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A methodology for obtaining by measurements the transformer physical-circuital model parameters

100%

Aponte G. , Cadavid H. , Burgos J. C. , Gomez E.

Przegląd Elektrotechniczny

2012

tom R. 88, nr 9a

12-15

Modeling a transformer usually requires all its construction data, which is very difficult to obtain for the units in operation; for new transformers manufacturers are not usually willing to provide this information. This paper presents a procedure to obtain the parameters of the transformer physical-circuital model based on data obtained from external measurements, without need for design data. This was done by using different tests, some routine tests like losses and other special tests such as frequency response or FRA. It is also presented the application of the procedure to obtain the model of a 15-KVA 13200 / 244 V single-phase transformer, and its use to simulate the frequency response.

W artykule zaprezentowano procedurę określania parametrów modelu transformatora na podstawie pomiarowych danych eksperymentalnych. Przedstawiono przykłady testów rutynowych jak i specjalnych. Uzyskane wyniki sprawdzono na przykładzie transformatora 15- KVA 13200/244 V.

Determining kinetic constants and transport efficiencies at membrane interfaces to optimize the removal/recovery of cu(II) through lulk liquid membranes containing benzoylacetone as carrier

88%

Leon G. , Hidalgo A. M. , Murcia M. D. , Miguel B. , Gomez E.

Polish Journal of Environmental Studies

2017

tom 26

nr 6

The removal, separation, and enrichment of heavy metals in aqueous solutions has become a prime concern over the last few decades because of both their adverse effects on the ecosystem and living organisms and their valuable resource character. This paper describes a study to optimize the simultaneous removal/ recovery of Cu(II) from aqueous solutions by bulk liquid membranes, through a facilitated countertransport mechanism using benzoylacetone as a mobile carrier and hydrochloric acid as a stripping agent (protons as counter ions), by analyzing the effect of different operational variables (carrier concentration in membrane phase, stripping agent concentration in product phase, stirring rate, and membrane phase volume) on the removal/recovery kinetics constants and on the transport efficiencies through the feed/membrane and membrane/product interfaces.

Low serum concentration in bovine embryo culture enhances early blastocyst rates on Day-6 with quality traits in the expanded blastocyst stage similar to BSA-cultured embryos

75%

Murillo A. , Munoz M. , Martin-Gonzalez D. , Carrocera S. , Martínez-Nistal A. , Gomez E.

Reproductive Biology

2017

tom 17

nr 2