Space charge behavior in palm oil fatty acid ester (PFAE) by electro-optic field measurement

For power transformer insulating oil, we focused on palm oil fatty acid ester (PFAE). It has satisfactory insulating performance, excellent cooling ability and superior biodegradability. Recently, investigations for application of PFAE to environment-friendly power transformers installations have be...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2009-12, Vol.16 (6), p.1566-1573
Main Authors: Kato, K., Nara, T., Okubo, H., Endo, F., Yamazaki, A., Koide, H., Hatta, Y., Hikosaka, T.
Format: Article
Language:English
Subjects:
Charge
Charge measurement
Cooling
Current measurement
Electric field
Electric fields
Electric potential
Electric power generation
Electric variables measurement
Esters
Fatty acids
Kerr electro-optic measurement
Minerals
Oil flow
Oil insulation
Palm oil
Palm oil fatty acid ester (PFAE)
Petroleum
Power transformer insulation
Power transformers
Pressboard
Space charge
Studies
Transformers
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Summary:For power transformer insulating oil, we focused on palm oil fatty acid ester (PFAE). It has satisfactory insulating performance, excellent cooling ability and superior biodegradability. Recently, investigations for application of PFAE to environment-friendly power transformers installations have been started. In this paper, the space charge behavior in PFAE was investigated from the measurement results of the electric field by using Kerr electro-optic method under dc voltages applications. For the field measurement, the Kerr constant of PFAE was identified first. Then, the electric field strength and its temporal change were measured in several PFAE / pressboard (PB) insulation systems. The electric field in PFAE was determined by the capacitive distribution at the moment of the voltage application, and decreased rapidly with time and reached the steady state determined by the resistive distribution. The transition time of the capacitive distribution to the resistive one and the strength of electric field in PFAE were much different from those in mineral oil. The influence of oil flow on the time transition of the electric field was also measured. Their differences were discussed with the charge behavior in liquids, based on electro-chemical properties of the oil. We discussed the difference of the flow electrification characteristics between PFAE and mineral oil, and its mechanism was discussed based on the charge behavior in oils.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2009.5361576