Resumo:
Shunt reactors in high-voltage and extra high-voltage, have historically been
manufactured using oil-immersed iron core technology, mainly due to issues related to
the insulation of the reactor windings. However, with the improvement of the insulating
films as well as on the manufacturing techniques, it has been possible the
manufacturing of these equipment using dry-type air core technology, which has
demonstrated to be efficient, environmentally friendly and, in many cases, with lower
costs in short, medium and long-term basis. It is required therefore, the study of which
are the changes when it is adopted this air core technology, which has been the more
and more accepted on worldwide market. The main aspects regarding the application
of these equipment are disclosed, stablishing a parallel between both technologies,
with regards to the construction aspects, the viability of replacement (which are the
cases at which they are or not indicated), the losses comparison, all the precautions
and remarks in terms of magnetic field, the protection and the transients aspects
(including a study case of two identical equipment in both technologies, with
calculations and simulations of transient frequency and voltage, TRV and RRRV, as
well as a percentage comparative analysis between the calculated and simulated
results). These comparisons, aim to contribute with technical community and the global
trend in adopting dry-type technology, highlighting the main differences and
particularities to be considered when replacing traditional type.
