Frontiers in Physics (May 2022)
Study on the Insulation Performance of SF6 Gas Under Different Environmental Factors
Abstract
During the long-term operation of electrical equipment, the insulation performance of applied SF6 gas may be affected by humidity, pressure, and temperature. In this study, the collision cross sections of SF6 and H2O are considered, including ionization, attachment, excitation, and elastic collision. In order to analyze the influencing factors of SF6 insulation performance, discharge parameters are computed by the Boltzmann equation under different environmental conditions, including humidity, pressure, and temperature. It is concluded that with the conditions of 0.1 MPa and 300 K, the critical breakdown electric field increases by 1.23 kV/cm as the relative humidity increases from 0% to 80%. As the pressure increases from 0.1 to 0.6 MPa, the critical breakdown electric field increases by 451.07 kV/cm. However, temperature also has little effect on the insulation performance of SF6 gas. The conclusions of this study have reference value for safe and stable operation of SF6 insulated power equipment.
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