This abstract illustrates differential protection philosophy for Power Transformer (PT) in the presence of non-linear loads, using combined Discrete S-Transform (DST) and Support Vector Machines (SVMs) methods. Discrimination between internal fault and magnetizing inrush condition is a very challenging task in PT differential protection scheme. Therefore, discrete s-transform is used to extract the time and frequency division information simultaneously from the relaying signal (i.e. differential current) and then the different features like peak, rms and difference between different entities of rows from discrete s-transformed decomposed amplitude and phase matrices in terms of information of the original signal. And then these features of the relaying signal are used to train and test the SVM to detect internal fault. The PT is modelled in PSCAD/EMTDC software to obtain the relaying under different operating conditions. The proposed algorithm is evaluated in MATLAB under different operating conditions of PT and the tested data is simulated in PSCAD/EMTDC by varying inception angle, fault location, loading conditions of PT.
Power Transformer (PT), Discrete S-transform (DST), Short Time Fourier Transform(STFT), Support vector machine(SVM)
Sristi Shukla , Vivek Bargate "Review On Power Transformer Protection Scheme With Non-Linear Load " Iconic Research And Engineering Journals Volume 2 Issue 10 2019 Page 94-102
Sristi Shukla , Vivek Bargate "Review On Power Transformer Protection Scheme With Non-Linear Load " Iconic Research And Engineering Journals, 2(10)