Experimental Test Bench for Power Transformer Differential Protection Testing Methods Evaluation

Document Type

Conference Proceeding

Publication Date



Department of Electrical and Computer Engineering


This paper presents an experimental test bench for generating disturbances in a transformer to validate power transformer differential protection methods. The experimental setup uses a 1 kVA three-phase transformer with accessible taps in its windings to generate challenging inter-turn faults. Moreover, external faults and transformer energizations with and without a permanent fault were also generated in this experiment. This paper evaluates the performance of traditional phasor-based and wavelet-based differential protection methods with representative transformer events obtained in the laboratory. Both methods performed well. However, the wavelet-based method was the fastest, even considering a high level of noise. The coherent results highlight the feasibility of using the experimental setup as a valuable step for validating differential protection methods based on the ampere-turn balance.

Publication Title

IEEE Power and Energy Society General Meeting