Motor Akım İmza Analizinde Park Dönüşümüyle Temel Harmonik Bastırımı / Fundamental Harmonic Suppression in MCSA by Park Transformation

Özet Asenkron motorlarda kırık rotor çubuğu arızalarının stator akımları incelenerek tespiti için uygulanan işaret işleme yöntemlerinde, şebeke temel frekansının arıza frekansına oranla çok büyük ve frekansların biribirine yakın olması hatanın tespitinde büyük zorluk oluşturmaktadır. Bu zorluğu aşmak için, şebeke temel frekansını bastırmada çentik süzgeçleri (notch filters) yaygın şekilde kullanılmaktadır. Bu şekilde yapılan süzgeçleme hem daha fazla hesap gerektirmekte hem de bazı durumlarda şebeke temel frekansına yakın olan arıza frekans değerlerini de bastırmaktadır. Bu çalışmada stator d-ekseni bileşenini elde etmek için faz akımlarına uygulanan Park dönüşümüyle temel frekans bastırılmaktadır. Asenkron motorlarda oluşan kırık rotor çubuğu arızalarının tespiti için stator akımının d-ekseni bileşeni üzerinde dalgacık paketi ve Fourier analizleri yapılması önerilmektedir. Abstract Broken rotor bar detection via analysis of line currents is very difficult since frequency of faulty component is very close to system fundamental frequency and the magnitudes of fault signals are very small compared to the dominant magnitude of fundamental frequency. To overcome this difficulty, notch filters are used in general to suppress the fundamental. This type of filtering requires more computation and it also affects the magnitudes of fault related frequency components since they are very close to the fundamental. In this study, the Park`s transformation is applied to the phase currents in obtaining stator d-axis component to block out the fundamental frequency. Wavelet packet and Fourier analyses of d-axis component of motor stator current is proposed for broken rotor bar detection.

Anahtar Kelimeler:

Asenkron Motorlar, Kırık Rotor Çubuğu ve Park Dönüşümü, Induction Motors, Broken Rotor Bars, Park Transformation

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