In order to evaluate the insulation of two-phase immersion cooling in the HV power electronic package. the insulation degradation of the dielectric interface induced by bubbles is investigated. In this paper. a test strategy with 50 Hz unipolar DC and AC combined voltage for partial discharge (PD) at boiling interface of AIN ceramic is proposed. https://www.hindigyanvishv.com/deal-time-Universal-Steering-Wheel-Control-Input-Interface-APUNISW2-hot-grab/