A method for synergistic effect evaluation of SF6/N2 gas mixtures

A new method was introduced to evaluate and analyze synergistic effect including negative synergistic effect of SF
₆
/N
₂
gas mixtures breakdown voltage. This method provides an intuitional comparison among different degree of synergistic effect through a simple equation of the normalization coefficient h. The disadvantages of traditional method, which fails to evaluate negative synergistic effect and would be inaccurate when breakdown voltages of the two gas compositions are close, are overcome via the method. In this paper, a typical example of the above is shown to analyze synergistic effect and abnormal negative synergistic effect of SF
₆
/N
₂
gas mixtures in non-uniform electric field under lightning impulse. Meanwhile the validity of the normalization coefficient h with the synergistic effect of SF
₆
/N
₂
gas mixtures under various voltage conditions and electrodes in references was verified.