Yalıtım Transformatörlerinde Ara-Harmoniklerin Transformatör Nüve Titreşimi Üzerine Etkisi

Öz

Ara-harmonikler, güç sistemlerinde doğrusal olmayan yüklerden, asenkron anahtarlamanın yapıldığı anahtarlamalı sürücülerden veya geçici durumda çalışan yüklerdeki hızlı akım değişikliklerinden kaynaklanmaktadır. Böyle çalışma koşulları altındaki transformatör nüvelerinde doymanın meydana gelmesi ve aşırı ısınma gibi problemlerin yanında titreşim seviyelerinin anormal seviyelerde artması gibi mekanik problemler de ortaya çıkmaktadır. Buna karşılık, ara-harmoniklerin yol açtığı titreşimlerdeki anormal artışın incelendiği çalışma sınırlı sayıdadır. Ara-harmoniklerin transformatör nüvesinin titreşimi üzerindeki etkilerini belirlemek amacıyla bu çalışmada bir-fazlı 10 kVA anma gücündeki bir yalıtım transformatörünün nüvesindeki titreşim yer değiştirmesi değerleri çeşitli ara-harmonik frekanslarına sahip uyarımlar altında incelenmiş ve sonuçları karşılaştırılmıştır. Yapılan benzetim çalışmalarında, ara-harmonik frekansına bağlı olarak titreşim harmonik spektrumunda yan-bantlar şeklinde veya çift katları olacak şekilde bileşenler oluştuğu ancak bazı ara-harmonik frekanslarında ise kesirli frekanslarda bileşenlerin ortaya çıkmasına yol açtığı sonucu elde edilmiştir.

Anahtar Kelimeler

• Ara-harmonik
• nüve titreşimi
• yalıtım transformatörü

The Effect of Interharmonics on Transformer Core Vibration in Isolation Transformers

Öz

Interharmonics are caused by nonlinear loads in power systems, switched drives with asynchronous switching, or rapid current changes in loads operating in a transient state. In addition to problems such as saturation and overheating of transformer cores under such operating conditions, mechanical problems such as abnormal increase in vibration levels also occur. On the other hand, few studies have examined the abnormal increase in vibrations caused by interharmonics. In this study, in order to determine the effects of interharmonics on the vibration of the transformer core, the vibration displacement values in the core of a single-phase 10 kVA rated insulation transformer were examined under excitations with various interharmonic frequencies and the results have compared. In the simulation studies, it was concluded that depending on the interharmonic frequency, components appear as sidebands or double multiples of the relevant frequency in the vibration harmonic spectrum, but in some interharmonic frequencies, it leads to the emergence of components at fractional frequencies.

Anahtar Kelimeler

• Inter-harmonic
• core vibration
• isolation transformer

Kaynakça

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