Dynamic Balancing between Thermal -Field Emission Currents of Series-connected Vacuum Gaps
The objective of this paper is to study thermal- field emission during prebreakdown process of series-connected vacuum gaps. Thermal-field emission of a microtip on cathode surface of on single vacuum gap was calculated via the MurphyGood theory considering the Nottingham effect, space charge and na...
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Published in | 2023 30th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) pp. 721 - 724 |
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Main Authors | , , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEJ
25.06.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The objective of this paper is to study thermal- field emission during prebreakdown process of series-connected vacuum gaps. Thermal-field emission of a microtip on cathode surface of on single vacuum gap was calculated via the MurphyGood theory considering the Nottingham effect, space charge and nano-scale curvature radius. Then through the bidirectional coupling of the aforementioned model and circuit model, thermal-field emission current of series-connected vacuum gaps was calculated. Results showed that a selfbalancing process that emission currents of series-connected vacuum gaps tend to be consistent existed during the prebreakdown process. This explains the astonishing synchronicity on breakdown instant of the series-connected vacuum gaps that was sometimes observed. However, time to reach a balanced emission current could be prolonged by adopting grading capacitors in parallel with the vacuum gaps. This explains the high probability of asynchronous breakdowns observed for series-connected vacuum gaps under lighting impulse voltage. |
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ISSN: | 2471-786X |
DOI: | 10.23919/ISDEIV55268.2023.10200790 |