A HAND-HELD SENSOR FOR LOCAL MEASUREMENT OF MAGNETIC FIELD, INDUCTION AND ENERGY LOSSES

G. Krismanic, N. Baumgartinger, H. Pfützner

Abstract

The present work concerns magnetic circuits which are built of laminated soft magnetic materials, e.g. cores of transformers or of rotating machines. Such systems tend to show very complex local distributions of the magnetic field vector <b><i>H</i></b>, the induction vector <b><i>B</i></b> and the energy loss <i>P</i>. For simultaneous measurements of all these local quantities, we designed a hand-held sensor which can be arranged on the surface and - taking advantage from small sensor thickness - also between the core sheets. All data are displayed instantaneously on the computer screen. The measuring method is based on search coils for the planar components of <b><i>H</i></b>, and on the needle method for the components of <b><i>B</i></b> out of the electric field vector <b><i>E</i></b>. The losses <i>P</i> are derived from the Poynting vector S = <b><i>E</i></b> &times; <b><i>H</i></b>. The sensor proves to be an effective tool, e.g. for rapid investigations of T-joint regions in transformer cores which tend to show rotational magnetization. Apart from such practical applications, the present paper is focused also on fundamental problems of the novel sensor design.

Keywords

sensors, magnetic field measurement, induction measurement, transformer cores, magnetic losses

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IMEKO-WC-2000-TC4-P140.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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