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Frequency converter and method for identifying and blocking a fault current in a frequency converter
Frequency converter and method for identifying and blocking a fault current in a frequency converter
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机译:变频器以及在变频器中识别和阻止故障电流的方法
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摘要
In a frequency converter operated for safety of personnel and/or fire protection via a ground fault interrupter is frequently not able to distinguish between an actual fault current and an operationally generated leakage current. The proposed method addresses this problem by determining a course of a magnitude of a current flowing through the frequency converter, predefining a signal portion which is independent of switching processes within the frequency converter while the frequency converter operates fault-free, checking whether the determined course satisfies a criterion that is predetermined depending on the signal portion, and interrupting the current the determined course fails to satisfy the predetermined criterion.
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