New eco-friendly insulating gases have received widespread attention in the power industry due to their excellent insulating properties and low greenhouse effect. However

partial discharges in power equipment can lead to the decomposition of the new eco-friendly insulating gases and reduce their insulating properties. In order to investigate the stability of the new eco-friendly insulating gas under the discharge environment

a laser scattering detection method based on the Tyndall effect is proposed

and the relationship between the Tyndall effect and the solid decomposition products is studied. The results show that the content of decomposition products is positively correlated with the scattered light intensity

and under the same discharge conditions

the stability of C4F7N is better than that of CF3SO2F. Specifically

in a CF3SO2F/N2 gas mixture with a CF3SO2F volume fraction of 20%

the scattering light intensity of the solid product formed by discharge decomposition is 28.1 times that of C4F7N and 224.3 times that of SF6 under the same volume fraction. When the CF3SO2F volume fraction is reduced to 10%

the corresponding scattering intensities are 5.3 times and 36.0 times higher than those of C4F7N and SF6

respectively. Moreover

when the discharge duration is less than 10 s

C4F7N exhibits a level of discharge stability comparable to that of SF6. The laser scattering detection based on the Tyndall effect provides a novel method for evaluating the discharge stability of new eco-friendly insulating gases in a discharge environment.