Method of determining with great accuracy the rate of leakage from the case of an electrical apparatus
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Oct 22, 1998
filing date -
Oct 23, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the method, pairs of pressure and temperature values are recorded using a pressure sensor and a temperature sensor fixed to a case from the outside and communicating with a dielectric gas, thereby enabling a density value to be calculated for the dielectric gas corresponding to each recorded pair of values. Simultaneously with making the pressure and temperature records, an electric current flowing through an electrical apparatus located inside the case and a climate parameter relating to the medium in which the case is located are also recorded for the purpose of giving each density value an index, thereby enabling a leakage rate to be determined with improved accuracy on the basis of indexed leakage rates, each of which is obtained from density values all having the same index.
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