Solid-solid interfaces e.g., in cable accessories are important to achieve a necessary dielectric performance. However, within the sealing, the possibility of voids and cracks is not completely avoidable and needs to be focused. Such imperfect dielectric tightness at the interfaces increases localized electric field leading to partial discharges and subsequent breakdown process. Herein, we report, enhancement in electrical interface strength by using controlled structural features (Wrinkles) on the surface of longitudinal interface materials. Electric field simulations were done on these structures using different positioning of electrodes concerning the wrinkle shape. In addition, the trajectory of electron given by the wrinkle shape towards the high voltage electrode is measured along with ionization coefficient responsible for the avalanche mechanism.