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Two hydro generators were chosen to renew the stator winding. The motivation of this investment was an expertise about the condition of the generators. Beside technical diagnosis the operational dates and maintenance history was taken into account as well as the age of these generators. The stator windings were replaced with an insulation system that had the benefit of a 10 % power increase. The aged...
Partial discharge (PD) is one of key factors which lead to premature failure of inverter-fed motors. It is proved that characteristic parameters of PD can be used to evaluate life of insulation material effectively under alternating current (AC). In this paper, some parameters of PD are statistically based on measurement results. Influence of impulse frequency on inception voltage of PD (PDIV), mean...
AC breakdowns are commonly used as a performance indicator for power cables, and yet the data generated can be misinterpreted if the test section of cable is found to have a manufacturing defect. As an example, in a recent publication, dielectric a breakdown value on a 17-year field aged cable was treated as a "suspension" by the authors after the discovery of a conductor shield skip at...
This paper describes the first results from experimental investigations which have been carried out to study the partial discharge phenomena in power transformer insulation. Using different types of modeled insulation defects and ageing tests it is aimed to organize a database of known defects, which will be used for recognition of discharges of unknown sources of defects. Moreover, the first results...
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