Abstract
The effects of forced-flowing liquid nitrogen on (1) breakdown voltage of liquid nitrogen, (2) surface flashover voltage along polymeric rod immersed in liquid nitrogen, and (3) lifetime to breakdown of polymeric film by partial discharges in liquid nitrogen were examined. Breakdown voltage of forced-flowing liquid nitrogen was a little higher than that of liquid nitrogen flowing without force. A slight increase of surface flashover voltage along acrylic rods was observed in forced-flowing liquid nitrogen. Lifetime to breakdown of polyethylene film subjected to partial discharges is longer in forced-flowing liquid nitrogen. Considering the results of partial discharge measurements, the phenomena may be attributed to restraint of the propagation of discharges by forced-flowing liquid nitrogen. © 2000 Scripta Technica, Electr Eng Jpn, 132(3): 1–7, 2000
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