Park's vector approach for detection of broken rotor bars in frequency converter fed induction generator

This paper presents the experimental study of induction generator broken rotor bars diagnostics. As induction generators are often used in renewable energy applications, such as wind and hydro power plants where they are also equipped with frequency converters, diagnostics of such machines is becoming more important. Tests are performed with an induction machine with a healthy rotor and a rotor with three broken bars, supplied through a frequency converter. Park's vector approach is used as an analyzing tool to detect the broken rotor bars. Park's vector pattern using stator current and voltage is investigated. Results of the tests and discussion of the results are presented. The necessity for further study is pointed out.