access icon free Inductance inrush current time–frequency analysis

© The Institution of Engineering and Technology
Received 21/01/2019, Accepted 24/09/2019, Revised 01/08/2019, Published 26/09/2019

This study presents an application of the reassigned Gabor time–frequency transform to the inductance inrush current transient analysis. Measurement setup is constructed and the measurement methodology is presented to obtain fully controlled transformer inrush current measurements. The measured data is analysed by the reassigned Gabor time–frequency transform. The resulting time–frequency distribution of the measured signal shows how inrush DC component and harmonics change with time for different initial conditions. By extracting the stationary points from the reassigned Gabor transform, an algorithm for computing the time duration of the inrush is presented and applied to 88 measured transients.

Inspec keywords: transient analysis; power transformers; time-frequency analysis; electric current measurement; transients

Other keywords: 88 measured transients; current transient analysis; measurement setup; measurement methodology; fully controlled transformer inrush current measurements; resulting time–frequency distribution; inductance inrush; reassigned Gabor time–frequency; current time–frequency analysis; harmonics change; reassigned Gabor transform

Subjects: Transformers and reactors; Mathematical analysis; Integral transforms; Current measurement; Signal processing and detection

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