Title :
Temperature dependent dielectric spectroscopy in frequency domain of high-voltage transformer oils compared to physicochemical results
Author :
Paraskevas, C.D. ; Vassiliou, P. ; Dervos, C.T.
Author_Institution :
Sch. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Greece
Abstract :
The temperature dependent dielectric spectroscopy in frequency domain is compared to physicochemical and electrical tests that are periodically applied on highly insulating transformer oils. Complex permittivity and tanδ data are obtained as a function of frequency and operation temperatures, to demonstrate the polarization phenomena and the induced loss intensification by the thermally stimulated currents. The acquired dielectric data of oil samples collected from 201 operating HV power transformers, were correlated to their corresponding physicochemical ones in order to demonstrate the future potential employment of the proposed measuring technique in the field of high voltage engineering towards reliability monitoring of oil filled electrical equipment (OFEE).
Keywords :
dielectric materials; frequency-domain analysis; monitoring; permittivity; power transformer insulation; reliability; spectroscopy; transformer oil; complex permittivity; frequency domain; high-voltage transformer insulating oils; oil filled electrical equipment; physicochemical results; polarization phenomena; reliability monitoring; temperature dependent dielectric spectroscopy; Dielectrics and electrical insulation; Electrochemical impedance spectroscopy; Frequency domain analysis; Oil insulation; Permittivity; Petroleum; Polarization; Power transformer insulation; Temperature dependence; Testing;
Conference_Titel :
Dielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8954-9
DOI :
10.1109/ICDL.2005.1490081
