Electrical protection apparatus
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United States of America Patent
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-
Jun 28, 1994
Grant Date -
N/A
app pub date -
Sep 15, 1992
filing date -
Mar 15, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A surge arrester 2 comprises eight surge arresting varistor blocks 4 stacked within a polymeric outer insulating housing 14. A fibre optic cable 16 is fed into the surge arrester 2 through one end electrode 6, helically wound around all the blocks 4 in good thermal contact therewith and exits through the same electrode 6. A monitoring arrangement 18 compares the light incident on and emergent from the optical cable 16 to determine its integrity and thus the integrity of the surge arrester 2.
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