Method for identifying dirt and/or dew on components of a voltage intermediate circuit converter

摘要

The invention relates to a method for identifying dirt and/or dew on components of a voltage intermediate circuit converter. According to the invention, the temporal curve of a partial discharge pulsed current is detected at least during a precharging process of an intermediate circuit capacitor of the voltage intermediate circuit converter comprising at least one capacitor, wherein a frequency spectrum is calculated from said current pulse, and wherein depending of the result, a dirt warning and/or a dew warning is activated. Thus, the degree of dirt and/or dew of said voltage intermediate circuit converter can be determined at least during a charging process of an intermediate circuit capacitor of a voltage intermediate circuit converter, thereby preventing a breakdown including the consequences thereof.

主权项

1. A method for identifying contamination and/or condensation on components of a voltage intermediate circuit converter, comprising the steps of:
pre-charging an intermediate circuit capacitor of the voltage intermediate circuit converter, which comprises at least one capacitor, with a stepwise increasing voltage, measuring a temporal curve of a partial discharge pulsed current at each voltage step of the stepwise increasing voltage, computing a frequency spectrum for said pulsed current, and activating, depending on the computed frequency spectrum, at least one of a contamination warning and a condensation warning.