Breakdown mechanism of liquid nitrogen viewed from area and volume effects
抄録
We investigated the area and volume effects on the breakdown strength in liquid nitrogen (LN_2) to discuss breakdown mechanism in cryogenic liquids for superconducting power apparatus. We measured breakdown voltages in LN_2 with and without thermal bubbles over a very wide range of the electrode size. Experimental results revealed that breakdown mechanism changed from area dominant to volume effective region at the larger electrode configurations LN_2. Moreover, we discussed the contribution rate of area and volume effects appeared in breakdown characteristics in LN_2 under thermal bubble condition, as a phenomenon peculiar to cryogenic liquids. Consequently, we pointed out that it is very important to consider both thermal bubbles and electrode surface condition for HV insulation of superconducting power appartus.
収録刊行物
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- IEEE Transactions on Dielectrics and Electrical Insulation [see also IEEE Transactions on Electrical Insulation]
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IEEE Transactions on Dielectrics and Electrical Insulation [see also IEEE Transactions on Electrical Insulation] 4 (1), 127-134, 1997-02
IEEE