Kerr electro-optic field measurement in palm oil fatty acid ester transformer insulation system

Author

Yamamoto, S. ; Kato, K. ; Endo, F. ; Hatta, Y. ; Koide, H. ; Okubo, H.

Author_Institution

Nagoya Univ., Nagoya

fYear

2007

fDate

14-17 Oct. 2007

Firstpage

784

Lastpage

787

Abstract

A palm oil fatty acid ester (PFAE) has good insulation performance, excellent cooling ability and superior biodegradability. Recently, investigations for application of PFAE to power transformers have been started. In this paper, the electric field in PFAE was measured in situ by using Kerr electro-optic method under dc voltages application. At first, Ken-constant of PFAE was identified. Then, electric field strength E and its temporal change were measured in several PFAE / pressboard (PB) insulation systems. Electric field E in PFAE showed the capacitive distribution at the moment of dc voltage application, and decreased rapidly with time and finally the resistive field distribution was obtained. The transition time of the capacitive distribution to the resistive one and the value of E in PFAE were different from those in mineral oil. Their differences were discussed with the charge behavior in liquids, based on electro-chemical properties of the oil.

Keywords

Kerr electro-optical effect; electric variables measurement; insulation testing; organic insulating materials; power transformers; transformer oil; Kerr electrooptic field measurement; PFAE Kerr constant; PFAE biodegradability; PFAE cooling ability; PFAE electric field measurement; PFAE insulation performance; PFAE transformer insulation system; PFAE-pressboard insulation systems; dc voltage; electric field strength; palm oil fatty acid ester; power transformers; Biodegradation; Cooling; Dielectrics and electrical insulation; Electric variables measurement; Minerals; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2007. CEIDP 2007. Annual Report - Conference on

Conference_Location

Vancouver, BC

Print_ISBN

978-1-4244-1482-6

Electronic_ISBN

978-1-4244-1482-6

Type

conf

DOI

10.1109/CEIDP.2007.4451461

Filename

4451461