インバータサージ電圧下の課電寿命特性

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  • Lifetime Characteristics of Electrical Insulation in Motor Fed by Inverter
  • インバータサージ デンアツ カ ノ カデンジュミョウ トクセイ

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説明

We studied the effect of inverter surge voltage for high voltage electrical insulation by using steep fronted and high frequency high voltage pulse generator and model bar coils. In this experiment, we investigate the lifetime and partial discharge characteristics of insulation under surge voltage with various risetime, pulse width, magnitude and polarity. In these results we found little difference on insulation lifetime applying surge voltage with 1μs risetime , between 10μs and 100μs pulse width, compared with lifetime of conventional sine voltage under the same peak voltage and repetitive frequency. We also found the polarity effect of surge added in AC voltage for insulation lifetime is little, but the lifetime of insulation decreases with the magnitude of surge added in AC voltage even if under the same voltage peak applied. These results are discussed with partial discharge characteristics and it is found that it is necessary that the peak voltage of inverter is smaller than that of sine voltage, magnitude of surge is smaller than 1/4 of the peak to peak voltage and repetitive frequency is lower than 1kpps at least if we get the almost same lifetime of motor insulation supplied by sine voltage.

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