Figure 3.
The horizontal axis gives pressure P from about 0.1 to 1.1 megapascals. The vertical axis gives current density J from 10 to the power of negative 12 to 10 to the power of negative 10 amperes per square metre on a logarithmic scale. Conditions are 20 degrees Celsius, 6 kilovolts per millimetre, and 2 per cent relative humidity. The sulfur hexafluoride electric conductivity model increases steadily from about 8 times 10 to the power of negative 12 amperes per square metre at 0.1 megapascals to about 7 times 10 to the power of negative 11 amperes per square metre at 1.1 megapascals. Measurement values occur near 6 times 10 to the power of negative 12 at 0.1 megapascals, 5 times 10 to the power of negative 12 at 0.3 megapascals, 1.5 times 10 to the power of negative 11 at 0.5 and 0.7 megapascals, 3.5 times 10 to the power of negative 11 at 0.9 megapascals, and 5 times 10 to the power of negative 11 at 1.1 megapascals. Measurements remain below the model across the pressure range.Comparison of the measurement data of the current density in SF6 from Zavattoni (2014) with the electrical conductivity model (12) multiplied with kV/mm to obtain the resulting current density with respect to the gas pressure P
Source: Authors’ own work