Analysis of an anisotropic nonlinear electric field with a discussion of dielectric tests for converter transformers and smoothing reactors

Author

Takahashi, E. ; Shirasaka, Y. ; Okuyama, K.

Author_Institution

Hitachi Med. Corp., Kashiwa, Japan

Volume

9

Issue

3

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1480

Lastpage

1486

Abstract

Oil-immersed insulating materials have anisotropic and nonlinear conductivity. A new calculating method for the electric field in such materials is developed for the insulation design of power converter transformers and smoothing reactors. Flashover voltages estimated from the results very closely approximate measured values. Dielectric test methods are discussed based on calculated electrical stress in each part of the power converter transformers for various applied voltages. Alternative tests are proposed instead of the combined AC-DC voltage and polarity reversal tests

Keywords

electric breakdown of liquids; electric fields; flashover; insulating oils; insulation testing; power convertors; power transformers; reactors (electric); transformer insulation; transformer testing; anisotropic nonlinear electric field; electrical stress; flashover; insulation design; oil-immersed insulating materials; power converter transformers; smoothing reactors; Anisotropic magnetoresistance; Conducting materials; Conductivity; Dielectric materials; Dielectrics and electrical insulation; Inductors; Oil insulation; Power transformer insulation; Smoothing methods; Testing;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.311221

Filename

311221