Title :
DC magnetisation of transformers
Author :
Ahfock, A. ; Hewitt, A.J.
Author_Institution :
Fac. of Eng. & Surveying, Univ. of Southern Queensland, Toowoomba, Qld.
fDate :
7/1/2006 12:00:00 AM
Abstract :
A sufficiently high DC component in the current on the secondary side of a transformer causes distortion of the primary side current. Prediction of such distortion relies on the availability of magnetisation curves that extend deep enough into saturation. A simple test, carried out at rated voltage, is proposed which allows the magnetisation curve to be deduced from measured data. In addition, a systematic procedure has been developed to evaluate the primary-current distortion in both single- and three-phase transformers. Comparison between theoretical predictions and practical measurements are made, with reasonable agreement between the two
Keywords :
magnetic hysteresis; nonlinear distortion; transformer cores; transformer magnetic circuits; DC magnetisation; magnetisation curves; magnetising-current distortion; primary side current distortion; secondary transformer side; single-phase transformers; three-phase transformers;
Journal_Title :
Electric Power Applications, IEE Proceedings -
