Proteção de Sistema Fotovoltaico Conectado a Rede Elétrica

The electric sector and the solar energy are currently growing, especially when it comes to distributed generation. According to the ANEEL Resolution 482, it is possible to separate the distributed generation into microgeneration and Minigeneration. Resolutions 482 and 687 make it clear that the distributed generation market has grown significantly (mainly in the photovoltaic systems). However, the wide range of regulations regarding the direct current installations of the Brazilian photovoltaic system is generating errors during the protection projects. Until NBR 16690 is published, NBR 5410 should be the regulation used, which contains DC installations of up to 1500V. There is also NBR5419, which regulates the need of grounding the exposed conductive parts of the photovoltaic array, in order to protect it against outbreaks caused by atmospheric discharges. With this vision of the electric sector and analyzing the growing number of installations being carried out, this article aims to inform and clarify the main doubts regarding the design of its protections for the installations in direct current. Key-words: protection of photovoltaic systems; distributed generation; protection systems for photovoltaic installations Proteção de Sistema Fotovoltaico Conectado a Rede Elétrica