A NEW ROGOWSKI-COIL WITH STRAIGHT PART-CO ILS

Contents The modern electronic protection and measuring equipments of the heavy-current engineering need voltage signals on their inputs, th e momentary value of which is proportional to the current to be measur ed in the range of the short circuit current (including the transmissi on of the direct current component), too. The traditional iron core-ty pe current transformer does not comply with these requirements. The ai r core-type current transformers (Rogowski-coils) would be correctly a pplicable on the basis of their linear transmission, but their propaga tion was being hindered by the manufacturing problems of the measuring coil. New simply producible measuring coils made of straight axis par t-coils have been theoretically investigated. Three error-parameters w ere introduced for the qualification of accuracy. Optimal parameters c ould be chosen on the basis of the relations between the geometrical a nd the error parameters. These ideal measuring coils comply with the r equirement both of the high accuracy and of the simple manufacturing. Moreover, they will make possible the wide industrial application of t he new current transformer without iron core.