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Analysis of Paschen Curves for air, N2 and SF6 Using the Townsend Breakdown Equation

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2 Author(s)
Husain, E. ; Department of High Voltage Engineering Indian Institute of Science Bangalore, India ; Nema, R.S.

It has been shown that it is possible to extend the validity of the Townsend breakdown criterion for evaluating the breakdown voltages in the complete pd range in which Paschen curves are available. Evaluation of the breakdown voltages for air (pd=0.0133 to 1400 kPa · cm), N2(pd=0.0313 to 1400 kPa · cm) and SF6 (pd=0.3000 to 1200 kPa · cm) has been done and in most cases the computed values are accurate to ±3% of the measured values. The computations show that it is also possible to estimate the secondary ionization coefficient ¿ in the pd ranges mentioned above.

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Electrical Insulation, IEEE Transactions on  (Volume:EI-17 ,  Issue: 4 )