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Ferroresonance is an electrical phenomenon in nonlinear character, which frequently occurs in power systems containing saturable transformers and single or more-phase switching on the lines for the disjunction of the loads. In this study, the ferroresonance phenomena are considered under the modeling of the West Anatolian Electric Power Network of 380 kV in Turkey. The ferroresonance event is carried out using the switching to remove the loads at the end of the lines. In this sense, two different cases are considered. Firstly, the switching is applied at the 2nd second and the ferroresonance effects are observed between the 2nd and the 4th second of the voltage variations. As a result, the ferroresonance and non-ferroresonance cases observed before the ferroresonance, are compared with each other using the Fourier transform techniques. Hence, the properties of the ferroresonance event, which are defined between the 100 and 200 Hz, are presented in the frequency domain. Ferroresonance is an electrical phenomenon in nonlinear character, which frequently occurs in power systems containing saturable transformers and single or more-phase switching on the lines for the disjunction of the loads. In this study, the ferroresonance phenomena are considered under the modeling of the West Anatolian Electric Power Network of 380 kV in Turkey. The ferroresonance event is carried out using the switching to remove the loads at the end of the lines. In this sense, two different cases are considered. Firstly, the switching is applied at the 2nd second and the ferroresonance effects are observed between the 2nd and the 4th second of the voltage variations. As a result, the ferroresonance and non-ferroresonance cases observed before the ferroresonance, are compared with each other using the Fourier transform techniques. Hence, the properties of the ferroresonance event, which are defined between the 100 and 200 Hz, are presented in the frequency domain.

In this study, a current drawn by a welter at initial, stable-state and finish modes is examined using spectral analysis. The current shunt measurement method is utilized in order to measure the current drawn by the welter. The study involves the examination of welding stages of a material with the electrode of a welter. First, the current drawn by the welter is measured in the initial mode of the welding process. Then the current value during the stable-state mode of the welding process is measured. Finally, the current drawn at the finishing mode of the welding process is measured. Fast Fourier Transform (FFT) of all these measured current values are calculated and spectral analysis is performed using these transforms. During the study, it is observed that current drawn by the welter during these three modes of welding are different from each other. For each mode, frequency domain analysis of the measured current is performed.

Ferroresonance is an electrical phenomenon in nonlinear character, which frequently occurs in power systems containing saturable transformers and single or more phase switching on the lines for the disjunction of the loads. In this study, the ferroresonance phenomena are considered under the modeling of the West Anatolian Electric Power Network of 380 kV in Turkey. The ferroresonance event is carried out using the switching to remove the loads at the end of the lines. In this sense, two different cases are considered. Firstly, the switching is applied at the 2nd second and the ferroresonance effects are observed between the 2nd and the 4th second of the voltage variations. As a result, the ferroresonance and non-ferroresonance cases observed before the ferroresonance, are compared with each other using the Fourier transform techniques. Hence, the properties of the ferroresonance event, which are defined between the 100 and 200 Hz, are presented in the frequency domain. Ferroresonancia é um fenômeno elétrico em caráter nãolinear, o que freqüentemente ocorre em sistemas de potência contendo transformadores saturável, e mudar uma ou mais fases nas linhas de separação das cargas. Neste estudo, os fenômenos de ferroresonancia são considerados sob a modelagem da Anatólia do Oeste Rede de Energia Elétrica de 380 kV, na Turquia. O ferroresonancia ocorre utilizando a mudança para remover as cargas, no final das linhas. Nesse sentido, dois casos são considerados diferentes. Em primeiro lugar, a mudança é aplicada em 2 segundos e os efeitos de ferroresonancia são observados entre segundos 2 e 4. Como resultado, o ferroresonance e casos ferroresonancia não observado antes da ferroresonancia são comparados uns com os outros usando a transformada de Fourier técnicas. Assim, as propriedades da ferroresonancia, que são definidas entre os 100 e 200 Hz, são apresentadas no domínio da freqüência.