Title :
Impulse testing of power transformers - a model reference approach
Author :
Arunkumar, S. ; Sandeep, V. ; Shankar, S. ; Gopalakrishnan, M. ; Udayakumar, K. ; Jayashankar, V.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol., Madras, India
Abstract :
An objective classification of faults that can occur during impulse tests on power transformers is proposed. It includes nonlinear elements, breakdown, and partial discharge events. An analysis of a layer winding, in the time and frequency domains, with these faults shows that current assessment methods must be used with caution. A model reference approach is proposed to distinctly improve recognition in such cases. The method is immune to changes of wave shape and the instant of fault is available by observation.
Keywords :
discharges (electric); failure analysis; fault diagnosis; power transformer testing; time-frequency analysis; transient response; breakdown; failure analysis; fault classification; fault recognition; layer winding analysis; model reference analysis; nonlinear elements; partial discharge events; power transformer impulse testing; time/frequency domain analysis;
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
DOI :
10.1049/ip-smt:20030761
