Experimental modelling of electrical winding to analyse the stress on the winding in frequency domain

Inhalt:
In this paper, a distributed frequency-dependent electrical model of the winding is presented. This model can be used to analyse asymmetrical electrical voltage distribution in electrical windings and also in transformers. Additionally, an analysis method is presented to calculate the voltage between turns (turn-to-turn voltage) and the voltage between turns and the enclosure (turn-to-reference voltage) at frequency domain. The presented model and method are validated in two tests. In the first test, the input impedance of a self-wound air-core winding is calculated and measured in the frequency domain, and the measured and calculated results are compared. In addition, the voltage at a specific turn of the winding is measured and calculated based on the introduced method. In the second test, the impedance of another winding with an iron core is measured and calculated in the frequency domain. The analysis of the calculated and measured results for both tests shows an acceptable compatibility.