Measuring and testing – Liquid analysis or analysis of the suspension of solids in a...
Reexamination Certificate
2006-11-28
2006-11-28
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Reexamination Certificate
active
07140237
ABSTRACT:
An oil-filled transformer monitoring system is provided which calculates an oil temperature of an oil-filled transformer with high precision from a current of the transformer and an ambient temperature. The oil-filled transformer monitoring system of this invention has an oil temperature calculation device to calculate a transformer oil temperature using measurements from a transformer current measuring device and an ambient temperature measuring device. The transformer monitoring system also has an oil temperature measuring device and compares an output value from the oil temperature calculation device with an output value from the oil temperature measuring device to detect any anomaly.
REFERENCES:
patent: 4654806 (1987-03-01), Poyser et al.
patent: 6177803 (2001-01-01), Train et al.
patent: 6609079 (2003-08-01), Seitlinger
patent: 05-227644 (1993-09-01), None
patent: 08-213246 (1996-08-01), None
Dohi Manabu
Kondo Takayuki
Shirahata Toshiki
Frank Rodney
Hitachi Industrial Equipment Systems Co. Ltd.
Townsend and Townsend / and Crew LLP
Williams Hezron
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