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
fDate :
6/1/2006 12:00:00 AM
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 tandelta 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 high voltage (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 losses; frequency-domain analysis; high-voltage engineering; insulation testing; monitoring; permittivity measurement; polarisation; power transformer insulation; power transformer testing; reliability; transformer oil; dielectric liquid; dielectric loss; dielectric spectroscopy; frequency domain analysis; high-voltage power transformer oil; insulation testing; oil filled electrical equipment; permittivity; physicochemical test; polarization phenomena; reliability monitoring; Dielectrics and electrical insulation; Electrochemical impedance spectroscopy; Frequency domain analysis; Oil insulation; Permittivity; Petroleum; Polarization; Power transformer insulation; Temperature dependence; Testing;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2006.1657966
