 DaysField of Search428/285, 428/430, 428/426, 428/417, 106/50, 174/DIG. 1, 524/494, 524/492, 501/35, 501/70US Class Current524/492CPC Class CodesH01B 3/087 Chemical composition of glassH01H 33/021 Use of solid insulating com...Y10S 174/01 Anti-trackingY10T 428/24994 Fiber embedded in or on the...Y10T 428/31525 Next to glass or quartzY10T 428/31616 Next to polyester [e.g., al...
