Transformer winding defects identification based on a high frequency method

Transformer winding defects identification based on a high frequency method

frequency response analysis method is most frequently used technique employed to detecting fault of inductive apparatus. expecially for faults that are not so much significant but may enlarge in a certain period of time.

Below is an abstract from an article, I find that is a good representation of similar method.

Abstract. The transformer diagnostic methods are systematically being improved and extended due to growing requirements for reliability of power systems in terms of uninterrupted power supply and avoidance of blackouts. Those methods are also driven by longer lifetime of transformers and demand for reduction of transmission and distribution costs. Hence, the detection of winding faults in transformers, both in exploitation or during transportation is an important aspect of power transformer failure prevention. The frequency response analysis method (FRA), more and more frequently used in electric power engineering, has been applied for investigations and signature analysis based on the admittance and transfer function. The paper presents a novel approach to the identification of typical transformer winding problems such as axial or radial movements or turn-to-turn faults. The proposed transfer function discrimination (TFD) criteria are based on the derived transfer function ratios, manifesting higher sensitivity.

Print publication: Issue 9 (September 2007)Received 27 December 2006, in final form 8 June 2007Published 20 July 2007
Marek Florkowski1 and Jakub Furgał21 ABB Corporate Research, 31-038 Kraków, ul. Starowiślna 13A, Poland2 Electrical Power Institute, AGH University of Science and Technology 30-059 Kraków, al. Mickiewicza 30, PolandE-mail: marek.florkowski@pl.abb.com and furgal@uci.agh.edu.pl

In consideration of the basic techniques for the defects identification, I am also very interested in the frequency-vary power source, of how much power output should be considered in order to assure the accuracy of test....

Discuss welcomed.