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Measurements of Dissipation Factor (tanδ/Δtanδ), Polarization Index (PI) and DC High Potential Insulation Currents are widely used diagnostic tools to assess the condition of stator insulation in hydro generators. This paper presents long-term diagnostic data gathered from three 60 MVA generators in a Swiss hydropower station. The measurements were performed in 5-year intervals as part of regular...
Different stator winding types of multi-branch generator lead to different internal short circuit fault aggregation, and the main protection scheme research must base on this fault aggregation to educe the optimized branch grouping style on neutral side and the main protection configuration principles. The paper analyzed the stator winding type and internal short circuit faults of 250 MW generator...
Variable speed hydro power plants allow to compensate and to smooth the fluctuating wind power when feeding isolated loads. This is shown experimentally in this paper with the help of a 3 kW laboratory test bench able to emulate a hybrid wind/hydro power system. The test bench is equipped of a doubly fed induction generator based small hydro power plant emulator associated with a fixed-speed wind...
Mini hydropower and wind power plants have a promising future in Poland. Variable speed cascaded induction generators could be an attractive alternative to conventional double output induction generators habitually applied in mini hydropower stations. Cascaded induction generators require lower maintenance due the absence of slip rings and brushes. Unidirectional power converters can be employed in...
Hydroelectric generation is the largest contemporary source of commercially viable renewable energy produced on a large scale. Most of the Australian hydro generating plants are 40 to 60 years old and approaching their ldquohalf liferdquo refurbishment. Uprating of existing generously sized generators is, in most cases, possible and is the easiest and cheapest way of obtaining extra generating capacity...
Most small or medium waterpower generation stations are multi-generator-systems (MGS) with more than one generator directly connecting a bus. A novel selectivity protection for generator stator grounding faults in the MGS is proposed in the paper. The third harmonic currents of each phase are measured in generator neutral points and generator terminals respectively. The third harmonic leaking current...
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