INSTRUMENT TRANSFORMER ACCURACY TESTING BY DFT METHOD

Slobodan Škundrić, Dragan Kovačević, Slobodan Mikičić
Electrical Engineering Institute “Nikola Tesla”, Belgrade, Yugoslavia

Abstract -Instrument transformer accuracy testing bythe method based on integration of DFT and virtualinstrument concept, composed of standard hardware(osciloscope, PC) and specific software is outlined. Thestructure of the realized virtual instrument for accuracy testof current transformer by DFT method is shown. Themethod has experimentally verified and compared withmeasurements made with the classical complex Hohlecompensator.

Conclusion:
The main advantages of the VI-DFTmethod are that strong, flexible and standard hardware combined withpowerful, flexible and easily changeable software, resulting,compared to the classical concept in improvedperformances, reduced cost and time of development.The experimental test performed on the realised systemshow the validity of the followed approach and very gooddegree of coicidence with classical instruments.The concept proposed and the hardware and softwarestructures presented are strong enough to support laboratoryand on-site, standard and non standard, accuracy testing ofinstrument transformer.
To view detailed information:
http://www.imeko.org/publications/wc-2003/PWC-2003-TC4-113.pdf

Comments welcomed.