The effect of temperature and the mutual influence between two cavities on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage

摘要

Our work treats the effect of the temperature on the appearance of partial discharges in high voltage cables. We modelize the heterogeneous insulator of the cable using finite difference method. The numerical treatment is carried out in bidimensional due to the observed symmetry in the cavities. We simulate regions of weak concentration to an insulator containing one cavity, this is justified by the absence of interactions between cavities. The regions of great concentrations are simulated to an insulator, which contain two cavities in mutual interactions. Once the two cavities are in contact, we speak then of a complex defect called "bi-vacuole". The physical proprieties to simulate are the electrical field and the temperature. We present the results of computation obtained by an established program, this result show that the partial discharge is occurred in cavities of small diameters in regions either near the core or the wrapping. The mutual interaction between cavities contributes much the apparition of the partial discharges.