Study on the Mechanism of External Electric Field on Insulating Oil of Power Capacitors Based on Molecular Simulation
Benzyl toluene is the preferred liquid medium for power capacitors due to its good physical and electrical properties.In study,the molecular model of benzyl toluene was constructed,and the molecular simulation method was used to study the effect of external electric field on the microscopic mechanism of benzyl toluene insulating oil.The results show that the increase in the strength of the external electric field leads to a decrease in the total of the benzyl toluene molecules,and an increase in their dipole moment and polarizability,which decreases molecular stability.Meanwhile,when stretched by external electric field,the benzyl toluene molecular chain will elongate,thereby reducing geometric structural stability and affecting electrical performance.Under higher external electric field strengths the energy gap between the frontier orbitals of the benzyl toluene molecules decreases,leading to an increase in molecular reactivity.When encountering extreme field strengths the molecular structure of benzyl toluene will be destroyed,resulting in significant changes in the infrared spectrum.These findings provide theoretical support for material modification directions,-voltage breakdown tests,and insulation condition assessment.
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