COSTA, E. G.; http://lattes.cnpq.br/3930289115658143; COSTA, Edson Guedes da.
Resumen:
Zinc oxide(ZnO)-based surge arresters are applied in electric power systems as protection
against overvoltages. The surge arresters limited the voltage peaks by transforming a part of the
electrical energy into thermal energy. The electro-thermal performance of ZnO surge arresters
has been studied during normal and abnormal service conditions and during laboratory tests.
For this purpose, an electro-thermal model has been proposed which initially computes the
energy input to the ZnO arrester for a given applied voltage. Subsequently, the computational
model determines the temperature distribution and its temporal variation by means of the
implicit formation of the method of finite differences.
The electro-thermal computational model has been used to study the performance of a
complete surge arrester and of a prorated section when subjected to laboratory tests. The
computed temperature distributions and their time variations have been compared with
experimental measurements. The good agreement between computed and measured results
validates the electro-thermal model.
The computational model has then used to study the performance of a hypothetical surge
arrester configuration and a prorated section of this configuration. The model is able to predict
the behaviour of the surge arrester during standard laboratory tests.