This paper proposes a nonlinear electromagnetic-thermal-velocity coupling model to study the insulation performance of converter transformer. in which the saddle-like electric-stress dependence is considered under compound alternating current-direct current (AC-DC) voltage situation. Firstly. the conductance of transformer oil and oil-immersed pressboard have been measured through con... https://parisnaturalfoodes.shop/product-category/daily-face-moisturizer/