Title:
TRANSFORMER OIL TEMPERATURE MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JP3064854
Kind Code:
B2
Abstract:
PURPOSE: To accurately measure the oil temperature of a transformer by providing an oil temperature converting means for making temperature conversion based on a temperature measurement means mounted to the outside of a case and a load factor measurement means.
CONSTITUTION: In a power reception/distribution facility 12, voltage is stepped down by an oil transformer 1 and voltage and current are inputted to a load factor measuring means 5 of a transformer within a power control equipment 11 by a PT 3 for measuring voltage and a CT 4 for measuring current, respectively. A transformer oil temperature conversion means 6 calculates the amount of oil temperature change of the transformer by transformer oil temperature conversion means 8a and 8b according to the judgment of a condition measurement means 7. When the change in the transformer oil temperature is large, a value obtained by multiplying the transformer oil temperature before a specific time by a corrective coefficient which matches the case temperature difference when converting oil temperature and before a specific time limit is added. When the change in oil temperature is small, a corrective value according to the load factor is added to the case temperature when converting oil temperature, thus easily measuring the oil temperature outside the transformer 1 with a simple structure.
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Inventors:
Hiroyuki Kondo
Kenshichiro Mishima
Tomohiro Fujii
Shigeru Hirano
Kenshichiro Mishima
Tomohiro Fujii
Shigeru Hirano
Application Number:
JP2040795A
Publication Date:
July 12, 2000
Filing Date:
February 08, 1995
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H01F27/00; H02H7/04; (IPC1-7): H01F27/00
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)