Διερεύνηση της δυνατότητας αύξησης της διηλεκτρικής αντοχής ανομοιογενών διάκενων: σμίκρυνση διάκενων γραμμών υψηλών τάσεων
Abstract
The breakdown mechanism was investigated for two non-homogenous gaps, a conductor-plane gap and a conductor-rod one of 50 cm length under composite voltage, hence applying impulse voltage on the conductor and negative direct voltage on the plane or the rod. The results were compared with the same gaps when the plane or the rod was earthed. The purpose was to investigate the influence of the applied impulse voltage on the rod, the diameter of the rod, the applied DC voltage and the absolute humidity in the voltage breakdown distribution. The parameters influencing the breakdown mechanism are clarified with accent in the absolute humidity. For the conductor-rod gap the negative pre-stress of the rod results in a significant increase of the dielectric strength even doubling the voltage breakdown in conjunction with the rod position regarding the conductor lead of the impulse voltage. This effect depends upon the DC corona extend on both electrodes and can be observed beyond a certain valu ...
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