A Complex Permittivity Based Sensor for the Electrical Characterization of High-Voltage Transformer Oils

Sensors

Constantine T. Dervos¹  Christos D. Paraskevas¹  Panayotis D. Skafidas¹ 

[1] School of Electrical and Computer Eng., National Technical University of Athens, 9, Iroon Polytechniou Str, Zografou 157 80, Athens, Greece

关键词: dielectric spectroscopy;    polarization effects;    transformer oils;    tanδ;    insulation aging;   

DOI  :  10.3390/s5040302

来源: mdpi

【 摘 要 】

This work investigates the use of a specially designed cylindrical metal cell, in order to obtain complex permittivity and tanδ data of highly insulating High Voltage (HV) transformer oil samples. The data are obtained at a wide range of frequencies and operation temperatures to demonstrate the polarization phenomena and the thermally stimulated effects. Such complex permittivity measurements may be utilized as a criterion for the service life prediction of oil field electrical equipment (OFEE). Therefore, by one set of measurements on a small oil volume, data may be provided on the impending termination, or continuation of the transformer oil service life. The oil incorporating cell, attached to the appropriate measuring units, could be described as a complex permittivity sensor. In this work, the acquired dielectric data from a great number of operating distribution network power transformers were correlated to corresponding physicochemical ones to demonstrate the future potential employment of the proposed measuring technique.

【 授权许可】

Unknown   
© 2005 by MDPI (http://www.mdpi.org).