| 摘要 |
FIELD: electricity.SUBSTANCE: at earth fault protection of an electrical machine such as generator input signal with frequency fis delivered to the electrical machine in order to generate periodic bias voltage at a busbar of the electrical machine. The response signal is assessed in order to identify closure. Frequency of the input signal is adapted, i.e. regulated or selected depending on a system parameter or system attribute of the electrical machine specific for the system noise interacting with the response signal and overlapping it. Thus selection of non-variable preset frequency of the introduced signal is rejected in favour of a flexible approach corresponding to the very last value of the electric machine parameter.EFFECT: improving stability and reliability of the protection system.12 cl, 3 dwg |
