of;
Electrical;
Engineering,;
Beneficent;
Association;
of;
Santa;
Catarina;
Coal;
Industry;
(SA;
TC),;
Cricifima-Sc,;
Brazil;
of;
Engineering,;
Federal;
University;
of;
Rio;
Grande;
do;
Sul;
(UFRGS),;
Porto;
Alegre-Rs,;
Brazil;