Modelo adaptativo de para-raios de óxido de zinco para a região de baixa corrente.

Abstract

In this work it is shown a zinc oxide surge arrester adaptive model (ZnO) for the region of low current. The proposed model includes the entire region of low current. To construct the model it is necessary to carry out tests of characterization in surge arresters. At the test, measurements of voltage and total leakage current for several voltage levels must be done, from zero volts to the rated voltage of the surge arrester. After the measurement data acquisition, the leakage current of the ZnO surge arrester in the region of low current must be decomposed in its resistive and capacitive components, more accurately, considering the voltage harmonic components. The technique is based on the capacitance estimation of the ZnO surge arrester and for this it was used a computational algorithm. The results obtained through the proposed methodology were compared with other decomposition methods of the ZnO surge arrester leakage current. Based on the results from the application of the proposed methodology for the leakage current decomposition, it is generated the ZnO surge arrester model for the region of low current. The results from the application of the proposed model were compared with the conventional model results. Using the proposed model the results were considered more faithful to the measured data.