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Zlatanovici D.,ICEMENERG Bucharest | Ionescu F.,Polytechnic University of Bucharest | Herisanu A.,Branch HIDROELECTRICA Curtea de Arges | Cicirone C.,ICEMENERG Bucharest
2013 - 8th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2013 | Year: 2013

The paper presents a mathematical model and a computer program for determining the time constants amplification coefficients and parameters of the automatic voltage regulator (AVR). Essentially the method consists of simulating the application of the step type perturbation a perturbation at the input stage AVR and determine its parameters. Further experimental tests were performed on the hydrogenerator from hydroelectric power Lereşti-Arges, using the same method, applying to live a step type pertubation at the input stage AVR and the same parameters were determined. Finally, compare the results experimental and values required by international standards. © 2013 IEEE.

Herisanu A.,HIDROELECTRICA SH | Cicirone C.,ICEMENERG Bucharest | Dumitrescu S.,ICEMENERG Bucharest | Zlatanovici D.,ICEMENERG Bucharest
UPB Scientific Bulletin, Series C: Electrical Engineering | Year: 2013

The paper presents an original method in live determination of the main parameters of the automatic voltage regulator of hydro generators. The proposed method can be used for any kind of AVR and excitation system. The proposed method consists in simulating voltage variations on the reaction channel of AVR and recording its response in its size while the generator is still connected to the grid. The technique of measuring is based on using virtual instrumentation. The sampling rate for recording quantities is 0.2 ms. In the end it is presented an exemplification of measurement result to a 5.75 MW hydro generator with DC excitation generator and a 19.51 MW hydro generator with rotating diodes excitation and digital AVR.

Zlatanovici R.,ICEMENERG Bucharest | Zlatanovici D.,ICEMENERG Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2013

The detection of the electric generator stator core faults is traditionally performed by high flux density testing which consists in introducing a magnetic flux density of about 1.0-1.5 T into the core and measuring the temperature. The low flux density iron core test consists in introducing a low flux density of 0.2-0.3 T and the determination of the eddy currents produced by possible fault. The paper describes this method, presents the theoretical basis and the evaluation criteria. Further, a comparison between the two cases is made based on an actual case by means of the two methods, the high and low flux density one. Finally, the results of the measurements of several hydro and turbo generators are presented.

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