Figure 2.
The horizontal axis gives electric field strength E from 0.2 to 2.0 times 10 to the power of 7 volts per metre. The vertical axis gives current density J in amperes per square metre on a logarithmic scale. Conditions are 20 degrees Celsius, 0.6 megapascals, and 2 per cent relative humidity. The sulfur hexafluoride electric conductivity model and measurement data both increase with electric field strength. Current density rises gradually below about 0.8 times 10 to the power of 7 volts per metre, increases steeply from about 0.9 to 1.5 times 10 to the power of 7 volts per metre, then increases more slowly towards 2.0 times 10 to the power of 7 volts per metre. Measurements remain slightly above the model through most of the range and converge near the highest field strengths.Comparison of the measurement data of the current density in SF6 from Hanna et al, (2016) with the electrical conductivity model (12) multiplied with in the range [1 kV-20kV] to obtain the resulting current density with respect to the electric field
Source: Authors’ own work