TY - JOUR

T1 - Benchmarking the calculation of electrically insulating properties of complex gas mixtures using a multi-term Boltzmann equation model

AU - Flynn, M.

AU - Neuber, A.

AU - Stephens, J.

N1 - Publisher Copyright:
© 2021 IOP Publishing Ltd.

PY - 2021/1/6

Y1 - 2021/1/6

N2 - The accurate calculation of DC breakdown voltage thresholds solely from elementary electron-neutral interactions in complex gas mixtures using a multi-term Boltzmann equation (BE) kinetic model is demonstrated. SF6:N2 mixtures in the 100 Td < E/N < 400 Td field regime are explored to benchmark the model's effectiveness. A ten-term BE model is found to yield DC breakdown voltages which, on average, agree within 3% of experimental measurements. A two-term BE model is also applied in order to characterize the error introduced in all calculations by the two-term approximation. These discrepancies are largest in pure N2 where error is greater than 10% for diffusion coefficients, within 6% for particular vibrational rate coefficients, and within 5% for breakdown voltages. However, this error falls to within 1% for most parameters and breakdown voltages in mixtures with large SF6 content.

AB - The accurate calculation of DC breakdown voltage thresholds solely from elementary electron-neutral interactions in complex gas mixtures using a multi-term Boltzmann equation (BE) kinetic model is demonstrated. SF6:N2 mixtures in the 100 Td < E/N < 400 Td field regime are explored to benchmark the model's effectiveness. A ten-term BE model is found to yield DC breakdown voltages which, on average, agree within 3% of experimental measurements. A two-term BE model is also applied in order to characterize the error introduced in all calculations by the two-term approximation. These discrepancies are largest in pure N2 where error is greater than 10% for diffusion coefficients, within 6% for particular vibrational rate coefficients, and within 5% for breakdown voltages. However, this error falls to within 1% for most parameters and breakdown voltages in mixtures with large SF6 content.

KW - Boltzmann equation

KW - high voltage discharge

KW - sulfur hexafluoride

UR - http://www.scopus.com/inward/record.url?scp=85117715224&partnerID=8YFLogxK

U2 - 10.1088/1361-6463/ac29e7

DO - 10.1088/1361-6463/ac29e7

M3 - Article

AN - SCOPUS:85117715224

SN - 0022-3727

VL - 55

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

IS - 1

M1 - 015201

ER -