Event under the auspices of the Ministry of Economy of Slovak Republic

Measurement of transformer harmonic no-load current spectrum using magnetic field spectral analysis

Jozef Bendík
Institute of Power and Applied Electrical Engineering Facult


     Last modified: 2017-06-12

Abstract
This paper presents a noninvasive and galvanic contactless method for the measurement of the harmonic current spectrum. The purpose of this research is to evaluate the simple and fast method of transformer diagnostics and software modeling. Advantages of using this method can be found in situations where contactless methods are preferred. Method is based on spectral analysis of superposed magnetic fields produced by transformers coils. The evaluation of this approach has been done by experimental measurement and by comparing the data of the current spectrum from each coil of the transformer and the magnetic field spectrum measured in one point of the observer in the vicinity of the power transformer in the same time. All measurements have been made on transformer 220/110 kV in no-load state. The results show a high correlation between current harmonics and the magnetic field harmonic spectrum. However, the conditions such as geometry and measurement position are not negligible and must be chosen optimally.

 

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