BRITO, V. S.; http://lattes.cnpq.br/7658247097976690; BRITO, Valdemir da Silva.
Resumo:
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.