| 摘要 |
PROBLEM TO BE SOLVED: To monitor the diagnostic state (alteration, disconnection, short circuit etc.,) in a transformer from outside. SOLUTION: The transformer body 11 is provided with a bushing 13 via a bushing pocket 12, and in the bushing pocket 12 a transformer 15 for connecting an oscillator and a transformer 16 for current measurement are disposed. A transformer 14 is inputted with a high frequency signal from a frequency variable oscillator 19, the signal of which is outputted from the transformer 16 as a value of the current measurement. The outputted current value and the voltage of a line lead 21 are inputted to a frequency analyzer 20. By the frequency analyzer 20, the state in the transformer (abnormal level such as alteration, deformation, disconnection, short circuit) is compared with the difference between the predetermined state (normal level), determined and recorded by a determination/record device 23, thereafter if the state reaches the abnormal level, a warning device 24 is informed of it so as to give an alarm informing the abnormality state in the transformer. COPYRIGHT: (C)2004,JPO&NCIPI
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