Effect of Temperature on Breakdown Voltage and on the Electrical Behavior of a Hydrofluoroether

The ability to design electrohydrodynamic systems with minimal risk of breakdown is essential for having a higher security level of performance. In order to achieve this goal, the dielectric strength of the operating liquid must not be reached. In addition to that, it is important to investigate the current-voltage characteristics of the working liquid to have a better understanding of the system's response. Therefore, this work has two main objectives: to investigate the temperature effect on the dielectric strength of Hydrofluoroether 7100, and to study the electric behavior of this same liquid under high electric fields at different temperatures. Results show that the breakdown voltage increases with temperature. The inter-electrode distance seems to have a greater influence on the breakdown voltage at high temperatures than at low temperatures. Temperature also proved to have an important effect on the shape of the current-voltage curves. The injection zone's threshold increases with temperature. This zone is more pronounced for temperatures lower than 25°C.