Detection of internal humidity in a transformer via optical interferometry

To detect the internal humidity of the transformer accurately and sensitively and eliminate the interference caused by electromagnetic fields, an interferometric measurement is proposed in this paper for the first time, to the best of our knowledge. The phase value distribution of the interferogram...

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Bibliographic Details
Published in:Applied optics (2004) 2022-04, Vol.61 (10), p.2850
Main Authors: Jiang, Chenlai, Peng, Yue, Xue, Liang, Jiang, Chao, Yang, Chuankai, Jiang, Youhua, Chu, Fenghong
Format: Article
Language:English
Subjects:
Electromagnetic fields
Humidity
Interferometry
Time measurement
Transformers
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Summary:To detect the internal humidity of the transformer accurately and sensitively and eliminate the interference caused by electromagnetic fields, an interferometric measurement is proposed in this paper for the first time, to the best of our knowledge. The phase value distribution of the interferogram affected by humidity can be extracted quantitatively. The peak-to-peak value (P-P) of the phase image can reflect the humidity, according to theoretical analysis, and the main factors affecting the P-P are current and humidity. It has been tested by currents of 800 A, 1000 A, and 1200 A and different humidities. The paper reveals the relationship between humidity and P-P, proving that it is a reasonable application of real-time measurement of internal humidity in the transformer.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.453968