Title :
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
fDate :
7/1/1994 12:00:00 AM
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;
Journal_Title :
Power Delivery, IEEE Transactions on
