Gases for Tracers and Ionization Control in Gas-Filled Cables

This paper presents the results of an investigation conducted over several years on the effect of various gases on cable insulation. Based on highly accelerated load cycle testing, it is concluded that certain odorant gases and halogenated gases can be used with little risk of cable degradation. Data are also presented which show that the substitution of high dielectric strength gas for nitrogen in gas pressure cable will permit operation at normal pressure with higher factor of safety or ionization-free operation at lower pressures. Included in the Appendix is a summary of leak detection methods, their application and effectiveness.