| 摘要 |
FIELD: electricity.SUBSTANCE: invention relates to the field of electric engineering and may be used to recognise contamination and/or formation of dew on components of an AC frequency converter with an intermediate voltage circuit. In the method to recognise contamination and/or formation of dew, at least, during the process of preliminary charge of the intermediate circuit capacitor, having at least one capacitor, the AC frequency converter with the intermediate voltage circuit, a time characteristic is determined for the pulse current of partial discharge, besides, using this current pulse, a frequency spectrum is calculated, and depending on the result a warning is activated on contamination and/or a warning on dew formation.EFFECT: possibility to recognise extent of contamination and/or formation of dew, as a result of which a breakthrough with its impact may be prevented.5 cl |
