Which process is commonly used to enhance electrical insulation resistance?

The process commonly used to enhance electrical insulation resistance is dewatering. Insulation materials, particularly those that are organic, can absorb moisture over time, which negatively impacts their insulating properties. By removing moisture through dewatering techniques, the insulation's resistance to electrical current can be significantly improved. This increases the reliability and safety of electrical systems, as the presence of moisture can lead to increased leakage currents and potential failure of the insulation.

While heating, aging, and washing with solvents might have their roles in particular scenarios for maintenance or preparation of electrical devices, they may not directly address the insulation's moisture content. Heating can dry materials but does not specifically target moisture removal like dewatering does. Aging can lead to a natural breakdown of insulation over time rather than enhancing its properties. Washing with solvents may clean the surface but typically will not address moisture trapped within the insulation. Thus, dewatering stands out as the most effective process for improving electrical insulation resistance.