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Possibility for storing electrical energy in any significant quantity is very limited. Measurement and evaluation of the quality of the supplied Voltage (power) has to be made at the instant of its consumption. Power Quality analysis, monitoring and assessment is a very complex task, since the supplier and user, whose sensitive electrical equipment is also a source of disturbances, have different perspectives.

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It is well known that the paperoil insulation is so prepared, that the paper installed in the high voltage apparatus is first dried up with the influence of high vacuum and elevated temperature. Then, under vacuum the paper is impregnated with oil. Sometimes, the high voltage apparatus with oilpaper insulation, after a short period under working conditions loses his good dielectric properties because of high content of moisture. This is mostly because of penetration of atmospheric water in the apparatus. Now, it is interesting to know if there is possible to dry such an apparatus and how. In this paper we describe the experiments carried out on a model of the oil paper insulation with high water content in the paper. The insulation is dried up with influence of high vacuum and elevated temperature during some time. The results show that such drying on a model is possible. The needed vacuum, temperature and time for drying the model are presented and discussed. The experiments on real apparatus are planned, but not presented in this paper.