A comparative evaluation of cost/ benefit analysis with lightning impulse breakdown strength of binary and ternary gas mixtures containing SF_6 in non-uniform field gaps

摘要

SF_2 it still expensive than other commonly used dielectrics, and is very sensitive to local field enhancements which are investable in engineering applications because of the electrode surface defects, sharp edges and presence of free conducting particles. In the most commonly used pressure range, SF_6 retains only one half of its potential dielectric strength for practical electrode finishes. A properly selected additive in ternary gas mixtures can effectively enhance the corona stabilization effect of the binary mixtures (SF_6 /N_2 and SF_6 / CO_2) in highly non uniform fields and thus increase its breakdown voltage within the corona stabilization region.