Abstract

TORRES, William; DORRBERCKER, Santiago  and  BENITEZ, Ivón. VARIABLE FOR THE SUPERVISION OF AGING MAIN INSULATION OF LARGE HYDROGENERATORS THROUGH PARTIAL DISCHARGES. uct [online]. 2010, vol.14, n.56, pp.165-173. ISSN 1316-4821.

The aging of the main insulation of large hydrogenerators is one of the root causes of failure of greater consideration of these machines, additionally; the use of the technique of the partial discharges (PD) for the evaluation of the degradation condition has constituted an objective looked for but even with unsatisfactory results. In this article a new state variable ZDP for the supervision of the aging of the system of insulation of the stator of the powerful hydrogenerators. The aspect most important of ZDP is the robustness, that is, ability to display minimum variations as a function of testing conditions and identification capability, which is the attitude of an indicator to be specific for a certain kind of defect. The research was developed on experimental base insulation systems which cover all known commercial versions and are distributed as follows: mica-asphalt insulation (6 generators), polyester-mica insulation (3 generators) and mica-epoxy insulation (43 generators). In synthesis, the results of the application of the new variable with other parameters of effective traditional use for the supervision of the aging through PD, thus demonstrating the effectiveness of ZDP are compared.

Keywords : Partial Discharges; Hydrogenerators; Main Insulation; Supervision of the Aging; State Variable.