Arco elétrico e energia incidente em sistemas elétricos industriais

Abstract

Although the massive use of electricity in industry began at the end of the 19th century, the first electric arc thermal effects estimating method was only proposed in the 1980s. In the following decades, several works contributed to increase the knowledge about the phenomenon and to improve the methods to quantify it. The IEEE Std 1584 first edition was published in 2002, being the first incident energy calculation dedicated technical standard. This standard, which has become the industry most popular method, had its second edition published at the end of 2018, with significant changes. A new mathematical model was proposed, including parameters that were not measured before, in addition to long equations, which manual calculation may be considered impractical. In this context, this work presents an IEEE Std 1584-2018 method incident energy calculation script development and its application in two case studies. The first case study illustrates the parameter evaluation to carry out a low voltage controlgear incident energy study, ending with a comparison between the 2018 Edition results with those of the 2002 Edition. The second case study proposes a roadmap for carrying out an incident energy dynamic study that considers multiple sources and the rotating machines short-circuit contribution ac decrement, concluding with a comparison between the results considering the ac decrement with the results in which it is neglected, and a discussion of the situations in which the effort to carry out a dynamic study can be justified.